diff options
Diffstat (limited to 'src/soc')
| -rw-r--r-- | src/soc/intel/common/block/cpu/car/cache_as_ram.S | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/cpu/car/cache_as_ram.S b/src/soc/intel/common/block/cpu/car/cache_as_ram.S index 29bd3fe87f..74957aba9f 100644 --- a/src/soc/intel/common/block/cpu/car/cache_as_ram.S +++ b/src/soc/intel/common/block/cpu/car/cache_as_ram.S @@ -221,6 +221,23 @@ setup_car_mtrr: is_bootguard_nem jz no_bootguard_car_continue + /* + * With Bootguard some RO caching of the flash is already set up by + * the ACM. It looks like in such a setup 'clear_car' will not properly fill + * the cachelines. Fill all the CAR cachelines explicitly using sfence. + * This assumes 64 bytes cachelines. + */ + movl $CONFIG_DCACHE_RAM_BASE, %edi + movl $CONFIG_DCACHE_RAM_SIZE, %ecx + shr $0x06, %ecx + xor %eax, %eax + +1: + movl %eax, (%edi) + sfence + add $64, %edi + loop 1b + clear_car jmp car_init_done |