tree 2ea05204739cdd38bd450df6fff2f82d4e3071b0
parent 8cd1dfa4ae98a11300113582647552a242cf991b
author Subrata Banik <subratabanik@google.com> 1655307222 +0530
committer Felix Held <felix-coreboot@felixheld.de> 1655482055 +0000

cpu/intel/microcode: Fix `device enumeration` boot regression

Prior commit hash 0310d34c2 (cpu/intel/microcode: Have provision to
re-load microcode patch) introduces an option to reload the microcode
based on SoC selecting RELOAD_MICROCODE_PATCH config.

This patch might potentially introduce a boot time regression (~30ms)
when RELOAD_MICROCODE_PATCH kconfig is enabled as all cores might end up
reloading the microcode without the proper need.

Note: RELOAD_MICROCODE_PATCH kconfig is not yet selected by any SoC
hence, it doesn't impact any coreboot project.

The idea is reloading microcode depends on specific use case
(for example: Skip FSP doing MP Init from Alder Lake onwards) hence,
a follow up patch will create a newer API to allow reloading of
microcode when RELOAD_MICROCODE_PATCH config is enabled.

BUG=b:233199592
TEST=Build and boot google/kano to ChromeOS.

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: Ie320153d25cefe153fc8a67db447384f1f20f31f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65155
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>