This adds Linux booting to the SPL
This depends on CONFIG_MACH_TYPE patch by Igor Grinberg
(http://article.gmane.org/gmane.comp.boot-loaders.u-boot/105809)
Related CONFIGs:
CONFIG_SPL_OS_BOOT
Activates/Deactivates the OS booting feature
CONFIG_SPL_OS_BOOT_KEY
defines the IO-pin number u-boot switch - if pressed u-boot is booted
CONFIG_SYS_NAND_SPL_KERNEL_OFFS
Offset in NAND of direct boot kernel image to use in SPL
CONFIG_SYS_SPL_ARGS_ADDR
Address where the kernel boot arguments are expected - this is normaly
RAM-begin + 0x100
Signed-off-by: Simon Schwarz <simonschwarz...@gmail.com>
---
V2 changes:
nothing
V3 changes:
nothing
V4 changes:
CHG Using CONFIG_MACH_TYPE now.
DEL CONFIG_SYS_SPL_MACHID
CHG Use CONFIG_MACH_TYPE for machine id config - This makes the patch
depending on the patch linked above
V5 changes:
FIX compile errors for OMAP4
REBASE u-boot-ti adapted new general gpio interface
---
arch/arm/cpu/armv7/omap-common/spl.c | 49 ++++++++++++++++++++++++++++++++-
include/configs/devkit8000.h | 9 +++++-
2 files changed, 54 insertions(+), 4 deletions(-)
diff --git a/arch/arm/cpu/armv7/omap-common/spl.c
b/arch/arm/cpu/armv7/omap-common/spl.c
index c76fea6..a7afd0a 100644
--- a/arch/arm/cpu/armv7/omap-common/spl.c
+++ b/arch/arm/cpu/armv7/omap-common/spl.c
@@ -35,6 +35,7 @@
#include <asm/arch/mmc_host_def.h>
#include <i2c.h>
#include <image.h>
+#include <asm/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -63,6 +64,25 @@ void board_init_f(ulong dummy)
relocate_code(CONFIG_SPL_STACK, &gdata, CONFIG_SPL_TEXT_BASE);
}
+/* Return the value of the U-boot key
+ *
+ * RETURN
+ * 0 if not pressed
+ * positiv if pressed
+ */
+#ifdef CONFIG_SPL_OS_BOOT
+int spl_uboot_key(void)
+{
+ int val = 0;
+ if (!gpio_request(CONFIG_SPL_OS_BOOT_KEY, "U-Boot key")) {
+ gpio_direction_input(CONFIG_SPL_OS_BOOT_KEY);
+ val = gpio_get_value(CONFIG_SPL_OS_BOOT_KEY);
+ gpio_free(CONFIG_SPL_OS_BOOT_KEY);
+ }
+ return !val;
+}
+#endif
+
void spl_parse_image_header(const struct image_header *header)
{
u32 header_size = sizeof(struct image_header);
@@ -90,7 +110,25 @@ void spl_parse_image_header(const struct image_header
*header)
}
}
-static void jump_to_image_no_args(void)
+/* This function jumps to an image with argument. Normally an FDT or ATAGS
+ * image.
+ * arg: Pointer to paramter image in RAM
+ */
+#ifdef CONFIG_SPL_OS_BOOT
+void jump_to_image_linux(void *arg)
+{
+ debug("Entering kernel arg pointer: 0x%X\n", arg);
+ typedef void (*image_entry_arg_t)(int, int, void *)
+ __attribute__ ((noreturn));
+ image_entry_arg_t image_entry =
+ (image_entry_arg_t) spl_image.entry_point;
+ /* cleanup_before_linux(); */ /*write SPL function for that*/
+ image_entry(0, CONFIG_MACH_TYPE, arg);
+}
+void jump_to_image_linux(void *) __attribute__ ((noreturn));
+#endif
+
+void jump_to_image_no_args(void)
{
typedef void (*image_entry_noargs_t)(void)__attribute__ ((noreturn));
image_entry_noargs_t image_entry =
@@ -99,8 +137,8 @@ static void jump_to_image_no_args(void)
debug("image entry point: 0x%X\n", spl_image.entry_point);
image_entry();
}
-
void jump_to_image_no_args(void) __attribute__ ((noreturn));
+
void board_init_r(gd_t *id, ulong dummy)
{
u32 boot_device;
@@ -134,6 +172,13 @@ void board_init_r(gd_t *id, ulong dummy)
debug("Jumping to U-Boot\n");
jump_to_image_no_args();
break;
+#ifdef CONFIG_SPL_OS_BOOT
+ case IH_OS_LINUX:
+ debug("Jumping to Linux\n");
+ spl_board_prepare_for_linux();
+ jump_to_image_linux((void *)CONFIG_SYS_SPL_ARGS_ADDR);
+ break;
+#endif
default:
puts("Unsupported OS image.. Jumping nevertheless..\n");
jump_to_image_no_args();
diff --git a/include/configs/devkit8000.h b/include/configs/devkit8000.h
index 629efb0..5d1014b 100644
--- a/include/configs/devkit8000.h
+++ b/include/configs/devkit8000.h
@@ -37,7 +37,9 @@
#define CONFIG_OMAP3430 1 /* which is in a 3430 */
#define CONFIG_OMAP3_DEVKIT8000 1 /* working with DevKit8000 */
-#define CONFIG_SYS_TEXT_BASE 0x80008000
+#define CONFIG_MACH_TYPE MACH_TYPE_DEVKIT8000
+
+#define CONFIG_SYS_TEXT_BASE 0x80100000
#define CONFIG_SDRC /* The chip has SDRC controller */
@@ -329,7 +331,7 @@
#define CONFIG_SPL_MAX_SIZE 0xB400 /* 45 K */
#define CONFIG_SPL_STACK LOW_LEVEL_SRAM_STACK
-#define CONFIG_SPL_BSS_START_ADDR 0x80000000 /*CONFIG_SYS_SDRAM_BASE*/
+#define CONFIG_SPL_BSS_START_ADDR 0x80000500 /* leave space for bootargs*/
#define CONFIG_SPL_BSS_MAX_SIZE 0x80000
/* NAND boot config */
@@ -359,6 +361,9 @@
#define CONFIG_CMD_SPL_WRITE_SIZE 0x400 /* 1024 byte */
#define CONFIG_CMD_SPL_NAND_OFS (CONFIG_SYS_NAND_SPL_KERNEL_OFFS+\
0x400000)
+#define CONFIG_SPL_OS_BOOT
+#define CONFIG_SPL_OS_BOOT_KEY 26
+
#define CONFIG_SYS_NAND_SPL_KERNEL_OFFS 0x280000
#define CONFIG_SYS_SPL_ARGS_ADDR (PHYS_SDRAM_1 + 0x100)
#endif /* __CONFIG_H */
--
1.7.4.1
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