[U-Boot-Users] [PATCH] Fill fw_arg3

[Florian Fainelli]

Hello,

This patch allows MIPS based Linux kernels to do runtime bootloader detection 
by reading Linux's fw_arg3 in the PROM code (for instance) filled with the 
magic number "UBOO". This may not be really useful for other boards than MIPS 
and in particular those that use several different bootloaders (like 
ADM5120).

Signed-off-by: Florian Fainelli <florian.fainelli at telecomint.eu>
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diff --git a/lib_mips/mips_linux.c b/lib_mips/mips_linux.c
index 952d5a9..0823bc0 100644
--- a/lib_mips/mips_linux.c
+++ b/lib_mips/mips_linux.c
@@ -33,6 +33,8 @@ DECLARE_GLOBAL_DATA_PTR;
 #define	LINUX_MAX_ENVS		256
 #define	LINUX_MAX_ARGS		256
 
+#define UBOOT_MAGIC_NUMBER	0x55424F4F	/* UBOO */
+
 #ifdef CONFIG_SHOW_BOOT_PROGRESS
 # include <status_led.h>
 # define SHOW_BOOT_PROGRESS(arg)	show_boot_progress(arg)
@@ -213,7 +215,7 @@ void do_bootm_linux (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[],
 	/* we assume that the kernel is in place */
 	printf ("\nStarting kernel ...\n\n");
 
-	theKernel (linux_argc, linux_argv, linux_env, 0);
+	theKernel (linux_argc, linux_argv, linux_env, UBOOT_MAGIC_NUMBER);
 }
 
 static void linux_params_init (ulong start, char *line)
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