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soc/intel/cometlake: Enable early caching of RAMTOP region 

Enable early caching of the TOM region to optimize the boot time by
selecting `SOC_INTEL_COMMON_BASECODE_RAMTOP` config.

Purpose of this feature is to cache the TOM (with a fixed size of
16MB) for all consecutive boots even before calling into the FSP.
Otherwise, this range remains un-cached until postcar boot stage
updates the MTRR programming. FSP-M and late romstage uses this
uncached TOM range for various purposes (like relocating services
between SPI mapped cached memory to DRAM based uncache memory) hence
having the ability to cache this range beforehand would help to
optimize the boot time (more than 50ms as applicable).

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I579f85e84e0aba7f192ff81a6725d65b7f79ff75
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74517
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Sean Rhodes 2023-04-19 08:47:15 +01:00 committed by Lean Sheng Tan
parent 6e303aa89b
commit e633d37000
1 changed files with 2 additions and 1 deletions
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3
src/soc/intel/cannonlake/Kconfig
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@ -29,7 +29,8 @@ config SOC_INTEL_COMETLAKE
select PMC_IPC_ACPI_INTERFACE if DISABLE_HECI1_AT_PRE_BOOT
select SOC_INTEL_CONFIGURE_DDI_A_4_LANES
select SOC_INTEL_COMMON_BLOCK_HECI1_DISABLE_USING_PMC_IPC
select SOC_INTEL_COMMON_BASECODE if SOC_INTEL_CSE_LITE_SKU
select SOC_INTEL_COMMON_BASECODE
select SOC_INTEL_COMMON_BASECODE_RAMTOP
config SOC_INTEL_COMETLAKE_1
bool