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coreboot: check Cr50 PM mode on normal boot

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Under some scenarios the key ladder on the Cr50 can get disabled.  If
this state is detected, trigger a reboot of the Cr50 to restore full
TPM functionality.

BUG=b:121463033
BRANCH=none
TEST=Built coreboot on sarien and grunt platforms.
TEST=Ran 'gsctool -a -m disable' and reboot. Verified coreboot sends
VENDOR_CC_IMMEDIATE_RESET command to Cr50 and that the Cr50 resets and
then the platform boots normally.
TEST=Performed Cr50 rollback to 0.0.22 which does not support the
VENDOR_CC_TPM_MODE command, confirmed that platform boots normally and
the coreboot log captures the unsupported command.
Tested-by: Keith Short <keithshort@chromium.org>

Change-Id: I70e012efaf1079d43890e909bc6b5015bef6835a
Signed-off-by: Keith Short <keithshort@chromium.org>
Reviewed-on: https://review.coreboot.org/c/31260
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Keith Short
2019-02-05 16:15:10 -07:00
committed by Patrick Georgi
parent 91be00ef1b
commit e0f3400547
9 changed files with 247 additions and 20 deletions
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7
src/vendorcode/google/chromeos/chromeos.h
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@@ -33,8 +33,11 @@ static inline void mark_watchdog_tombstone(void) { return; }
static inline void reboot_from_watchdog(void) { return; }
#endif /* CONFIG_CHROMEOS */
/* Defined as weak function in cr50_enable_update.c */
void mainboard_cr50_update_reset(void);
/**
* Perform any platform specific actions required prior to resetting the Cr50.
* Defined as weak function in cr50_enable_update.c
*/
void mainboard_prepare_cr50_reset(void);
struct romstage_handoff;