From: Henry Beberman <henry.beber...@microsoft.com>
This patch is to enable U-Boot to pass configuration information
available during U-Boot Proper into a subsequent OS. This is required
for Windows because it lacks device tree support.
When CONFIG_GLOBAL_PAGE and CONFIG_UEFI_BOOT are set on an i.MX6 or
i.MX7 platform the go command will initialize a 4k page at a hardcoded
offset to zero. Then it will set a signature and revision number at the
start of the page so the consumer of the configuration can verify that
the page has been initialized to the expected format.
Signed-off-by: Henry Beberman <henry.beber...@microsoft.com>
Cc: Stefano Babic <sba...@denx.de>
Cc: Fabio Estevam <fabio.este...@nxp.com>
---
arch/arm/mach-imx/Kconfig | 7 +++++++
arch/arm/mach-imx/Makefile | 1 +
arch/arm/mach-imx/boot.c | 6 ++++++
arch/arm/mach-imx/global_page.c | 28 ++++++++++++++++++++++++++++
include/configs/mx6_common.h | 11 +++++++++++
include/configs/mx7_common.h | 5 +++++
include/global_page.h | 24 ++++++++++++++++++++++++
7 files changed, 82 insertions(+)
create mode 100644 arch/arm/mach-imx/global_page.c
create mode 100644 include/global_page.h
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 3aec89d440..c88fa2ca1b 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -78,3 +78,10 @@ config NXP_BOARD_REVISION
NXP boards based on i.MX6/7 contain the board revision information
stored in the fuses. Select this option if you want to be able to
retrieve the board revision information.
+
+config GLOBAL_PAGE
+ bool "Enable global 4K page for configuration sharing"
+ default n
+ help
+ This option creates a global 4K page to store U-Boot environment data
+ to pass to another environment such as UEFI or Windows.
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index a81af51f03..be095d71a2 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_SATA) += sata.o
obj-$(CONFIG_SECURE_BOOT) += hab.o
obj-$(CONFIG_SYSCOUNTER_TIMER) += syscounter.o
obj-$(CONFIG_UEFI_BOOT) += boot.o
+obj-$(CONFIG_GLOBAL_PAGE) += global_page.o
endif
ifeq ($(SOC),$(filter $(SOC),mx7ulp))
obj-y += cache.o
diff --git a/arch/arm/mach-imx/boot.c b/arch/arm/mach-imx/boot.c
index 457a323fa2..2dbde8d8ee 100644
--- a/arch/arm/mach-imx/boot.c
+++ b/arch/arm/mach-imx/boot.c
@@ -5,6 +5,7 @@
#include <common.h>
#include <command.h>
+#include <global_page.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -12,6 +13,11 @@ DECLARE_GLOBAL_DATA_PTR;
unsigned long do_go_exec(ulong (*entry)(int, char * const []), int argc,
char * const argv[])
{
+#ifdef CONFIG_GLOBAL_PAGE
+ init_global_page();
+ publish_to_global_page();
+#endif
+
cleanup_before_linux();
return entry(argc, argv);
diff --git a/arch/arm/mach-imx/global_page.c b/arch/arm/mach-imx/global_page.c
new file mode 100644
index 0000000000..139e18f4bc
--- /dev/null
+++ b/arch/arm/mach-imx/global_page.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Microsoft Corporation
+ */
+
+#include <global_page.h>
+#include <environment.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct imx_global_page *global_page =
+ (struct imx_global_page *)GLOBAL_PAGE_BASE_ADDRESS;
+
+void init_global_page(void)
+{
+ /* Clear global page */
+ memset(global_page, 0, 0x1000);
+
+ /* Set signature to 'GLBL' */
+ global_page->header.signature = 0x474c424c;
+
+ /* Set revision */
+ global_page->header.revision = 0;
+}
+
+void publish_to_global_page(void)
+{
+}
diff --git a/include/configs/mx6_common.h b/include/configs/mx6_common.h
index 756db4da61..6571787e50 100644
--- a/include/configs/mx6_common.h
+++ b/include/configs/mx6_common.h
@@ -74,4 +74,15 @@
#define CONFIG_SYS_NORMAL_WORLD
#endif
+/* Define global page address */
+#if defined(CONFIG_GLOBAL_PAGE)
+#if defined(CONFIG_MX6SL) || defined(CONFIG_MX6SLL) || \
+ defined(CONFIG_MX6SX) || \
+ defined(CONFIG_MX6UL) || defined(CONFIG_MX6ULL)
+#define GLOBAL_PAGE_BASE_ADDRESS 0x82003000
+#else
+#define GLOBAL_PAGE_BASE_ADDRESS 0x10817000
+#endif
+#endif
+
#endif
diff --git a/include/configs/mx7_common.h b/include/configs/mx7_common.h
index 4864df5108..a26805e93c 100644
--- a/include/configs/mx7_common.h
+++ b/include/configs/mx7_common.h
@@ -63,4 +63,9 @@
#define CONFIG_SYS_NORMAL_WORLD
#endif
+/* Define global page address */
+#if defined(CONFIG_GLOBAL_PAGE)
+#define GLOBAL_PAGE_BASE_ADDRESS 0x82003000
+#endif
+
#endif
diff --git a/include/global_page.h b/include/global_page.h
new file mode 100644
index 0000000000..a9ee6b67ad
--- /dev/null
+++ b/include/global_page.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0+*/
+/*
+ * Copyright (C) 2018 Microsoft Corporation
+ */
+
+#ifndef _GLOBAL_PAGE_H
+#define _GLOBAL_PAGE_H
+
+#include <common.h>
+
+struct global_page_header {
+ u32 signature;
+ u8 revision;
+ u8 reserved[3];
+} __packed;
+
+struct imx_global_page {
+ struct global_page_header header;
+} __packed;
+
+void init_global_page(void);
+void publish_to_global_page(void);
+
+#endif
--
2.16.2.gvfs.1.33.gf5370f1
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
https://lists.denx.de/listinfo/u-boot
