Hi Florian,
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@telecomint.eu
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)
I know U-Boot is magic - but why have more than needed?
[dzu@pollux u-boot]$ grep IH_MAGIC include/* include/image.h:#define IH_MAGIC 0x27051956 /* Image Magic Number */ [dzu@pollux u-boot]$ grep 27051956 /usr/share/magic 0 belong 0x27051956 u-boot/PPCBoot image
Cheers Detlev