diff options
| author | Subrata Banik <subratabanik@google.com> | 2022-06-15 21:03:42 +0530 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2022-06-17 16:07:35 +0000 |
| commit | 56d3103f6e0cc2bd0968ed5c34fe9b0d7b6ddc04 (patch) | |
| tree | 2ea05204739cdd38bd450df6fff2f82d4e3071b0 /src/cpu/intel | |
| parent | 8cd1dfa4ae98a11300113582647552a242cf991b (diff) | |
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>
Diffstat (limited to 'src/cpu/intel')
| -rw-r--r-- | src/cpu/intel/microcode/microcode.c | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/src/cpu/intel/microcode/microcode.c b/src/cpu/intel/microcode/microcode.c index beadb489de..469bd25496 100644 --- a/src/cpu/intel/microcode/microcode.c +++ b/src/cpu/intel/microcode/microcode.c @@ -79,15 +79,10 @@ void intel_microcode_load_unlocked(const void *microcode_patch) current_rev = read_microcode_rev(); - /* - * No use loading the same revision unless RELOAD_MICROCODE_PATCH - * config is selected. - */ - if (!CONFIG(RELOAD_MICROCODE_PATCH) && (current_rev == m->rev)) { + /* No use loading the same revision. */ + if (current_rev == m->rev) { printk(BIOS_INFO, "microcode: Update skipped, already up-to-date\n"); return; - } else { - printk(BIOS_INFO, "microcode: Re-load microcode patch\n"); } #if ENV_RAMSTAGE |