diff options
Diffstat (limited to 'src/soc/amd')
| -rw-r--r-- | src/soc/amd/common/block/cpu/Kconfig | 8 | ||||
| -rw-r--r-- | src/soc/amd/common/block/cpu/car/exit_car.S | 3 |
2 files changed, 7 insertions, 4 deletions
diff --git a/src/soc/amd/common/block/cpu/Kconfig b/src/soc/amd/common/block/cpu/Kconfig index 86cc77194c..5941599df0 100644 --- a/src/soc/amd/common/block/cpu/Kconfig +++ b/src/soc/amd/common/block/cpu/Kconfig @@ -3,6 +3,8 @@ config SOC_AMD_COMMON_BLOCK_CAR default n help This option allows the SOC to use a standard AMD cache-as-ram (CAR) - implementation. CAR setup is built into bootblock and teardown in - romstage. If it is not used the system must implement these functions - separately. + implementation. CAR setup is built into bootblock and teardown is + in postcar. The teardown procedure does not preserve the stack so + it may not be appropriate for a romstage implementation without + additional consideration. If this option is not used, the SOC must + implement these functions separately. diff --git a/src/soc/amd/common/block/cpu/car/exit_car.S b/src/soc/amd/common/block/cpu/car/exit_car.S index ac36cb0e4f..f9d056e599 100644 --- a/src/soc/amd/common/block/cpu/car/exit_car.S +++ b/src/soc/amd/common/block/cpu/car/exit_car.S @@ -20,6 +20,7 @@ .globl chipset_teardown_car chipset_teardown_car: + pop %esp /* Disable cache */ movl %cr0, %eax @@ -33,4 +34,4 @@ chipset_teardown_car: andl $(~(CR0_CD | CR0_NW)), %eax movl %eax, %cr0 - ret + jmp *%esp |