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microblaze: Add comment about reset location

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Better to add comment to explain why reset vector points all the time to
origin U-Boot location.
If reset happens U-Boot should start from it's origin location.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/5ca6341b7487708247fe2948d7e496ea6f7c2e02.1655299267.git.michal.simek@amd.com
This commit is contained in:
Michal Simek 2022-06-24 14:15:00 +02:00
parent b6fe10afe9
commit 81169ae648
1 changed files with 1 additions and 0 deletions
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arch/microblaze/cpu/start.S
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@ -144,6 +144,7 @@ __setup_exceptions:
swi r3, r4, 0x4 /* reset address - brai opcode */ swi r3, r4, 0x4 /* reset address - brai opcode */
addik r6, r0, _start addik r6, r0, _start
/* Intentionally keep reset vector back to origin u-boot location */
sw r6, r1, r0 sw r6, r1, r0
lhu r7, r1, r10 lhu r7, r1, r10
rsubi r8, r10, 0x2 rsubi r8, r10, 0x2