[S] Change in coreboot[master]: soc/intel/alderlake: Enable early caching of RAMTOP region

[Lean Sheng Tan (Code Review)]

Lean Sheng Tan has submitted this change. ( https://review.coreboot.org/c/coreboot/+/73736 )

(

8 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: soc/intel/alderlake: Enable early caching of RAMTOP region
......................................................................

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 
Change-Id: Iba554af4ff0896e133d20860ff72dd1a10ebd1e3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73736
Reviewed-by: Subrata Banik 
Reviewed-by: Sean Rhodes 
Tested-by: build bot (Jenkins) 
Reviewed-by: Maximilian Brune 
---
M src/soc/intel/alderlake/Kconfig
1 file changed, 31 insertions(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Sean Rhodes: Looks good to me, approved
  Subrata Banik: Looks good to me, approved
  Maximilian Brune: Looks good to me, but someone else must approve

diff --git a/src/soc/intel/alderlake/Kconfig b/src/soc/intel/alderlake/Kconfig
index 480ee0b..0913480 100644
--- a/src/soc/intel/alderlake/Kconfig
+++ b/src/soc/intel/alderlake/Kconfig
@@ -83,6 +83,8 @@
    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 @@
    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