mb/google/nissa: Disable stage cache
Although S3 is supported on nissa, only S0ix is used on user devices,
so we can ignore optimising the S3 resume time. Disable the stage
cache to save boot time at the cost on increasing the S3 resume time.
Boot time is reduced by ~6 ms. This is mostly from adding postcar to
the stage cache, which is slow since TSEG is not cached in romstage.
Adding ramstage and FSP-S take negligible time.
The S3 resume time is increased by ~89 ms total from loading and
decompressing ramstage and FSP-S.
Boot time before:
3:after RAM initialization 573,295 (931)
4:end of romstage 583,569 (10,274)
100:start of postcar 587,729 (4,160)
Boot time after:
3:after RAM initialization 571,527 (830)
4:end of romstage 575,712 (4,185)
100:start of postcar 579,866 (4,153)
S3 resume time before:
101:end of postcar 368,904 (0)
10:start of ramstage 369,165 (260)
971:loading FSP-S 385,742 (16,577)
30:device enumeration 407,105 (21,362)
S3 resume time after:
101:end of postcar 363,101 (0)
8:starting to load ramstage 363,101 (0)
15:starting LZMA decompress (ignore for x86) 382,802 (19,701)
16:finished LZMA decompress (ignore for x86) 431,620 (48,817)
9:finished loading ramstage 431,850 (230)
10:start of ramstage 431,927 (76)
971:loading FSP-S 448,357 (16,430)
17:starting LZ4 decompress (ignore for x86) 474,420 (26,062)
18:finished LZ4 decompress (ignore for x86) 474,627 (206)
BUG=b:247940538, b:192032803
TEST=Boot and S3 suspend/resume on craask
Change-Id: I8015dc0808ee19cac67c2a6573d52781c6120e8c
Signed-off-by: Reka Norman <rekanorman@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71677
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
diff --git a/src/mainboard/google/brya/Kconfig b/src/mainboard/google/brya/Kconfig
index 9f0c223..112c7df 100644
--- a/src/mainboard/google/brya/Kconfig
+++ b/src/mainboard/google/brya/Kconfig
@@ -68,6 +68,7 @@
select BOARD_ROMSIZE_KB_16384 if !BOARD_ROMSIZE_KB_32768
select CHROMEOS_DRAM_PART_NUMBER_IN_CBI if CHROMEOS
select DRIVERS_INTEL_ISH
+ select MAINBOARD_DISABLE_STAGE_CACHE
select MEMORY_SOLDERDOWN
select SOC_INTEL_ALDERLAKE_PCH_N
select SOC_INTEL_CSE_LITE_COMPRESS_ME_RW