[S] Change in coreboot[master]: security/vboot: Update vboot context with slot B absence

[Michał Żygowski (Code Review)]

Attention is currently required from: Julius Werner.

Hello Julius Werner, Yu-Ping Wu, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/75462?usp=email

to look at the new patch set (#2).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: security/vboot: Update vboot context with slot B absence
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security/vboot: Update vboot context with slot B absence

coreboot offers two vboot schemes VBOOT_SLOTS_RW_A and
VBOOT_SLOTS_RW_AB. When VBOOT_SLOTS_RW_AB is not selected then the
resulting image is rather not expected to have RW_B flash regions.
When only RW_A partition is used, vboot does additional full_reset
cycles to try RW_B, even though it does not exist / the build was not
configured for two RW partitions. To avoid it, a new vboot context
flag has been introduced, VB2_CONTEXT_ONLY_ONE_SLOT, which can be set
right after context initialization to inform vboot about absence of
slot B. This will result in less full_reset cycles when vboot runs
out of available slots and cause vboot to switch to recovery mode
faster.

Signed-off-by: Michał Żygowski 
Change-Id: Ie123881a2f9f766ae65e4ac7c36bc2a8fce8d100
---
M src/security/vboot/vboot_logic.c
1 file changed, 18 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/62/75462/2