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microblaze: Clear print messages for DTB passing via r7 

It is necessary to zeroed r7 when r7 points to bad
dtb - this caused that we have correct messages
about compiled-in dtb or passing via r7

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2009-06-22 12:31:55 +02:00
parent a69cb8c466
commit ea3fd1466f
1 changed files with 3 additions and 0 deletions
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3
arch/microblaze/kernel/head.S
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@ -62,7 +62,10 @@ ENTRY(_start)
beqi r7, no_fdt_arg /* NULL pointer? don't copy */ beqi r7, no_fdt_arg /* NULL pointer? don't copy */
lw r11, r0, r7 /* Does r7 point to a */ lw r11, r0, r7 /* Does r7 point to a */
rsubi r11, r11, OF_DT_HEADER /* valid FDT? */ 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 */ bnei r11, no_fdt_arg /* No - get out of here */
_prepare_copy_fdt:
or r11, r0, r0 /* incremment */ or r11, r0, r0 /* incremment */
ori r4, r0, TOPHYS(_fdt_start) ori r4, r0, TOPHYS(_fdt_start)
ori r3, r0, (0x4000 - 4) ori r3, r0, (0x4000 - 4)