diff options
| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2009-07-30 10:47:55 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-07-30 10:47:55 +0100 |
| commit | 0a52ac8d181e938d640c2da70cad6d1301abe775 (patch) | |
| tree | 046edf3437a49d3f6989d152bd94fcc80906b86d /arch/microblaze/kernel/head.S | |
| parent | e81b795d44ba04beab7714de65ed2e377823bd37 (diff) | |
| parent | 9b71de49b030ad8fd4d13d38571b5c42dc9ed8dd (diff) | |
Merge branch 's3c-fixes-rc4' of git://aeryn.fluff.org.uk/bjdooks/linux
Diffstat (limited to 'arch/microblaze/kernel/head.S')
| -rw-r--r-- | arch/microblaze/kernel/head.S | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/arch/microblaze/kernel/head.S b/arch/microblaze/kernel/head.S index e568d6ec621..e41c6ce2a7b 100644 --- a/arch/microblaze/kernel/head.S +++ b/arch/microblaze/kernel/head.S @@ -31,6 +31,7 @@ #include <linux/linkage.h> #include <asm/thread_info.h> #include <asm/page.h> +#include <asm/prom.h> /* for OF_DT_HEADER */ #ifdef CONFIG_MMU #include <asm/setup.h> /* COMMAND_LINE_SIZE */ @@ -54,11 +55,19 @@ ENTRY(_start) andi r1, r1, ~2 mts rmsr, r1 -/* save fdt to kernel location */ -/* r7 stores pointer to fdt blob */ - beqi r7, no_fdt_arg +/* r7 may point to an FDT, or there may be one linked in. + if it's in r7, we've got to save it away ASAP. + We ensure r7 points to a valid FDT, just in case the bootloader + is broken or non-existent */ + beqi r7, no_fdt_arg /* NULL pointer? don't copy */ + lw r11, r0, r7 /* Does r7 point to a */ + rsubi r11, r11, OF_DT_HEADER /* valid FDT? */ + beqi r11, _prepare_copy_fdt + or r7, r0, r0 /* clear R7 when not valid DTB */ + bnei r11, no_fdt_arg /* No - get out of here */ +_prepare_copy_fdt: or r11, r0, r0 /* incremment */ - ori r4, r0, TOPHYS(_fdt_start) /* save bram context */ + ori r4, r0, TOPHYS(_fdt_start) ori r3, r0, (0x4000 - 4) _copy_fdt: lw r12, r7, r11 /* r12 = r7 + r11 */ |