diff options
Diffstat (limited to 'arch/microblaze/kernel/head.S')
| -rw-r--r-- | arch/microblaze/kernel/head.S | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/microblaze/kernel/head.S b/arch/microblaze/kernel/head.S index 42434008209e..0db20b5abb54 100644 --- a/arch/microblaze/kernel/head.S +++ b/arch/microblaze/kernel/head.S | |||
| @@ -77,8 +77,18 @@ real_start: | |||
| 77 | We ensure r7 points to a valid FDT, just in case the bootloader | 77 | We ensure r7 points to a valid FDT, just in case the bootloader |
| 78 | is broken or non-existent */ | 78 | is broken or non-existent */ |
| 79 | beqi r7, no_fdt_arg /* NULL pointer? don't copy */ | 79 | beqi r7, no_fdt_arg /* NULL pointer? don't copy */ |
| 80 | lw r11, r0, r7 /* Does r7 point to a */ | 80 | /* Does r7 point to a valid FDT? Load HEADER magic number */ |
| 81 | rsubi r11, r11, OF_DT_HEADER /* valid FDT? */ | 81 | /* Run time Big/Little endian platform */ |
| 82 | /* Save 1 as word and load byte - 0 - BIG, 1 - LITTLE */ | ||
| 83 | addik r11, r0, 0x1 /* BIG/LITTLE checking value */ | ||
| 84 | /* __bss_start will be zeroed later - it is just temp location */ | ||
| 85 | swi r11, r0, TOPHYS(__bss_start) | ||
| 86 | lbui r11, r0, TOPHYS(__bss_start) | ||
| 87 | beqid r11, big_endian /* DO NOT break delay stop dependency */ | ||
| 88 | lw r11, r0, r7 /* Big endian load in delay slot */ | ||
| 89 | lwr r11, r0, r7 /* Little endian load */ | ||
| 90 | big_endian: | ||
| 91 | rsubi r11, r11, OF_DT_HEADER /* Check FDT header */ | ||
| 82 | beqi r11, _prepare_copy_fdt | 92 | beqi r11, _prepare_copy_fdt |
| 83 | or r7, r0, r0 /* clear R7 when not valid DTB */ | 93 | or r7, r0, r0 /* clear R7 when not valid DTB */ |
| 84 | bnei r11, no_fdt_arg /* No - get out of here */ | 94 | bnei r11, no_fdt_arg /* No - get out of here */ |