soc/intel/alderlake: 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).

TEST=Able to build and boot Starlab ADL laptop to OS.

Signed-off-by: Lean Sheng Tan <sheng.tan@9elements.com>
Change-Id: Iba554af4ff0896e133d20860ff72dd1a10ebd1e3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73736
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/soc/intel/alderlake/Kconfig b/src/soc/intel/alderlake/Kconfig
index 480ee0b8c4..09134805b8 100644
--- a/src/soc/intel/alderlake/Kconfig
+++ b/src/soc/intel/alderlake/Kconfig
@@ -83,6 +83,8 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_INTEL_COMMON
 	select CPU_INTEL_COMMON_VOLTAGE
 	select SOC_INTEL_COMMON_ACPI_WAKE_SOURCE
+	select SOC_INTEL_COMMON_BASECODE
+	select SOC_INTEL_COMMON_BASECODE_RAMTOP
 	select SOC_INTEL_COMMON_BLOCK
 	select SOC_INTEL_COMMON_BLOCK_ACPI
 	select SOC_INTEL_COMMON_BLOCK_ACPI_CPPC
@@ -118,7 +120,6 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_INTEL_COMMON_BLOCK_VTD
 	select SOC_INTEL_COMMON_BLOCK_XHCI
 	select SOC_INTEL_COMMON_BLOCK_XHCI_ELOG
-	select SOC_INTEL_COMMON_BASECODE
 	select SOC_INTEL_COMMON_FSP_RESET
 	select SOC_INTEL_COMMON_PCH_CLIENT
 	select SOC_INTEL_COMMON_RESET