diff options
| author | Grant Likely <grant.likely@secretlab.ca> | 2008-03-19 04:07:43 +1100 |
|---|---|---|
| committer | Josh Boyer <jwboyer@linux.vnet.ibm.com> | 2008-04-02 20:36:11 -0500 |
| commit | d2477b5cc8ca95b8c15133ffbbebf0bd9783f560 (patch) | |
| tree | bd0dd171e8614634b97fc3e02d22fe0152d308b4 /arch/powerpc/boot/virtex405-head.S | |
| parent | 19a74263f49dce2b96e2213f7f4c029cedbbf0ce (diff) | |
[POWERPC] bootwrapper: Add a firmware-independent simpleboot target.
This target produces a flat binary rather than an ELF file,
fixes the entry point at the beginning of the image, and takes
a complete device tree with no fixups needed.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Diffstat (limited to 'arch/powerpc/boot/virtex405-head.S')
| -rw-r--r-- | arch/powerpc/boot/virtex405-head.S | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/powerpc/boot/virtex405-head.S b/arch/powerpc/boot/virtex405-head.S new file mode 100644 index 000000000000..3edb13f94669 --- /dev/null +++ b/arch/powerpc/boot/virtex405-head.S @@ -0,0 +1,30 @@ +#include "ppc_asm.h" + + .text + .global _zimage_start +_zimage_start: + + /* PPC errata 213: needed by Virtex-4 FX */ + mfccr0 0 + oris 0,0,0x50000000@h + mtccr0 0 + + /* + * Invalidate the data cache if the data cache is turned off. + * - The 405 core does not invalidate the data cache on power-up + * or reset but does turn off the data cache. We cannot assume + * that the cache contents are valid. + * - If the data cache is turned on this must have been done by + * a bootloader and we assume that the cache contents are + * valid. + */ + mfdccr r9 + cmplwi r9,0 + bne 2f + lis r9,0 + li r8,256 + mtctr r8 +1: dccci r0,r9 + addi r9,r9,0x20 + bdnz 1b +2: b _zimage_start_lib |