Re: [PATCH V4 2/2] riscv: board: Support OpenPiton SoC

[Tianrui Wei]

On 5/7/2021 11:41 AM, Sean Anderson wrote:
On 5/6/21 11:28 PM, Tianrui Wei wrote:

On 5/7/2021 11:15 AM, Sean Anderson wrote:
On 5/6/21 11:06 PM, Tianrui Wei wrote:
Hi Sean,


Many thanks again for reviewing our code! We really appreciate it. 
Will fix the things you're suggesting ;p Though I have a few 
questions in line in the comment. Also, checkpatch didn't catch any 
of the identation issues. I was wondering if there are some 
specific flags to enable some of the checks? I'm running 
./utils/checkpatch.pl this.patch right now.


On 5/7/2021 10:32 AM, Sean Anderson wrote:
On 5/5/21 11:42 PM, Tianrui Wei wrote:
From: Tianrui Wei <tianrui-...@outlook.com>
Date: Thu, 6 May 2021 11:30:20 +0800
Subject: [PATCH V4 2/2] riscv: board: Support OpenPiton SoC

This patch add board support for OpenPiton.

Please add some information to the commit message describing the 
board.


Signed-off-by: Tianrui Wei <tianrui-...@outlook.com>
Signed-off-by: Jonathan Balkind <jbalk...@ucsb.edu>
---

  arch/riscv/Kconfig                      |   4 +
  arch/riscv/dts/Makefile                 |   1 +
  arch/riscv/dts/openpiton-riscv64.dts    | 159 +++++
  board/openpiton/riscv/Kconfig           |  42 ++
  board/openpiton/riscv/MAINTAINERS       |   6 +
  board/openpiton/riscv/Makefile          |   5 +
  board/openpiton/riscv/openpiton-riscv.c |  41 ++
  configs/openpiton_riscv64_defconfig     | 132 ++++
  doc/board/index.rst                     |   1 +
  doc/board/openpiton/index.rst           |   9 +
  doc/board/openpiton/riscv64.rst         | 885 
++++++++++++++++++++++++
  include/configs/openpiton-riscv.h       |  58 ++
  12 files changed, 1343 insertions(+)
  create mode 100644 arch/riscv/dts/openpiton-riscv64.dts
  create mode 100644 board/openpiton/riscv/Kconfig
  create mode 100644 board/openpiton/riscv/MAINTAINERS
  create mode 100644 board/openpiton/riscv/Makefile
  create mode 100644 board/openpiton/riscv/openpiton-riscv.c
  create mode 100644 configs/openpiton_riscv64_defconfig
  create mode 100644 doc/board/openpiton/index.rst
  create mode 100644 doc/board/openpiton/riscv64.rst
  create mode 100644 include/configs/openpiton-riscv.h

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 30b05408..9e7deb34 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -23,6 +23,9 @@ config TARGET_SIFIVE_FU540
  config TARGET_SIPEED_MAIX
      bool "Support Sipeed Maix Board"
  +config TARGET_OPENPITON_RISCV
+  bool "Support riscv cores on openpiton SoC"
+
  endchoice
    config SYS_ICACHE_OFF
@@ -55,6 +58,7 @@ config SPL_SYS_DCACHE_OFF
  source "board/AndesTech/ax25-ae350/Kconfig"
  source "board/emulation/qemu-riscv/Kconfig"
  source "board/microchip/mpfs_icicle/Kconfig"
+source "board/openpiton/riscv/Kconfig"

Fix indentation.


It shows correct formatting in my client, and there's no warning in 
checkpatch for some reason

Ignore this, sorry.




  source "board/sifive/fu540/Kconfig"
  source "board/sipeed/maix/Kconfig"
  diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
index 3a6f96c6..b511cd74 100644
--- a/arch/riscv/dts/Makefile
+++ b/arch/riscv/dts/Makefile
@@ -1,6 +1,7 @@
  # SPDX-License-Identifier: GPL-2.0+
    dtb-$(CONFIG_TARGET_AX25_AE350) += ae350_32.dtb ae350_64.dtb
+dtb-$(CONFIG_TARGET_OPENPITON_RISCV) += openpiton-riscv64.dtb
  dtb-$(CONFIG_TARGET_SIFIVE_FU540) += hifive-unleashed-a00.dtb
  dtb-$(CONFIG_TARGET_SIPEED_MAIX) += k210-maix-bit.dtb
  diff --git a/arch/riscv/dts/openpiton-riscv64.dts 
b/arch/riscv/dts/openpiton-riscv64.dts
new file mode 100644
index 00000000..ce732b92
--- /dev/null
+++ b/arch/riscv/dts/openpiton-riscv64.dts
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/* Copyright (c) 2021 Tianrui Wei <tianrui-...@outlook.com> */
+
+/*
+ * This dts is for a dual core instance of OpenPiton+Ariane built
+ * to run on a Digilent Genesys 2 FPGA at 66.67MHz. These files
+ * are automatically generated by the OpenPiton build system and
+ * this configuration may not be what you need if your 
configuration
+ * is different from the below.
+ */
+
+/dts-v1/;
+
+/ {
+    #address-cells = <2>;
+    #size-cells = <2>;
+    u-boot,dm-pre-reloc;
+    compatible = "openpiton,ariane";
+
+    chosen {
+       stdout-path = "uart0:115200";
+    };
+
+    aliases {
+        console = &uart0;
+        serial0 = &uart0;
+    };
+
+    cpus {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        u-boot,dm-pre-reloc;

This is unnecessary since riscv_cpu has DM_FLAG_PRE_RELOC.

+        timebase-frequency = <520835>;
+
+        CPU0: cpu@0 {
+            clock-frequency = <66667000>;

Please add a clocks node. If you just have one clock for the whole 
soc,
you can always use a fixed-clock binding.

+            u-boot,dm-pre-reloc;
+            device_type = "cpu";
+            reg = <0>;
+            status = "okay";
+            compatible = "eth, ariane", "riscv";

There should be no space after the comma. And what is "eth"? 
Should this
be lowrisc?


Oh eth was ETH Zurich, who developed ariane riscv64 CPU.



+            riscv,isa = "rv64imafdc";
+            mmu-type = "riscv,sv39";
+            tlb-split;
+            // HLIC - hart local interrupt controller
+            CPU0_intc: interrupt-controller {
+                #interrupt-cells = <1>;
+                interrupt-controller;
+                compatible = "riscv,cpu-intc";
+            };
+        };
+
+        CPU1: cpu@1 {

Same comments as above.

+            clock-frequency = <66667000>;
+            u-boot,dm-pre-reloc;
+            device_type = "cpu";
+            reg = <1>;
+            status = "okay";
+            compatible = "eth, ariane", "riscv";
+            riscv,isa = "rv64imafdc";
+            mmu-type = "riscv,sv39";
+            tlb-split;
+            // HLIC - hart local interrupt controller
+            CPU1_intc: interrupt-controller {
+                #interrupt-cells = <1>;
+                interrupt-controller;
+                compatible = "riscv,cpu-intc";
+            };
+        };
+
+    };
+
+    memory@80000000 {
+        u-boot,dm-pre-reloc;
+        device_type = "memory";
+        reg = < 0x00000000 0x80000000 0x00000000 0x40000000 >;
+    };
+

Everything below this line should be under a soc node.


Will do



+    uart0: uart@fff0c2c000 {
+        u-boot,dm-pre-reloc;

This is unnecessary. ns16550_serial has DM_FLAG_PRE_RELOC.

+        compatible = "ns16550";
+        reg = < 0x000000ff 0xf0c2c000 0x00000000 0x000d4000 >;
+        clock-frequency = <66667000>;

Please add a clocks 
node.Documentation/devicetree/bindings/serial/serial.yaml

+        current-speed = <115200>;

This is only necessary if the baud rate cannot otherwise be 
determined.
Please remove this.


Oh this was necessary to hard code

Why is that? It should be possible to determine the current baud rate
from the input clock and the divider.


That makes sense, will do.






+        interrupt-parent = <&PLIC0>;

Please specify this under /soc.

+        interrupts = <1>;
+        reg-shift = <0>;
+        // regs are spaced on 8 bit boundary
+    };
+
+    eth: ethernet@fff0d00000 {
+        compatible = "xlnx,xps-ethernetlite-1.00.a";
+        device_type = "network";
+        reg = < 0x000000ff 0xf0d00000 0x00000000 0x00100000 >;
+        interrupt-parent = <&PLIC0>;
+        interrupts = <2>;
+        local-mac-address = [ 00 18 3E 02 E3 E5 ];
+        phy-handle = <&phy0>;
+        xlnx,duplex = <0x1>;
+        xlnx,include-global-buffers = <0x1>;
+        xlnx,include-internal-loopback = <0x0>;
+        xlnx,include-mdio = <0x1>;
+        xlnx,rx-ping-pong = <0x1>;
+        xlnx,s-axi-id-width = <0x1>;
+        xlnx,tx-ping-pong = <0x1>;
+        xlnx,use-internal = <0x0>;
+        axi_ethernetlite_0_mdio: mdio {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            phy0: phy@1 {
+                compatible = "ethernet-phy-id001C.C915";
+                device_type = "ethernet-phy";
+                reg = <1>;
+            };
+        };
+    };
+
+    debug-controller@fff1000000 {
+        compatible = "riscv,debug-013";

Is this binding needed? Will U-Boot/Linux/whoever need to initialize
this device?


I think

Well, for the moment there is no driver for this in U-Boot or Linux.


Oh then I must be mistaken, will remove.






+        interrupts-extended = < &CPU0_intc 65535
+                                &CPU1_intc 65535 >;

Please align these.

+        reg = < 0x000000ff 0xf1000000 0x00000000 0x00001000 >;
+        reg-names = "control";
+    };
+
+    sdhci_0: sdhci@0xf000000000 {

No 0x prefix please.

+        u-boot,dm-pre-reloc;

Why does this need to be pre-reloc?


We're using it in SPL

Then please use u-boot,dm-spl


Will do






+        status = "okay";
+        compatible = "openpiton,piton-mmc";
+        reg = < 0x000000f0 0x00000000 0x00000000 0x00300000 >;
+    };

Missing newline.

+    clint@fff1020000 {
+        u-boot,dm-pre-reloc;

Again, unnecessary since the driver has the flag set.

+        compatible = "sifive,clint0";
+        interrupts-extended = < &CPU0_intc 3
+                                &CPU0_intc 7
+                                &CPU1_intc 3
+                                &CPU1_intc 7 >;

Please align this.

+        reg = < 0x000000ff 0xf1020000 0x00000000 0x000c0000 >;
+        reg-names = "control";

Please add a clocks property.

+    };
+
+    PLIC0: plic@fff1100000 {
+        u-boot,dm-pre-reloc;

Again, unnecessary.

+        #address-cells = <0>;

Remove this.

+        #interrupt-cells = <1>;
+        compatible = "sifive,plic-1.0.0";
+        interrupt-controller;
+        interrupts-extended = < &CPU0_intc 11
+                                &CPU0_intc 9
+                                &CPU1_intc 11
+                                &CPU1_intc 9 >;

Align these please.

+        reg = < 0x000000ff 0xf1100000 0x00000000 0x04000000 >;
+        riscv,max-priority = <7>;
+        riscv,ndev = <2>;
+    };

In general, please add soc-specific compatible strings (e.g.
"openpiton,ns16550") to allow for forward compatibility.

+
+};
+
diff --git a/board/openpiton/riscv/Kconfig 
b/board/openpiton/riscv/Kconfig
new file mode 100644
index 00000000..31ae44d5
--- /dev/null
+++ b/board/openpiton/riscv/Kconfig
@@ -0,0 +1,42 @@
+if TARGET_OPENPITON_RISCV
+
+config SYS_BOARD
+    default "riscv"
+
+config SYS_VENDOR
+    default "openpiton"
+
+config SYS_CPU
+    default "generic"
+
+config SYS_CONFIG_NAME
+    default "openpiton-riscv"
+
+config SYS_TEXT_BASE
+    default 0x81000000 if SPL
+    default 0x80000000 if !RISCV_SMODE
+    default 0x81000000 if RISCV_SMODE
+
+config SPL_TEXT_BASE
+    default 0x80000000
+
+config SPL_OPENSBI_LOAD_ADDR
+    default 0x81000000
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+    def_bool y
+    select ARCH_EARLY_INIT_R
+    select SUPPORT_SPL
+    imply CPU_RISCV
+    imply RISCV_TIMER if (RISCV_SMODE || SPL_RISCV_SMODE)
+    imply SIFIVE_CLINT if (RISCV_MMODE || SPL_RISCV_MMODE)
+    imply CMD_CPU
+    imply SPL_CPU_SUPPORT
+    imply SPL_OPENSBI
+    imply SPL_LOAD_FIT
+    imply SPL_SMP
+    imply SPL_MMC

Fix indentation please. Did you run checkpatch?

+    imply SMP
+    imply SPL_RISCV_MMODE
+
+endif
diff --git a/board/openpiton/riscv/MAINTAINERS 
b/board/openpiton/riscv/MAINTAINERS
new file mode 100644
index 00000000..1db6fb60
--- /dev/null
+++ b/board/openpiton/riscv/MAINTAINERS
@@ -0,0 +1,6 @@
+Openpiton Riscv Bootloader

OpenPiton BOARD

+M:    Tianrui Wei<tianrui-...@outlook.com>
+S:    Maintained
+F:    board/openpiton/riscv/

Will there be non-riscv openpiton boards?

In general, the directory layout here is

board/manufacturer/board_name

So who manufactures OpenPiton?


There will probably be, yes.


OpenPiton is a community project, and will continue to support 
other isas in the future ( already a few other supported now )



+F: include/configs/openpiton-riscv.h
+F:    configs/openpiton_riscv_defconfig
diff --git a/board/openpiton/riscv/Makefile 
b/board/openpiton/riscv/Makefile
new file mode 100644
index 00000000..8cc20e7c
--- /dev/null
+++ b/board/openpiton/riscv/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2021 Tianrui Wei
+# Tianrui Wei <tianrui-...@outlook.com>
+obj-y += openpiton-riscv.o
diff --git a/board/openpiton/riscv/openpiton-riscv.c 
b/board/openpiton/riscv/openpiton-riscv.c
new file mode 100644
index 00000000..5be407e7
--- /dev/null
+++ b/board/openpiton/riscv/openpiton-riscv.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2019 SiFive, Inc
+ * Copyright (c) 2021 Tianrui Wei
+ *
+ *
+ * Authors:
+ *   Pragnesh Patel <pragnesh.pa...@sifive.com>
+ *   Tianrui Wei <tianrui-...@outlook.com>
+ */
+#include <common.h>
+#include <init.h>
+#include <configs/openpiton-riscv.h>
+#include <dm.h>
+#include <spl.h>
+
+#ifdef CONFIG_SPL
+void board_boot_order(u32 *spl_boot_list)
+{
+    u8 i;
+    u32 boot_devices[] = {
+        BOOT_DEVICE_MMC1,
+    };
+
+    for (i = 0; i < ARRAY_SIZE(boot_devices); i++)
+        spl_boot_list[i] = boot_devices[i];
+}
+#endif
+
+#ifdef CONFIG_SPL_LOAD_FIT
+int board_fit_config_name_match(const char *name)
+{
+    /* boot using first FIT config */
+    return 0;
+}
+#endif
+
+int board_init(void)
+{
+        return 0;
+}

Do you need get_effective_memsize?

diff --git a/configs/openpiton_riscv64_defconfig 
b/configs/openpiton_riscv64_defconfig
new file mode 100644
index 00000000..37aa3c80
--- /dev/null
+++ b/configs/openpiton_riscv64_defconfig
@@ -0,0 +1,132 @@
+CONFIG_RISCV=y
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_SPL=y
+CONFIG_SPL_MMC_SUPPORT=y
+CONFIG_DEFAULT_DEVICE_TREE="openpiton-riscv64"
+CONFIG_TARGET_OPENPITON_RISCV=y
+CONFIG_ARCH_RV64I=y
+CONFIG_RISCV_SMODE=y
+CONFIG_MISC_INIT_R=n
+CONFIG_SYS_MALLOC_F_LEN=0x1000
+CONFIG_SPL_SYS_MALLOC_F_LEN=0x100000
+CONFIG_SPL_PAYLOAD=""
+CONFIG_LIBDISK_SUPPORT=y
+CONFIG_NR_CPUS=32
+CONFIG_CMODEL_MEDANY=y
+CONFIG_EXPORT=n
+CONFIG_HASH=n
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
+CONFIG_SPL_BANNER_PRINT=n
+CONFIG_SPL_CRC32_SUPPORT=n
+CONFIG_GENERATE_SMBIOS_TABLE=n
+CONFIG_EFI_LOADER=n
+CONFIG_LIB_DATA=y
+CONFIG_SPL_USE_TINY_PRINTF=y
+CONFIG_SPL_TINY_MEMSET=y
+CONFIG_FS_EXT4=y
+CONFIG_DM_RTC=y
+CONFIG_SYS_NS16550=y
+CONFIG_SPL_OPENSBI=n
+CONFIG_SPL_RTC_SUPPORT=y
+CONFIG_SPL_FS_EXT4=y
+CONFIG_SPL_LEGACY_IMAGE_SUPPORT=n
+CONFIG_CMD_NET=n
+CONFIG_EFI_PARTITION=y
+CONFIG_EFI_PARTITION_ENTRIES_NUMBERS=128
+CONFIG_EFI_PARTITION_ENTRIES_OFF=0
+CONFIG_SPL_EFI_PARTITION=y
+CONFIG_PARTITION_UUIDS=y
+CONFIG_OF_EMBED=y

This is not allowed for mainline boards. Please use OF_SEPARATE (for
M-mode) or OF_PRIOR_STAGE (for S-mode).


Interesting. Does it work for SPL also?



+CONFIG_HAVE_BLOCK_DEVICE=y
+CONFIG_CPU=y
+CONFIG_CPU_RISCV=y
+CONFIG_MMC=y
+CONFIG_DM_MMC=y
+CONFIG_SPL_DM_MMC=y
+CONFIG_MMC_PITON=y
+CONFIG_MMC_QUIRKS=y
+CONFIG_DEBUG_UART=y
+CONFIG_DEBUG_UART_NS16550=y
+CONFIG_DEBUG_UART_SHIFT=0
+CONFIG_DEBUG_UART_ANNOUNCE=y
+CONFIG_DEBUG_UART_SKIP_INIT=y
+CONFIG_DEBUG_UART_BASE=0xfff0c2c000
+CONFIG_DEBUG_UART_CLOCK=66667000
+CONFIG_SPL_LIBDISK_SUPPORT=y
+CONFIG_MMC_VERBOSE=n
+CONFIG_MMC_WRITE=n
+CONFIG_MMC_HW_PARTITIONING=n
+CONFIG_SYS_RELOC_GD_ENV_ADDR=n
+CONFIG_SAVEENV=n
+CONFIG_NET=n
+CONFIG_SPL_PARTITION_UUIDS=n
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_FS_GENERIC=y
+CONFIG_CMD_READ=y
+CONFIG_CMD_LSBLK=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_GPT=y
+CONFIG_CMD_MEMINFO=y
+CONFIG_EXPERT=n
+CONFIG_ENV_VARS_UBOOT_CONFIG=y
+CONFIG_LEGACY_IMAGE_FORMAT=n
+CONFIG_ARCH_FIXUP_FDT_MEMORY=n
+CONFIG_MENU=y
+CONFIG_CMD_BOOTZ=y
+CONFIG_CMD_PART=y
+CONFIG_SHOW_REGS=y
+CONFIG_LOG=y
+CONFIG_LOGLEVEL=9
+CONFIG_SPL_LOGLEVEL=9
+CONFIG_TPL_LOGLEVEL=9
+CONFIG_SPL_LOG=y
+CONFIG_SPL_LOG_MAX_LEVEL=9
+CONFIG_SPL_LOG_CONSOLE=y
+CONFIG_LOG_ERROR_RETURN=y
+CONFIG_CMD_CPU=n
+CONFIG_BOOTM_NETBSD=n
+CONFIG_BOOTM_PLAN9=n
+CONFIG_BOOTM_RTEMS=n
+CONFIG_BOOTM_VXWORKS=n
+CONFIG_CMD_RUN=n
+CONFIG_CMD_IMI=n
+CONFIG_CMD_XIMG=n
+CONFIG_CMD_EXPORTENV=n
+CONFIG_CMD_IMPORTENV=n
+CONFIG_CMD_EDITENV=n
+CONFIG_CMD_SAVEENV=n
+CONFIG_CMD_CRC32=n
+CONFIG_CMD_RANDOM=n
+CONFIG_CMD_LZMADEC=n
+CONFIG_CMD_UNLZ4=n
+CONFIG_CMD_UNZIP=n
+CONFIG_CMD_FLASH=n
+CONFIG_RANDOM_UUID=n
+CONFIG_CMD_LOADB=n
+CONFIG_CMD_LOADS=n
+CONFIG_CMD_ECHO=n
+CONFIG_CMD_ITEST=n
+CONFIG_CMD_SOURCE=n
+CONFIG_CMD_SETEXPR=n
+CONFIG_CMD_BLOCK_CACHE=n
+CONFIG_CMD_DATE=n
+CONFIG_CMD_SLEEP=n
+CONFIG_CMD_SYSBOOT=y
+CONFIG_CMD_FAT=y
+CONFIG_DOS_PARTITION=y
+CONFIG_ISO_PARTITION=y
+CONFIG_DM_ETH=y
+CONFIG_RAM=y
+CONFIG_SPL_RAM=y
+CONFIG_FS_FAT=y
+CONFIG_FS_FAT_MAX_CLUSTSIZE=65536
+CONFIG_FS_SQUASHFS=y
+CONFIG_SHA1=y
+CONFIG_SHA256=y
+CONFIG_MD5=y
+CONFIG_ZLIB_UNCOMPRESS=y
+CONFIG_SPL_GZIP=y
+CONFIG_SPL_ZLIB=y
+CONFIG_GETOPT=y
+CONFIG_OF_LIBFDT_OVERLAY=y
+CONFIG_RAM_SIFIVE=n

Did you generate this with "make savedefconfig"?

diff --git a/doc/board/index.rst b/doc/board/index.rst
index 915f1be8..51e60ac4 100644
--- a/doc/board/index.rst
+++ b/doc/board/index.rst
@@ -17,6 +17,7 @@ Board-specific doc
     google/index
     intel/index
     kontron/index
+   openpiton/index

Fix indentation

     renesas/index
     rockchip/index
     sifive/index
diff --git a/doc/board/openpiton/index.rst 
b/doc/board/openpiton/index.rst
new file mode 100644
index 00000000..c469102c
--- /dev/null
+++ b/doc/board/openpiton/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+OpenPiton
+=========
+
+.. toctree::
+   :maxdepth: 2
+
+   riscv64
diff --git a/doc/board/openpiton/riscv64.rst 
b/doc/board/openpiton/riscv64.rst
new file mode 100644
index 00000000..dc934bb4
--- /dev/null
+++ b/doc/board/openpiton/riscv64.rst
@@ -0,0 +1,885 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Openpiton RISC-V SoC
+====================
+
+OpenPiton RISC-V SoC
+--------------------
+OpenPiton is an open source, manycore processor and research 
platform. It is a tiled manycore framework scalable from
one to 1/2 billion cores. It supports a number of ISAs including 
RISC-V with its P-Mesh cache coherence protocol and
networks on chip. It is highly configurable in both core and 
uncore components. OpenPiton has been verified in both ASIC
and multiple Xilinx FPGA prototypes running full-stack Debian linux.
+
+RISCV-V Standard Bootflow
+-------------------------
+Currently, OpenPiton implements RISC-V standard bootflow in the 
following steps
+mover.S -> u-boot-spl -> opensbi -> u-boot -> Linux
+This board supports S-mode u-boot as well as M-mode SPL
+
+Building OpenPition
+---------------------
+If you'd like to build OpenPiton, please go to OpenPiton github 
repo to build from the latest changes

Please link to the github.


Will do



+
+Building Images
+---------------------------
+
+SPL
+---
+
+1. Add the RISC-V toolchain to your PATH.
+2. Setup ARCH & cross compilation environment variable:
+
+.. code-block:: none
+
+   export CROSS_COMPILE=<riscv64 toolchain prefix>
+   export ARCH=riscv
+
+3. make openpiton_riscv64_defconfig
+4. make
+
+U-Boot
+------
+
+1. Add the RISC-V toolchain to your PATH.
+2. Setup ARCH & cross compilation environment variable:
+
+.. code-block:: none
+
+   export CROSS_COMPILE=<riscv64 toolchain prefix>
+   export ARCH=riscv
+
+3. make openpiton_riscv64_defconfig
+4. make menuconfig, then change CONFIG_SYS_TEXT_BASE to 0x81020000

Why isn't this the default?


Because u-boot SPL will just to CONFIG)SYS_TEXT_BASE ( where 
opensbi is ). If I change that, it will just jump to the wrong 
location.

Can you make this dependent on S-Mode?


I'm not sure making it dependent on S-mode helpful, because in 
essense we need to generate u-boot and u-boot spl in 2 passes, so it 
had to be different

U-Boot and SPL should be produced in the same pass. See e.g. SiFive 
Unleashed.


Hmm that's only possible because they're using FIT, whereas we aren't 
though.









+5. make
+
+
+opensbi
+-------
+
+1. Add the RISC-V toolchain to your PATH.
+2. Setup ARCH & cross compilation environment variable:
+
+.. code-block:: none
+
+   export CROSS_COMPILE=<riscv64 toolchain prefix>
+   export ARCH=riscv
+
+3. Go to OpenSBI directory
+4. Edit platform/fpga/openpiton/config.mk, and change 
FW_TEXT_START to 0x81000000
+5. make PLATFORM=fpga/openpiton FW_PAYLOAD_PATH=<path to 
u-boot-nodtb.bin>
+
+
+Using fw_payload.bin with linux
+-------------------------------
+Put the generated fw_payload.bin into the /boot directory on the 
root filesystem, plug in the SD card, then flash the
bitstream. Linux will boot automatically.
+
+Booting
+-------
+Once you plugin the sdcard and power up, you should see the 
U-Boot prompt.
+
+Sample Dual-core Debian boot log from OpenPiton
+-----------------------------------------------
+
+.. code-block:: none
+
+  <debug_uart>

Please use a log without debug uart.


So this is the part where it was a little confusing. Disabling 
debug uart acutally doesn't work for some reason, so we had to keep 
it open. Will submit another patch if we got it working with debug 
uart turned off.

This is a bit of a strange request, but can you try adding some nops()
(around 10-30) to some function (e.g. board_init). I've been having
alignment problems in k210, so it could be something similar.


Hmm that was a good idea. Thanks for the suggestion!




+  spl_early_init
+  Bound device uart@fff0c2c000 to root_driver
+  Bound device sd...@0xf000000000.blk to sdhci@0xf000000000
+  Bound device sdhci@0xf000000000 to root_driver
+  Bound device clint@fff1020000 to root_driver
+  ofnode_read_u32_array: ranges: fdtdec_get_int_array: ranges
+  get_prop_check_min_len: ranges
+  fdtdec_get_addr_size_auto_parent: na=1, ns=0, 
fdtdec_get_addr_size_fixed: reg: addr=00000000x
+  ofnode_read_u32_index: timebase-frequency: (not found)
+  ofnode_read_u32_index: timebase-frequency: x (520835)
+  Bound device riscv_timer to cpu@0
+  Bound device cpu@0 to cpus
+  fdtdec_get_addr_size_auto_parent: na=1, ns=0, 
fdtdec_get_addr_size_fixed: reg: addr=00000000x
+  ofnode_read_u32_index: timebase-frequency: (not found)
+  ofnode_read_u32_index: timebase-frequency: x (520835)
+  Bound device cpu@1 to cpus
+  Bound device cpus to root_driver
+  ofnode_read_prop: riscv,isa: rv64imafdc
+  ofnode_read_prop: riscv,isa: rv64imafdc
+  ofnode_read_u32_index: clock-frequency: (not found)
+  fdtdec_get_addr_size_auto_parent: na=2, ns=2, 
fdtdec_get_addr_size_fixed: reg: addr=00000000x
+  sifive_clint clint@fff1020000: missing clocks or 
clock-frequency property; falling back on timebase-frequency
+  fdtdec_get_addr_size_auto_parent: na=2, ns=2, 
fdtdec_get_addr_size_fixed: reg: addr=00000000x
+  ofnode_read_u32_index: reg: x (0)
+  ofnode_read_u32_index: reg: x (1)
+  fdtdec_get_addr_size_auto_parent: na=2, ns=2, 
fdtdec_get_addr_size_fixed: reg: addr=00000000x
+  ofnode_read_u32_index: reg-offset: (not found)
+  ofnode_read_u32_index: reg-shift: x (0)
+  ofnode_read_u32_index: reg-io-width: (not found)
+  ofnode_read_u32_index: clock-frequency: x (66667000)
+  hello world from uboot spl
+   Class     Index  Probed  Driver                Name
+ -----------------------------------------------------------
+             10s  -2147434144  [  ] 20s root_driver
+             10s  -2147433712  [  ] 20s |-- uart@fff0c2c000
+             10s  -2147433776  [  ] 20s |-- sdhci@0xf000000000
+             10s  -2147433528  [  ] 20s |   `-- 
sd...@0xf000000000.blk
+             10s  -2147433608  [  ] 20s |-- clint@fff1020000
+             10s  -2147434112  [  ] 20s `-- cpus
+             10s  -2147433552  [  ] 20s      |-- cpu@0
+             10s  -2147433608  [  ] 20s      |   `-- riscv_timer
+             10s  -2147433552  [  ] 20s      `-- cpu@1
+  >>SPL: board_init_r()
+  using memory lx-lx for malloc()
+  spl_init
+  Trying to boot from MMC1
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  spl: mmc boot mode: fs
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  GPT: first_usable_lba: X last_usable_lba: X last lba: 22
+  alloc_read_gpt_entries: count = 128 * 128 = 16384
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  part_get_info_efi: start 0x800, size 0x3b71800, name
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  EXT4 features COMPAT: 0000003c INCOMPAT: 00000242 RO_COMPAT: 
0000007b
+  EXT2 rev 1, inode_size 256, descriptor size 32
+  ext4fs read 0 group descriptor (blkno 1 blkoff 0)
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  Iterate dir fw_payload.bin
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  iterate >.<
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  iterate >..<
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  iterate >lost+found<
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  iterate >fw_payload.bin<
+  ext4fs read 1 group descriptor (blkno 1 blkoff 32)
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  mkimage signature not found - ih_magic = 50433
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  Jumping to U-Boot
+  loaded - jumping to U-Boot...
+  image entry point: 0x
+  ofnode_read_u32_index: reg: x (0)
+  ofnode_read_u32_index: reg: x (1)
+
+  OpenSBI v0.9-5-gd06cb61
+     ____                    _____ ____ _____
+    / __ \                  / ____|  _ \_   _|
+   | |  | |_ __   ___ _ __ | (___ | |_) || |
+   | |  | | '_ \ / _ \ '_ \ \___ \|  _ < | |
+   | |__| | |_) |  __/ | | |____) | |_) || |_
+    \____/| .__/ \___|_| |_|_____/|____/_____|
+          | |
+          |_|
+
+  Platform Name             : OPENPITON RISC-V
+  Platform Features         : timer,mfdeleg
+  Platform HART Count       : 3
+  Firmware Base             : 0x81000000
+  Firmware Size             : 104 KB
+  Runtime SBI Version       : 0.2
+
+  Domain0 Name              : root
+  Domain0 Boot HART         : 0
+  Domain0 HARTs             : 0*,1*,2*
+  Domain0 Region00          : 
0x0000000081000000-0x000000008101ffff ()
+  Domain0 Region01          : 
0x0000000000000000-0xffffffffffffffff (R,W,X)
+  Domain0 Next Address      : 0x0000000081200000
+  Domain0 Next Arg1         : 0x0000000082200000
+  Domain0 Next Mode         : S-mode
+  Domain0 SysReset          : yes
+
+  Boot HART ID              : 0
+  Boot HART Domain          : root
+  Boot HART ISA             : rv64imafdcsu
+  Boot HART Features        : scounteren,mcounteren
+  Boot HART PMP Count       : 0
+  Boot HART PMP Granularity : 0
+  Boot HART PMP Address Bits: 0
+  Boot HART MHPM Count      : 0
+  Boot HART MHPM Count      : 0
+  Boot HART MIDELEG         : 0x0000000000000222
+  Boot HART MEDELEG         : 0x000000000000b109
+  <debug_uart>
+  initcall: 0000000081205cd0
+  initcall: 000000008121f82c
+  initcall: 000000008120992a
+  initcall: 000000008120b2d4
+  initcall: 0000000081205e92
+  initcall: 0000000081205cea
+  initcall: 0000000081205eda
+  initcall: 0000000081205eaa
+  initcall: 0000000081205eae
+  initcall: 0000000081205e8c
+  ofnode_read_bool: u-boot,dm-pre-reloc: true
+  Looking for 'serial' at 1040, name uart@fff0c2c000
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Found seq 0
+  Bound device uart@fff0c2c000 to root_driver
+  ofnode_read_bool: u-boot,dm-pre-reloc: true
+  Looking for 'mmc' at 1872, name sdhci@0xf000000000
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Not found
+  Looking for 'mmc' at 1872, name sdhci@0xf000000000
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Not found
+  mmc_bind: alias ret=-2, devnum=-1
+  Bound device sd...@0xf000000000.blk to sdhci@0xf000000000
+  Bound device sdhci@0xf000000000 to root_driver
+  ofnode_read_bool: u-boot,dm-pre-reloc: true
+  Looking for 'timer' at 2008, name clint@fff1020000
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Not found
+  Bound device clint@fff1020000 to root_driver
+  initcall: 000000008120028a
+  ofnode_read_u32_array: ranges: fdtdec_get_int_array: ranges
+  get_prop_check_min_len: ranges
+  ofnode_read_bool: u-boot,dm-pre-reloc: true
+  Looking for 'cpu' at 336, name cpu@0
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Not found
+  ofnode_read_u32_index: timebase-frequency: (not found)
+  ofnode_read_u32_index: timebase-frequency: 0x7f283 (520835)
+  Bound device riscv_timer to cpu@0
+  Bound device cpu@0 to cpus
+  ofnode_read_bool: u-boot,dm-pre-reloc: true
+  Looking for 'cpu' at 644, name cpu@1
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Not found
+  ofnode_read_u32_index: timebase-frequency: (not found)
+  ofnode_read_u32_index: timebase-frequency: 0x7f283 (520835)
+  Bound device cpu@1 to cpus
+  Bound device cpus to root_driver
+  Looking for highest alias id for 'cpu'
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  clk_get_by_index_tail: Node 'cpu@0', property 'clocks', failed 
to request CLK index 0: -2
+  Looking for highest alias id for 'cpu'
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  clk_get_by_index_tail: Node 'cpu@1', property 'clocks', failed 
to request CLK index 0: -2
+  ofnode_read_prop: riscv,isa: rv64imafdc
+  initcall: 0000000081221336
+  initcall: 0000000081213d8c
+  env_init: Environment <NULL> init done (ret=0)
+  initcall: 0000000081205e68
+  initcall: 00000000812132fe
+  OF: ** translation for device uart@fff0c2c000 **
+  OF: bus is default (na=2, ns=2) on
+  OF: translating address: ff000000 00c0c2f0
+  OF: reached root node
+  ofnode_read_u32_index: reg-offset: (not found)
+  ofnode_read_u32_index: reg-shift: 0x0 (0)
+  ofnode_read_u32_index: reg-io-width: (not found)
+  clk_get_by_index_tail: Node 'uart@fff0c2c000', property 
'clocks', failed to request CLK index 0: -2
+  ofnode_read_u32_index: clock-frequency: 0x3f941f8 (66667000)
+  initcall: 0000000081220592
+
+
+  U-Boot 2021.01-g17d45f5d-dirty (Mar 14 2021 - 20:31:58 +0800)
+
+  initcall: 0000000081205db8
+  U-Boot code: 81200000 -> 8123F0C0  BSS: -> 81241D10
+  initcall: 0000000081205cfe
+  initcall: 0000000081205e50
+  DRAM:  initcall: 0000000081200318
+  fdtdec_setup_mem_size_base: Initial DRAM size 40000000
+  initcall: 0000000081205fca
+  Monitor len: 00041D10
+  Ram size: 40000000
+  Ram top: C0000000
+  initcall: 0000000081205cee
+  initcall: 0000000081205eb2
+  initcall: 0000000081205eb6
+  initcall: 0000000081205eba
+  initcall: 0000000081205d6e
+  Reserving 263k for U-Boot at: bffbe000
+  initcall: 0000000081205f2a
+  Reserving 8316k for malloc() at: bf79f000
+  initcall: 0000000081205ee2
+  Reserving 112 Bytes for Board Info at: bf79ef90
+  initcall: 0000000081205ebe
+  initcall: 0000000081205d40
+  Reserving 384 Bytes for Global Data at: bf79ee10
+  initcall: 0000000081205ec2
+  initcall: 0000000081205ec6
+  initcall: 0000000081205eca
+  initcall: 0000000081205ede
+  initcall: 000000008120603a
+  initcall: 000000008120031c
+  fdtdec_setup_memory_banksize: DRAM Bank #0: start = 
0x80000000, size = 0x40000000
+  initcall: 0000000081205f5a
+
+  RAM Configuration:
+  Bank #0: 80000000 1 GiB
+
+  DRAM:  1 GiB
+  initcall: 0000000081206054
+  initcall: 0000000081205d24
+  New Stack Pointer is: bf79ee00
+  initcall: 0000000081205ece
+  initcall: 0000000081205ed2
+  initcall: 0000000081205ed6
+  initcall: 0000000081205de6
+  Relocation Offset is: 3edbe000
+  Relocating to bffbe000, new gd at bf79ee10, sp at bf79ee00
+  initcall: 0000000081205ea6
+  initcall: 0000000081205d02
+  initcall: 00000000bffc40da
+  initcall: 00000000bffc40de
+  initcall: 00000000812060ee (relocated to 00000000bffc40ee)
+  initcall: 0000000081206228 (relocated to 00000000bffc4228)
+  initcall: 00000000812061f6 (relocated to 00000000bffc41f6)
+  Pre-reloc malloc() used 0x990 bytes (2 KB)
+  using memory 0xbf79f000-0xbffbe000 for malloc()
+  initcall: 000000008120b2d4 (relocated to 00000000bffc92d4)
+  initcall: 00000000812061e2 (relocated to 00000000bffc41e2)
+  initcall: 000000008120622c (relocated to 00000000bffc422c)
+  initcall: 0000000081206230 (relocated to 00000000bffc4230)
+  initcall: 00000000812061cc (relocated to 00000000bffc41cc)
+  clk_set_defaults()
+  clk_set_default_parents: could not read assigned-clock-parents 
for 00000000bf79f090
+  ofnode_read_prop: assigned-clock-rates: <not found>
+  Looking for 'serial' at 1040, name uart@fff0c2c000
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Found seq 0
+  Bound device uart@fff0c2c000 to root_driver
+  Looking for 'mmc' at 1872, name sdhci@0xf000000000
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Not found
+  Looking for 'mmc' at 1872, name sdhci@0xf000000000
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Not found
+  mmc_bind: alias ret=-2, devnum=-1
+  Bound device sd...@0xf000000000.blk to sdhci@0xf000000000
+  Bound device sdhci@0xf000000000 to root_driver
+  Looking for 'timer' at 2008, name clint@fff1020000
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Not found
+  Bound device clint@fff1020000 to root_driver
+  initcall: 00000000812008b4 (relocated to 00000000bffbe8b4)
+  initcall: 000000008120623c (relocated to 00000000bffc423c)
+  initcall: 0000000081206234 (relocated to 00000000bffc4234)
+  initcall: 000000008120a64e (relocated to 00000000bffc864e)
+  initcall: 0000000081213400 (relocated to 00000000bffd1400)
+  OF: ** translation for device uart@fff0c2c000 **
+  OF: bus is default (na=2, ns=2) on
+  OF: translating address: ff000000 00c0c2f0
+  OF: reached root node
+  ofnode_read_u32_index: reg-offset: (not found)
+  ofnode_read_u32_index: reg-shift: 0x0 (0)
+  ofnode_read_u32_index: reg-io-width: (not found)
+  clk_get_by_index_tail: Node 'uart@fff0c2c000', property 
'clocks', failed to request CLK index 0: -2
+  ofnode_read_u32_index: clock-frequency: 0x3f941f8 (66667000)
+  clk_set_defaults(uart@fff0c2c000)
+  clk_set_default_parents: could not read assigned-clock-parents 
for 00000000bf79f180
+  ofnode_read_prop: assigned-clock-rates: <not found>
+  initcall: 00000000812061b0 (relocated to 00000000bffc41b0)
+  Now running in RAM - U-Boot at: bffbe000
+  initcall: 0000000081200316 (relocated to 00000000bffbe316)
+  ofnode_read_u32_array: ranges: fdtdec_get_int_array: ranges
+  get_prop_check_min_len: ranges
+  Looking for 'cpu' at 336, name cpu@0
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Not found
+  ofnode_read_u32_index: timebase-frequency: (not found)
+  ofnode_read_u32_index: timebase-frequency: 0x7f283 (520835)
+  Bound device riscv_timer to cpu@0
+  Bound device cpu@0 to cpus
+  Looking for 'cpu' at 644, name cpu@1
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  Not found
+  ofnode_read_u32_index: timebase-frequency: (not found)
+  ofnode_read_u32_index: timebase-frequency: 0x7f283 (520835)
+  Bound device cpu@1 to cpus
+  Bound device cpus to root_driver
+  clk_set_defaults(cpus)
+  clk_set_default_parents: could not read assigned-clock-parents 
for 00000000bf79f860
+  ofnode_read_prop: assigned-clock-rates: <not found>
+  Looking for highest alias id for 'cpu'
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  clk_set_defaults(cpu@0)
+  clk_set_default_parents: could not read assigned-clock-parents 
for 00000000bf79f930
+  ofnode_read_prop: assigned-clock-rates: <not found>
+  clk_get_by_index_tail: Node 'cpu@0', property 'clocks', failed 
to request CLK index 0: -2
+  Looking for highest alias id for 'cpu'
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  clk_set_defaults(cpu@1)
+  clk_set_default_parents: could not read assigned-clock-parents 
for 00000000bf79fac0
+  ofnode_read_prop: assigned-clock-rates: <not found>
+  clk_get_by_index_tail: Node 'cpu@1', property 'clocks', failed 
to request CLK index 0: -2
+  initcall: 0000000081206238 (relocated to 00000000bffc4238)
+  initcall: 0000000081206190 (relocated to 00000000bffc4190)
+  MMC:   Looking for highest alias id for 'mmc'
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  clk_set_defaults(sdhci@0xf000000000)
+  clk_set_default_parents: could not read assigned-clock-parents 
for 00000000bf79f2a0
+  ofnode_read_prop: assigned-clock-rates: <not found>
+  sdhci@0xf000000000: 0 (eMMC)
+  initcall: 0000000081206136 (relocated to 00000000bffc4136)
+  fdtdec_get_config_int: load-environment
+  Using default environment
+  Initial value for argc=3
+  Final value for argc=3
+  initcall: 0000000081206242 (relocated to 00000000bffc4242)
+  initcall: 000000008120a666 (relocated to 00000000bffc8666)
+  initcall: 0000000081206126 (relocated to 00000000bffc4126)
+  initcall: 0000000081208990 (relocated to 00000000bffc6990)
+  In:    uart@fff0c2c000
+  Out:   uart@fff0c2c000
+  Err:   uart@fff0c2c000
+  Initial value for argc=3
+  Final value for argc=3
+  Initial value for argc=3
+  Final value for argc=3
+  Initial value for argc=3
+  Final value for argc=3
+  initcall: 0000000081200640 (relocated to 00000000bffbe640)
+  initcall: 000000008120611c (relocated to 00000000bffc411c)
+  fdtdec_get_config_int: bootdelay
+  ### main_loop entered: bootdelay=-2
+
+  fdtdec_get_config_int: kernel-offset
+  fdtdec_get_config_int: rootdisk-offset
+  fdtdec_get_config_string: bootcmd
+  fdtdec_get_config_int: bootsecure
+  ### main_loop: bootcmd="fdt addr ${fdtcontroladdr}; fdt move 
${fdtcontroladdr} 0x86000000; ext4load mmc 0:1
0x80200000 Image; booti 0x80200000 - 0x86000000; "
+  Initial value for argc=3
+  Final value for argc=3
+  Initial value for argc=3
+  Final value for argc=3
+  blk_get_devnum_by_typename: if_type=6, devnum=0: 
sd...@0xf000000000.blk, 6, 0
+  miss: start 0, count 1
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  fill: start 0, count 1
+  part_init: try 'EFI': ret=0
+  blk_get_devnum_by_typename: Device desc 00000000bf79f590
+  miss: start 0, count 1
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  fill: start 0, count 1
+  part_init: try 'EFI': ret=0
+  hit: start 0, count 1
+  miss: start 1, count 1
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  fill: start 1, count 1
+  GPT: first_usable_lba: 22 last_usable_lba: 3B723DE last lba: 
10000000
+  alloc_read_gpt_entries: count = 128 * 128 = 16384
+  miss: start 2, count 32
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  part_get_info_efi: start 0x800, size 0x3b71800, name
+  miss: start 802, count 2
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  fill: start 802, count 2
+  EXT4 features COMPAT: 0000003c INCOMPAT: 00000242 RO_COMPAT: 
0000007b
+  EXT2 rev 1, inode_size 256, descriptor size 32
+  ext4fs read 0 group descriptor (blkno 1 blkoff 0)
+  miss: start 808, count 1
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  fill: start 808, count 1
+  miss: start bc8, count 1
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  fill: start bc8, count 1
+  ofnode_read_prop: tick-timer: <not found>
+  Looking for highest alias id for 'timer'
+     - u-boot,dm-pre-reloc,
+     - console, /uart@fff0c2c000
+     - serial0, /uart@fff0c2c000
+  clk_get_by_index_tail: Node 'clint@fff1020000', property 
'clocks', failed to request CLK index 0: -2
+  ofnode_read_u32_index: clock-frequency: (not found)
+  clk_set_defaults(clint@fff1020000)
+  clk_set_default_parents: could not read assigned-clock-parents 
for 00000000bf79f660
+  ofnode_read_prop: assigned-clock-rates: <not found>
+  OF: ** translation for device clint@fff1020000 **
+  OF: bus is default (na=2, ns=2) on
+  OF: translating address: ff000000 000002f1
+  OF: reached root node
+  sifive_clint clint@fff1020000: missing clocks or 
clock-frequency property; falling back on timebase-frequency
+  Iterate dir Image
+  miss: start cbc8, count 1
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  fill: start cbc8, count 1
+  hit: start cbc8, count 1
+  iterate >.<
+  hit: start cbc8, count 1
+  hit: start cbc8, count 1
+  iterate >..<
+  hit: start cbc8, count 1
+  hit: start cbc8, count 1
+  iterate >lost+found<
+  hit: start cbc8, count 1
+  hit: start cbc8, count 1
+  iterate >fw_payload.bin<
+  hit: start cbc8, count 1
+  hit: start cbc8, count 1
+  iterate >Image<
+  ext4fs read 1 group descriptor (blkno 1 blkoff 32)
+  hit: start 808, count 1
+  miss: start 2081, count 1
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  fill: start 2081, count 1
+  lmb_dump_all:
+      memory.cnt             = 0x1
+      memory.size            = 0x0
+      memory.reg[0x0].base   = 0x80000000
+                     .size   = 0x40000000
+
+      reserved.cnt           = 0x0
+      reserved.size          = 0x0
+  Iterate dir Image
+  hit: start cbc8, count 1
+  hit: start cbc8, count 1
+  iterate >.<
+  hit: start cbc8, count 1
+  hit: start cbc8, count 1
+  iterate >..<
+  hit: start cbc8, count 1
+  hit: start cbc8, count 1
+  iterate >lost+found<
+  hit: start cbc8, count 1
+  hit: start cbc8, count 1
+  iterate >fw_payload.bin<
+  hit: start cbc8, count 1
+  hit: start cbc8, count 1
+  iterate >Image<
+  ext4fs read 1 group descriptor (blkno 1 blkoff 32)
+  hit: start 808, count 1
+  hit: start 2081, count 1
+  miss: start bc800, count 12048
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  miss: start bf978, count 17
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  miss: start bf989, count 1
+  blk_find_device: if_type=6, devnum=0: sd...@0xf000000000.blk, 
6, 0
+  fill: start bf989, count 1
+  6492992 bytes read in 5329 ms (1.2 MiB/s)
+  Initial value for argc=3
+  Final value for argc=3
+  Initial value for argc=3
+  Final value for argc=3
+  *  kernel: cmdline image address = 0x80200000
+  ## Skipping init Ramdisk
+  ## No init Ramdisk
+     ramdisk start = 0x00000000, ramdisk end = 0x00000000
+  *  fdt: cmdline image address = 0x86000000
+  ## Checking for 'FDT'/'FDT Image' at 86000000
+  *  fdt: raw FDT blob
+  ## Flattened Device Tree blob at 86000000
+     Booting using the fdt blob at 0x86000000
+     of_flat_tree at 0x86000000 size 0x00001dbb
+  Initial value for argc=3
+  Final value for argc=3
+  ## initrd_high = 0xc0000000, copy_to_ram = 1
+     ramdisk load start = 0x00000000, ramdisk load end = 0x00000000
+  Initial value for argc=3
+  Final value for argc=3
+  Initial value for argc=3
+  Final value for argc=3
+  using: FDT
+  ## device tree at 0000000086000000 ... 0000000086001dba 
(len=19899 [0x4DBB])
+     Loading Device Tree to 00000000bfffb000, end 
00000000bffffdba ... OK
+  Initial value for argc=3
+  Final value for argc=3
+  ## Transferring control to kernel (at address 80200000) ...
+
+  Starting kernel ...
+
+  [    0.000000] OF: fdt: Ignoring memory range 0x80000000 - 
0x80200000
+  [    0.000000] Linux version 5.6.0-rc4-gb9d34f7e294d-dirty 
(eva@eva-virtual-machine) (gcc version 7.5.0 (Ubuntu
7.5.0-3ubuntu1~18.04)) #27 SMP Mon Mar 1 23:47:04 CST 2021
+  [    0.000000] earlycon: sbi0 at I/O port 0x0 (options '')
+  [    0.000000] printk: bootconsole [sbi0] enabled
+  [    0.000000] Zone ranges:
+  [    0.000000]   DMA32    [mem 
0x0000000080200000-0x00000000bfffffff]
+  [    0.000000]   Normal   empty
+  [    0.000000] Movable zone start for each node
+  [    0.000000] Early memory node ranges
+  [    0.000000]   node   0: [mem 
0x0000000080200000-0x00000000bfffffff]
+  [    0.000000] Initmem setup node 0 [mem 
0x0000000080200000-0x00000000bfffffff]
+  [    0.000000] On node 0 totalpages: 261632
+  [    0.000000]   DMA32 zone: 4088 pages used for memmap
+  [    0.000000]   DMA32 zone: 0 pages reserved
+  [    0.000000]   DMA32 zone: 261632 pages, LIFO batch:63
+  [    0.000000] software IO TLB: mapped [mem 
0xbaff7000-0xbeff7000] (64MB)
+  [    0.000000] SBI specification v0.2 detected
+  [    0.000000] SBI implementation ID=0x1 Version=0x9
+  [    0.000000] SBI v0.2 TIME extension detected
+  [    0.000000] SBI v0.2 IPI extension detected
+  [    0.000000] SBI v0.2 RFENCE extension detected
+  [    0.000000] SBI v0.2 HSM extension detected
+  [    0.000000] elf_hwcap is 0x112d
+  [    0.000000] percpu: Embedded 16 pages/cpu s25368 r8192 
d31976 u65536
+  [    0.000000] pcpu-alloc: s25368 r8192 d31976 u65536 
alloc=16*4096
+  [    0.000000] pcpu-alloc: [0] 0 [0] 1
+  [    0.000000] Built 1 zonelists, mobility grouping on. Total 
pages: 257544
+  [    0.000000] Kernel command line: earlycon=sbi 
root=/dev/piton_sd1
+  [    0.000000] Dentry cache hash table entries: 131072 (order: 
8, 1048576 bytes, linear)
+  [    0.000000] Inode-cache hash table entries: 65536 (order: 
7, 524288 bytes, linear)
+  [    0.000000] Sorting __ex_table...
+  [    0.000000] mem auto-init: stack:off, heap alloc:off, heap 
free:off
+  [    0.000000] Memory: 956188K/1046528K available (4357K 
kernel code, 286K rwdata, 1200K rodata, 168K init, 311K bss,
90340K reserved, 0K cma-reserved)
+  [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, 
CPUs=2, Nodes=1
+  [    0.000000] rcu: Hierarchical RCU implementation.
+  [    0.000000] rcu:     RCU restricting CPUs from NR_CPUS=8 to 
nr_cpu_ids=2.
+  [    0.000000] rcu: RCU calculated value of 
scheduler-enlistment delay is 10 jiffies.
+  [    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, 
nr_cpu_ids=2
+  [    0.000000] NR_IRQS: 0, nr_irqs: 0, preallocated irqs: 0
+  [    0.000000] plic: mapped 2 interrupts with 2 handlers for 4 
contexts.
+  [    0.000000] riscv_timer_init_dt: Registering clocksource 
cpuid [0] hartid [0]
+  [    0.000000] clocksource: riscv_clocksource: mask: 
0xffffffffffffffff max_cycles: 0x1ec037a6a, max_idle_ns:
7052723236599 ns
+  [    0.000147] sched_clock: 64 bits at 520kHz, resolution 
1919ns, wraps every 4398046510738ns
+  [    0.009642] printk: console [hvc0] enabled
+  [    0.009642] printk: console [hvc0] enabled
+  [    0.018055] printk: bootconsole [sbi0] disabled
+  [    0.018055] printk: bootconsole [sbi0] disabled
+  [    0.028266] Calibrating delay loop (skipped), value 
calculated using timer frequency.. 1.04 BogoMIPS (lpj=5208)
+  [    0.038993] pid_max: default: 32768 minimum: 301
+  [    0.049869] Mount-cache hash table entries: 2048 (order: 2, 
16384 bytes, linear)
+  [    0.058262] Mountpoint-cache hash table entries: 2048 
(order: 2, 16384 bytes, linear)
+  [    0.069225] *** VALIDATE tmpfs ***
+  [    0.089356] *** VALIDATE proc ***
+  [    0.101548] *** VALIDATE cgroup ***
+  [    0.105423] *** VALIDATE cgroup2 ***
+  [    0.144623] rcu: Hierarchical SRCU implementation.
+  [    0.164975] smp: Bringing up secondary CPUs ...
+  [    0.194931] smp: Brought up 1 node, 2 CPUs
+  [    0.216819] devtmpfs: initialized
+  [    0.247264] random: get_random_u32 called from 
bucket_table_alloc.isra.25+0x4e/0x15c with crng_init=0
+  [    0.267593] clocksource: jiffies: mask: 0xffffffff 
max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
+  [    0.278485] futex hash table entries: 512 (order: 3, 32768 
bytes, linear)
+  [    0.300550] NET: Registered protocol family 16
+  [    0.834379] clocksource: Switched to clocksource 
riscv_clocksource
+  [    0.842324] *** VALIDATE bpf ***
+  [    0.856050] *** VALIDATE ramfs ***
+  [    0.910981] NET: Registered protocol family 2
+  [    0.937371] tcp_listen_portaddr_hash hash table entries: 
512 (order: 1, 8192 bytes, linear)
+  [    0.947904] TCP established hash table entries: 8192 
(order: 4, 65536 bytes, linear)
+  [    0.959472] TCP bind hash table entries: 8192 (order: 5, 
131072 bytes, linear)
+  [    0.972158] TCP: Hash tables configured (established 8192 
bind 8192)
+  [    0.986974] UDP hash table entries: 512 (order: 2, 16384 
bytes, linear)
+  [    0.995658] UDP-Lite hash table entries: 512 (order: 2, 
16384 bytes, linear)
+  [    1.010319] NET: Registered protocol family 1
+  [    1.038492] RPC: Registered named UNIX socket transport 
module.
+  [    1.045494] RPC: Registered udp transport module.
+  [    1.050417] RPC: Registered tcp transport module.
+  [    1.055833] RPC: Registered tcp NFSv4.1 backchannel 
transport module.
+  [    1.079432] Initialise system trusted keyrings
+  [    1.090919] workingset: timestamp_bits=46 max_order=18 
bucket_order=0
+  [    1.442287] *** VALIDATE nfs ***
+  [    1.447483] *** VALIDATE nfs4 ***
+  [    1.452686] NFS: Registering the id_resolver key type
+  [    1.458989] Key type id_resolver registered
+  [    1.464122] Key type id_legacy registered
+  [    1.468760] nfs4filelayout_init: NFSv4 File Layout Driver 
Registering...
+  [    1.476542] Installing knfsd (copyright (C) 1996 
o...@monad.swb.de).
+  [    1.979131] Key type asymmetric registered
+  [    1.984371] Asymmetric key parser 'x509' registered
+  [    1.990770] Block layer SCSI generic (bsg) driver version 
0.4 loaded (major 254)
+  [    1.999112] io scheduler mq-deadline registered
+  [    2.004492] io scheduler kyber registered
+  [    4.260627] Serial: 8250/16550 driver, 4 ports, IRQ sharing 
disabled
+  [    4.312162] fff0c2c000.uart: ttyS0 at MMIO 0xfff0c2c000 
(irq = 1, base_baud = 4166687) is a 16550
+  [    4.659782] loop: module loaded
+  [    4.663995] piton_sd:v1.0 Apr 26, 2019
+  [    4.663995]
+  [    4.670302] gpt partition table header:
+  [    4.670398] signature: 5452415020494645
+  [    4.674979] revision: 10000
+  [    4.678967] size: 5c
+  [    4.681839] crc_header: 680c3ba9
+  [    4.684662] reserved: 0
+  [    4.688037] current lba: 1
+  [    4.690560] backup lda: 3b723ff
+  [    4.693880] partition entries lba: 2
+  [    4.697190] number partition entries: 80
+  [    4.700843] size partition entries: 80
+  [   10.126082]  piton_sd: piton_sd1
+  [   10.786268] libphy: Fixed MDIO Bus: probed
+  [   10.837802] NET: Registered protocol family 10
+  [   10.874758] Segment Routing with IPv6
+  [   10.880578] sit: IPv6, IPv4 and MPLS over IPv4 tunneling 
driver
+  [   10.905701] NET: Registered protocol family 17
+  [   10.918150] Key type dns_resolver registered
+  [   10.932005] Loading compiled-in X.509 certificates
+  [   11.147948] EXT4-fs (piton_sd1): mounted filesystem with 
ordered data mode. Opts: (null)
+  [   11.158370] VFS: Mounted root (ext4 filesystem) readonly on 
device 254:1.
+  [   11.233225] devtmpfs: mounted
+  [   11.245265] Freeing unused kernel memory: 168K
+  [   11.249963] This architecture does not have kernel memory 
protection.
+  [   11.257188] Run /sbin/init as init process
+  [   11.261430]   with arguments:
+  [   11.265087]     /sbin/init
+  [   11.267950]   with environment:
+  [   11.271162]     HOME=/
+  [   11.274453]     TERM=linux
+  [   18.961333] systemd[1]: System time before build time, 
advancing clock.
+  [   19.340844] systemd[1]: systemd 238 running in system mode. 
(+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT
+UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 -SECCOMP 
+BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 defaul
+  t-hierarchy=hybrid)
+  [   19.370409] systemd[1]: Detected architecture riscv64.
+
+  Welcome to Debian GNU/Linux buster/sid!
+
+  [   19.587454] systemd[1]: Set hostname to <openpiton>.
+  [   29.215526] random: systemd: uninitialized urandom read (16 
bytes read)
+  [   29.234429] systemd[1]: Listening on /dev/initctl 
Compatibility Named Pipe.
+  [  OK  ] Listening on /dev/initctl Compatibility Named Pipe.
+  [   29.272633] random: systemd: uninitialized urandom read (16 
bytes read)
+  [   29.392391] systemd[1]: Created slice 
system-serial\x2dgetty.slice.
+  [  OK  ] Created slice system-serial\x2dgetty.slice.
+  [   29.423151] random: systemd: uninitialized urandom read (16 
bytes read)
+  [   29.441241] systemd[1]: Started Dispatch Password Requests 
to Console Directory Watch.
+  [  OK  ] Started Dispatch Password Requests to Console 
Directory Watch.
+  [   29.526093] systemd[1]: Created slice system-getty.slice.
+  [  OK  ] Created slice system-getty.slice.
+  [   29.555742] systemd[1]: Reached target Swap.
+  [  OK  ] Reached target Swap.
+  [   29.593093] systemd[1]: Started Forward Password Requests 
to Wall Directory Watch.
+  [  OK  ] Started Forward Password Requests to Wall Directory 
Watch.
+  [   29.628869] systemd[1]: Reached target Local Encrypted 
Volumes.
+  [  OK  ] Reached target Local Encrypted Volumes.
+  [   29.677206] systemd[1]: Listening on Journal Socket.
+  [  OK  ] Listening on Journal Socket.
+  [   29.861203] systemd[1]: Starting Remount Root and Kernel 
File Systems...
+           Starting Remount Root and Kernel File Systems...
+  [   29.987658] systemd[1]: Listening on Journal Socket 
(/dev/log).
+  [  OK  ] Listening on Journal Socket (/dev/log).
+           Starting Load Kernel Modules...
+           Mounting Kernel Debug File System...
+  [  OK  ] Listening on udev Kernel Socket.
+  [  OK  ] Reached target Paths.
+           Starting Journal Service...
+           Starting Create Static Device Nodes in /dev...
+  [  OK  ] Reached target Remote File Systems.
+  [  OK  ] Reached target Slices.
+  [  OK  ] Listening on udev Control Socket.
+           Starting udev Coldplug all Devices...
+  [  OK  ] Reached target Sockets.
+  [   34.481282] systemd[1]: Started Remount Root and Kernel 
File Systems.
+  [  OK  ] Started Remount Root and Kernel File Systems.
+  [   35.320761] systemd[1]: Started Load Kernel Modules.
+  [  OK  ] Started Load Kernel Modules.
+  [   35.438044] systemd[1]: Mounted Kernel Debug File System.
+  [  OK  ] Mounted Kernel Debug File System.
+  [   35.771088] systemd[1]: Started Create Static Device Nodes 
in /dev.
+  [  OK  ] Started Create Static Device Nodes in /dev.
+  [   36.367663] systemd[1]: Starting Apply Kernel Variables...
+           Starting Apply Kernel Variables...
+  [   39.671147] systemd[1]: Starting Load/Save Random Seed...
+           Starting Load/Save Random Seed...
+  [   39.737905] systemd[1]: Reached target Local File Systems 
(Pre).
+  [  OK  ] Reached target Local File Systems (Pre).
+  [   39.830756] systemd[1]: Reached target Local File Systems.
+  [  OK  ] Reached target Local File Systems.
+  [   40.432728] systemd[1]: Starting udev Kernel Device Manager...
+           Starting udev Kernel Device Manager...
+  [   40.551781] systemd[1]: Started Journal Service.
+  [  OK  ] Started Journal Service.
+  [  OK  ] Started Apply Kernel Variables.
+           Starting Raise network interfaces...
+           Starting Flush Journal to Persistent Storage...
+  [  OK  ] Started Load/Save Random Seed.
+  [  OK  ] Started udev Kernel Device Manager.
+  [*     ] (1 of 4) A start job is running for&ersistent Storage 
(23s / 1min 44s)[   53.102639] systemd-journald[93]:
Received request to flush runtime journal from PID 1
+  [  OK  ] Started Flush Journal to Persistent Storage.
+           Starting Create Volatile Files and Directories...
+  [  OK  ] Started Raise network interfaces.
+  [  OK  ] Reached target Network.
+  [FAILED] Failed to start Create Volatile Files and Directories.
+  See 'systemctl status systemd-tmpfiles-setup.service' for 
details.
+           Starting Update UTMP about System Boot/Shutdown...
+  [FAILED] Failed to start Network Time Synchronization.
+  See 'systemctl status systemd-timesyncd.service' for details.
+  [  OK  ] Reached target System Time Synchronized.
+  [  OK  ] Stopped Network Time Synchronization.
+  [FAILED] Failed to start Network Time Synchronization.
+  See 'systemctl status systemd-timesyncd.service' for details.
+  [  OK  ] Stopped Network Time Synchronization.
+  [FAILED] Failed to start Network Time Synchronization.
+  See 'systemctl status systemd-timesyncd.service' for details.
+  [  OK  ] Stopped Network Time Synchronization.
+  [FAILED] Failed to start Network Time Synchronization.
+  See 'systemctl status systemd-timesyncd.service' for details.
+  [  OK  ] Stopped Network Time Synchronization.
+  [FAILED] Failed to start Network Time Synchronization.
+  See 'systemctl status systemd-timesyncd.service' for details.
+  [FAILED] Failed to start Update UTMP about System Boot/Shutdown.
+  See 'systemctl status systemd-update-utmp.service' for details.
+  [DEPEND] Dependency failed for Update UTMP about System 
Runlevel Changes.
+  [  OK  ] Stopped Network Time Synchronization.
+  [FAILED] Failed to start Network Time Synchronization.
+  See 'systemctl status systemd-timesyncd.service' for details.
+  [*     ] (2 of 2) A start job is running for&v-hvc0.device 
(2min 6s / 4min 33s)
+  [  OK  ] Found device /dev/hvc0.
+  [  OK  ] Started udev Coldplug all Devices.
+  [  OK  ] Reached target System Initialization.
+  [  OK  ] Started Daily apt download activities.
+  [  OK  ] Reached target Basic System.
+           Starting Permit User Sessions...
+  [  OK  ] Started Daily apt upgrade and clean activities.
+  [  OK  ] Started Daily Cleanup of Temporary Directories.
+  [  OK  ] Reached target Timers.
+  [  OK  ] Started Regular background program processing daemon.
+  [  OK  ] Started Permit User Sessions.
+  [  OK  ] Started Serial Getty on hvc0.
+  [  OK  ] Reached target Login Prompts.
+  [  OK  ] Reached target Multi-User System.
+  [  OK  ] Reached target Graphical Interface.
+
+  Debian GNU/Linux buster/sid openpiton hvc0
+
+  openpiton login: openpiton
+  Password:
+  Linux openpiton 5.6.0-rc4-gb9d34f7e294d-dirty #27 SMP Mon Mar 
1 23:47:04 CST 2021 riscv64
+
+  The programs included with the Debian GNU/Linux system are 
free software;
+  the exact distribution terms for each program are described in 
the
+  individual files in /usr/share/doc/*/copyright.
+
+  Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
+  permitted by applicable law.
+  openpiton@openpiton:~$ lscpu
+  Architecture:        riscv64
+  Byte Order:          Little Endian
+  CPU(s):              2
+  On-line CPU(s) list: 0,1
+  Thread(s) per core:  2
+  Core(s) per socket:  1
+  Socket(s):           1
+  openpiton@openpiton:~$
+  openpiton@openpiton:~$
diff --git a/include/configs/openpiton-riscv.h 
b/include/configs/openpiton-riscv.h
new file mode 100644
index 00000000..0f30609b
--- /dev/null
+++ b/include/configs/openpiton-riscv.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2019 Western Digital Corporation or its 
affiliates.
+ * Copyright (c) 2021 Tianrui Wei
+ *
+ * Authors:
+ *   Anup Patel <anup.pa...@wdc.com>
+ *   Tianrui Wei <tianrui-...@outlook.com>
+ */
+
+#ifndef __OPENPITON_RISCV_CONFIG_H
+#define __OPENPITON_RISCV_CONFIG_H
+
+#include <linux/sizes.h>
+#define DEBUG
+#ifdef CONFIG_SPL
+#define CONFIG_SPL_MAX_SIZE     0x00100000
+#define CONFIG_SPL_BSS_START_ADDR   0x82000000
+#define CONFIG_SPL_BSS_MAX_SIZE     0x00100000
+#define CONFIG_SYS_SPL_MALLOC_START (CONFIG_SPL_BSS_START_ADDR + \
+        CONFIG_SPL_BSS_MAX_SIZE)
+#define CONFIG_SYS_SPL_MALLOC_SIZE  0x0100000
+#define CONFIG_SPL_STACK    (0x80000000 + 0x04000000 - \

Please use SZ_64M here, or just use an absolute address.


Will fix



+        GENERATED_GBL_DATA_SIZE)
+
+#define CONFIG_SPL_FS_LOAD_PAYLOAD_NAME "boot/fw_payload.bin"
+#define CONFIG_SPL_GD_ADDR 0x85000000
+#endif
+
+/* Environment options */
+#define CONFIG_SYS_SDRAM_BASE 0x80000000
+#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + SZ_2M)
+#define CONFIG_SYS_LOAD_ADDR (CONFIG_SYS_SDRAM_BASE + SZ_2M)
+#define CONFIG_SYS_MALLOC_LEN       SZ_256M
+#define CONFIG_SYS_BOOTM_LEN        SZ_256M
+
+/* -------------------------------------------------
+ * Environment
+ */
+//Disable persistent environment variable storage
+#define CONFIG_ENV_IS_NOWHERE   1
+
+/* 
--------------------------------------------------------------------- 

+ * Board boot configuration
+ */
+
+#define CONFIG_EXTRA_ENV_SETTINGS "\0"

Please define some of the raw addresses used below to make 
modifying the
boot process easier. For example,

    fdt_addr_r=0x86000000
    kernel_addr_r=0x80200000
    image=Image
    mmcdev=0
    mmcpart=1


Good idea! Will do!




+
+#define CONFIG_USE_BOOTCOMMAND
+#define CONFIG_BOOTCOMMAND \
+    "fdt addr ${fdtcontroladdr}; " \
+    "fdt move ${fdtcontroladdr} 0x86000000; " \
+    "ext4load mmc 0:1 0x80200000 boot/Image; " \

Can you use "load" from CONFIG_CMD_FS_GENERIC?





+    "booti 0x80200000 - 0x86000000; "

Is there a bootm flow?


No we don't support fit yet for some hardware reasons.

Can you elaborate on that? I wasn't aware of any restrictions in this
area.


So OpenPiton is actually some kind of SoC generator that generates
different SoC on FPGA. The device tree was generated at bitstream
creation time to facilitate different configurations, so each board
can have different device trees. We're aware of any way to do this in
FIT.

Oh, so you're saying that the devicetree is placed at a specific address
in hardware? Does it need any fixups?


No for now we just embed it in SPL, will be converted into the bootrom 
for the chip with a small ZSBL.

Also, now that you mention fixups u-boot spl doesn't work at high 
address like 0xffffff0000 for now. Is that the case?



--Sean


Thanks,

Tianrui