On 02/16/2015 03:15 PM, Nishanth Menon wrote:
On 02/16/2015 12:22 PM, Vitaly Andrianov wrote:
Currently to flash u-boot image onto NAND or SPI NOR flash, very first
time user need to use Code Composer Studio (CCS). This is cumbersome for
an user not familiar with CCS. This patch add simpler procedure using
uart boot mode for K2 EVMs.
When UART bootmode is set and board is rebooted, the ROM boot loader
transfers the image at the beginning of the MSMC. After the transfer
please explain MSMC.
is complete the boot-loader sets the PC to the first MSMC address
0x0c000000. The u-boot.bin is linked to the address 0x0c001000.
why not just shift u-boot.bin to start of MSMC address?
We already have u-boot linked to the 0x0c001000 address. Why do we need
to build another version for one time process.
In order to use the u-boot.bin as an image for UART download, we need to
add 4K zeros prefix that act as 1K NOP instructions before reaching
0xc001000.
OR, add a relocation logic which saves the 1k NOP and resultant load time?
Relocation logic to where? ROM bootloader? I can put a branch
instruction at the beginning, but we still need 4k of pad, which will be
loaded anyways. So, adding the branch will reduce several microseconds
out of ~40 seconds.
Signed-off-by: Vitaly Andrianov <vita...@ti.com>
Acked-by: Murali Karicheri <m-kariche...@ti.com>
Tested-by: Murali Karicheri <m-kariche...@ti.com>
---
Makefile | 6 ++++++
board/ti/ks2_evm/README | 17 +++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/Makefile b/Makefile
index 36a9a28..7a86cac 100644
--- a/Makefile
+++ b/Makefile
@@ -940,6 +940,12 @@ u-boot-nand.gph: u-boot.bin FORCE
$(call if_changed,mkimage)
@dd if=/dev/zero bs=8 count=1 2>/dev/null >> $@
+u-boot.uart.pad:
+ @dd if=/dev/zero bs=4 count=1024 2>/dev/null > $@
How about the cleaning up?
is it not better to do this algorithmically?
Cleaning up what?
The u-boot.uart.pad is cleaned by the "clean" target.
+
+u-boot.uart: u-boot.uart.pad u-boot.bin FORCE
+ $(call if_changed,cat)
+
# x86 uses a large ROM. We fill it with 0xff, put the 16-bit stuff (including
# reset vector) at the top, Intel ME descriptor at the bottom, and U-Boot in
# the middle.
diff --git a/board/ti/ks2_evm/README b/board/ti/ks2_evm/README
index 9ee90a4..a1fc943 100644
--- a/board/ti/ks2_evm/README
+++ b/board/ti/ks2_evm/README
@@ -81,6 +81,23 @@ To build u-boot-nand.gph
>make k2hk_evm_defconfig
>make u-boot-nand.gph
+To build u-boot.uart
+ >make k2hk_evm_defconfig
+ >make u-boot.uart
+
+
extra EOL?
Will remove
+Load and Run U-Boot on keystone EVMs using UART download
+========================================================
+
+Open BMC and regular UART terminals.
+
+1. On the regular UART port start xmodem transfer of the u-boot.uart
+2. Using BMC terminal set the ARM-UART bootmode and reboot the EVM
+ BMC> bootmode #4
+ MBC> reboot
+3. When xmodem is complete you should see the u-boot starts on the UART port
This is hard to do in practice. At times when one has regular OS
running already in uart port, it tends to mess up xmodem before we
switch terminal and issue bootmode #4 and reboot to BMC.
instead, the only failsafe sequence I could come up with is as follows:
All point to have uart download is when the flashed u-boot is broken and
board doesn't boot up at all. In that case it cannot run regular OS you
are talking about. If u-boot can run regular OS, it can also upgrade the
u-boot by itself.
----
In this method, we use xmodem to download and start the modified
version of uart binary to the target over serial port. Open the BCM
and regular UART port at 115200n8 configuration. Steps are rather trivial:
1. At the BCM terminal, select the following to configure DSP noboot:
bootmode #15
reboot
This should prevent any existing bootloader OR OS from starting up
on UART
2. Start Xmodem transfer of the file u-boot-uart.gph on the regular
UART port
using minicom OR appropriate terminal emulator.
3. At the BCM terminal, Switch over to UART mode and restart.
bootmode #4
reboot
4. At the UART terminal, the transfer completes and u-boot startsup.
This may
be used to download and flash u-boot to nand/spi etc.
----
+
+
extra EOL?
Will remove
Load and Run U-Boot on keystone EVMs using CCS
=========================================
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