This patch to ensure that coreboot is able to store memory
training data into SPI and perform platform lockdown after
PCI enumeration is done before handing over control to
NotifyPhase() - Post PCI enumeration.
Modified coreboot bootstate execution order below:
BS_DEV_ENUMERATE - BS_ON_EXIT - Store Memory training data into SPI
BS_DEV_RESOURCES - BS_ON_EXIT - Platform Lock Down after PCI enumeration
BS_DEV_ENABLE - BS_ON_ENTRY - NotifyPhase() post PCI enumeration
TEST=Please find test case and results for Chrome Devices as Apollolake- Reef,
Kabylake-Eve and Poppy and Non Chrome Devices with Yocto OS.
1.
Without patches
Cold Boot
MRC: no data in 'RW_MRC_CACHE'
...
MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: no data in 'RW_MRC_CACHE'
MRC: cache data 'RW_MRC_CACHE' needs update.
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.
Warm Reboot from Chrome CMD Line: $ reboot
MRC cache found, size 18c8 bootmode:2
...
MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.
Suspend Stress from Chrome CMD Line: $ echo mem > /sys/power/state
MRC cache found, size 18c8 bootmode:17
...
MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.
2.
With patches
Cold Boot
MRC: no data in 'RW_MRC_CACHE'
...
MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: no data in 'RW_MRC_CACHE'
MRC: cache data 'RW_MRC_CACHE' needs update.
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.
Warm Reboot from Yocto CMD Line: $ reboot
MRC cache found, size 18c8 bootmode:2
...
MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.
Suspend Stress from Chrome CMD Line: $ echo mem > /sys/power/state
MRC cache found, size 18c8 bootmode:17
...
MRC: Checking cached data update for 'RW_MRC_CACHE'.
SF: Detected FAST_SPI Hardware Sequencer with sector size 0x1000, total 0x1000000
MRC: NOT enabling PRR for 'UNIFIED_MRC_CACHE'.
Tested the patches more thoroughly, from the S5->S0, S3->S0 bootlog there
is no noticeable difference.
On a reboot, suspend resume from Chrome console, the mrc cache is found,
and utilized.
Change-Id: I4cb4eac5256c1ce98f51adad0be6e69f7d05d8e1
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/21084
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
3f3025d7f1