drivers/mrc_cache: Prevent printing errors in expected use cases

The following are considered "expected" situations, where we shouldn't
print error messages as in other unexpected errors:

1. When the previous boot is in recovery mode, under certain config
   combination the normal MRC cache would have been invalidated.
   Therefore the "couldn't read metadata" error is expected to show in
   the current normal boot. Special-case this situation by printing a
   different message.
2. If the platform doesn't have recovery cache (!HAS_RECOVERY_MRC_CACHE)
   and vboot starts before romstage (!VBOOT_STARTS_IN_ROMSTAGE), then
   there should be no region for recovery cache. In this case, "failed
   to locate region type 0" will be shown. Since it's pretty clear from
   the code that this is the only case for the error to happen, simply
   change it to BIOS_DEBUG. Also remove a duplicate message when
   mrc_header_valid() fails.

BUG=b:257401937
TEST=emerge-corsola coreboot
TEST=Ran `cbmem -1 | grep ERROR` in recovery boot
TEST=Ran `cbmem -1 | grep ERROR` in normal boot following recovery boot
BRANCH=corsola

Change-Id: Ia942eeecaca3f6b2b90bac725279d2dc6174e0fd
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69542
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions