When U-Boot starts stack protection can be already enabled that's why setup the lowest possible SLR value which is address 0. And the highest possible stack in front of U-Boot. That's why you should never load U-Boot to the beginning of DDR. There must be some space reserved. Code is using this location for early malloc space, early global data and stack.
Signed-off-by: Michal Simek michal.simek@amd.com ---
arch/microblaze/cpu/start.S | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/microblaze/cpu/start.S b/arch/microblaze/cpu/start.S index 9e00eef1f4b6..715ef37b39d9 100644 --- a/arch/microblaze/cpu/start.S +++ b/arch/microblaze/cpu/start.S @@ -15,8 +15,9 @@ _start: mts rmsr, r0 /* disable cache */
- addi r8, r0, _end - mts rslr, r8 + mts rslr, r0 + addi r8, r0, _start + mts rshr, r8
#if defined(CONFIG_SPL_BUILD) addi r1, r0, CONFIG_SPL_STACK_ADDR