config SOC_AMD_COMMON_BLOCK_CAR bool 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 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. This is only used for AMD CPU before family 17h. From family 17h on the RAM is already initialized by the PSP before the x86 cores are released from reset. config SOC_AMD_COMMON_BLOCK_NONCAR bool default n help From family 17h on AMD CPUs/APUs don't use cache as RAM (CAR) any more, since the RAM initialization is already done by the PSP when the x86 cores are released from reset. if SOC_AMD_COMMON_BLOCK_NONCAR config MEMLAYOUT_LD_FILE string default "src/soc/amd/common/block/cpu/noncar/memlayout.ld" endif # SOC_AMD_COMMON_BLOCK_NONCAR