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baytrail: mrc_cache: check region erased before erasing 

On a firmware update the MRC cache is destroyed. On the
subsequent boot the MRC region was attempted to be erased
even if it was already erased. This led to spi part taking
longer than it should have for an unnecessary erase
operation. Therefore, check that the region is erased
before issuing the erease command.

BUG=chrome-os-partner:24916
BRANCH=baytrail
TEST=Booted after chromeos-firmeareupdate. Noted no
     error messages in this path.

Change-Id: I6fadeb6bc5fc178abb0a7e3f0898855e481add2e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/182153
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/5043
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
This commit is contained in:
Aaron Durbin 2014-01-13 11:34:51 -06:00 committed by Kyösti Mälkki
parent 58d6e18f0c
commit 931e590745
1 changed files with 6 additions and 3 deletions
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5
src/soc/intel/baytrail/mrc_cache.c
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@ -275,10 +275,13 @@ static void update_mrc_cache(void *unused)
next_slot = mrc_cache_next_slot(&region, current_saved);
if (!mrc_slot_valid(&region, next_slot, current_boot)) {
printk(BIOS_DEBUG, "Slot @ %p is invalid.\n", next_slot);
if (!nvm_is_erased(region.base, region.size)) {
if (nvm_erase(region.base, region.size) < 0) {
printk(BIOS_DEBUG, "Could not erase MRC region.\n");
printk(BIOS_DEBUG, "Failure erasing region.\n");
return;
}
}
next_slot = region.base;
}