From: Alistair Buxton <[email protected]> This patch adapts the bootm command so that it can use an existing atags command set up by a previous bootloader. If the environment variable "atags" is unset, bootm behaves as normal. If "atags" is set, bootm will skip all boot args setup entirely, and pass the address found in "atags". For example, if a previous boot loader already set up the atags struct at 0x80000100:
setenv atags 0x80000100; bootm 0x80008000 Signed-off-by: Alistair Buxton <[email protected]> --- arch/arm/lib/bootm.c | 37 ++++++++++++++++++++++++++++--------- 1 files changed, 28 insertions(+), 9 deletions(-) diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c index 802e833..262efda 100644 --- a/arch/arm/lib/bootm.c +++ b/arch/arm/lib/bootm.c @@ -100,6 +100,13 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) int machid = bd->bi_arch_number; void (*kernel_entry)(int zero, int arch, uint params); +#ifdef CONFIG_CHAINLOADER + uint params; + #define PARAMS params +#else + #define PARAMS (bd->bi_boot_params) +#endif + #ifdef CONFIG_CMDLINE_TAG char *commandline = getenv ("bootargs"); #endif @@ -125,34 +132,46 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) debug ("## Transferring control to Linux (at address %08lx) ...\n", (ulong) kernel_entry); +#ifdef CONFIG_CHAINLOADER + s = getenv ("atags"); + if (s) { + params = simple_strtoul (s, NULL, 16); + printf ("Using existing atags at 0x%x\n", params); + } else { +#endif + #if defined (CONFIG_SETUP_MEMORY_TAGS) || \ defined (CONFIG_CMDLINE_TAG) || \ defined (CONFIG_INITRD_TAG) || \ defined (CONFIG_SERIAL_TAG) || \ defined (CONFIG_REVISION_TAG) - setup_start_tag (bd); + setup_start_tag (bd); #ifdef CONFIG_SERIAL_TAG - setup_serial_tag (¶ms); + setup_serial_tag (¶ms); #endif #ifdef CONFIG_REVISION_TAG - setup_revision_tag (¶ms); + setup_revision_tag (¶ms); #endif #ifdef CONFIG_SETUP_MEMORY_TAGS - setup_memory_tags (bd); + setup_memory_tags (bd); #endif #ifdef CONFIG_CMDLINE_TAG - setup_commandline_tag (bd, commandline); + setup_commandline_tag (bd, commandline); #endif #ifdef CONFIG_INITRD_TAG - if (images->rd_start && images->rd_end) - setup_initrd_tag (bd, images->rd_start, images->rd_end); + if (images->rd_start && images->rd_end) + setup_initrd_tag (bd, images->rd_start, images->rd_end); +#endif + setup_end_tag(bd); #endif - setup_end_tag(bd); + +#ifdef CONFIG_CHAINLOADER + } #endif announce_and_cleanup(); - kernel_entry(0, machid, bd->bi_boot_params); + kernel_entry(0, machid, PARAMS); /* does not return */ return 1; -- 1.7.4.1 _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
