soc/amd/picasso: Reboot for recovery if no psp workbuf is found
Instead of halting if the vboot workbuf is not passed to coreboot by the
PSP, reset and reboot into recovery mode.
This process is made more difficult because if the workbuf isn't
available, we can't reboot directly into recovery - the workbuf is
needed for that process to be done through the regular calls, and we
don't want to go around the vboot API and just write into VBNV directly.
To overcome this, we set a CMOS flag, and reset the system.
PSP_verstage checks for this flag so it will update VBNV and reset the
system after generating the workbuf.
BUG=b:152638343
TEST=Simulate the workbuf not being present and verify the reboot
process.
Signed-off-by: Martin Roth <martinroth@chromium.org>
Change-Id: I049db956a5209904b274747be28ff226ce542316
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44538
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/soc/amd/picasso/Kconfig b/src/soc/amd/picasso/Kconfig
index 1b83000..642935f 100644
--- a/src/soc/amd/picasso/Kconfig
+++ b/src/soc/amd/picasso/Kconfig
@@ -505,6 +505,18 @@
Runs verstage on the PSP. Only available on
certain Chrome OS branded parts from AMD.
+config CMOS_RECOVERY_BYTE
+ hex
+ default 0x51
+ depends on VBOOT_STARTS_BEFORE_BOOTBLOCK
+ help
+ If the workbuf is not passed from the PSP to coreboot, set the
+ recovery flag and reboot. The PSP will read this byte, mark the
+ recovery request in VBNV, and reset the system into recovery mode.
+
+ This is the byte before the default first byte used by VBNV
+ (0x26 + 0x0E - 1)
+
if VBOOT_SLOTS_RW_AB && VBOOT_STARTS_BEFORE_BOOTBLOCK
config RWA_REGION_ONLY