[coreboot-gerrit] Change in coreboot[master]: cpu/intel/car: Make stack guards more useful on C_ENV_BOOTBLOCK

[Kyösti Mälkki (Code Review)]

Kyösti Mälkki has uploaded a new patch set (#6) to the change originally created by Arthur Heymans. ( https://review.coreboot.org/c/coreboot/+/34976 )

Change subject: cpu/intel/car: Make stack guards more useful on C_ENV_BOOTBLOCK
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cpu/intel/car: Make stack guards more useful on C_ENV_BOOTBLOCK

With C_ENVIRONMENT_BOOTBLOCK, CONFIG_DCACHE_BSP_STACK_SIZE needs to be
set to define a stack region that can be shared over all stages using
CAR. It makes sense to use that Kconfig option's value instead of a
hardcoded value. This will result in less false positives when the
stack size is big, for instance with FSP using the coreboot stack.

In many configurations with C_ENVIRONMENT_BOOTBLOCK the stack_base is
at the base of CAR. If the stack grows too large it operates out of
CAR, typically resulting in a hang. Therefore the stack guards are
extended to cover 256 bytes at the base to at least provide a warning
when the romstage is dangerously close of running out of stack.

Change-Id: I2ce1dda4d1f254e6c36de4d3fea26e12c34195ff
Signed-off-by: Arthur Heymans 
Signed-off-by: Kyösti Mälkki 
---
M src/cpu/intel/car/romstage.c
1 file changed, 7 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/76/34976/6