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mb/google/hatch: Preserve MRC training data across FW update 

Add PRESERVE to UNIFIED_MRC_CACHE so that we don't retain the memory
training data upon a FW update unless we need to.  We have had users
complaining that a 15 second memory training upon update makes them
believe that their device is not booting, thus many of them hard
resetting before bootup.

BUG=b:142084637
BRANCH=None
TEST=flash RW_SECTION_A, RW_SECTION_B, and WP_RO sections and make
     sure memory training doesn't occur on following bootup.

Change-Id: Ia5eb228b1f665a8371982544723dab3dfc40d401
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35803
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Shelley Chen 2019-10-04 12:38:47 -07:00
parent 4e07adbb86
commit 62e79d2c1e
1 changed files with 1 additions and 1 deletions
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src/mainboard/google/hatch/chromeos.fmd
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@ -19,7 +19,7 @@ FLASH@0xfe000000 0x2000000 {
RW_FWID_B@0x3dffc0 0x40 RW_FWID_B@0x3dffc0 0x40
} }
RW_MISC@0x17c0000 0x40000 { RW_MISC@0x17c0000 0x40000 {
UNIFIED_MRC_CACHE@0x0 0x30000 { UNIFIED_MRC_CACHE(PRESERVE)@0x0 0x30000 {
RECOVERY_MRC_CACHE@0x0 0x10000 RECOVERY_MRC_CACHE@0x0 0x10000
RW_MRC_CACHE@0x10000 0x20000 RW_MRC_CACHE@0x10000 0x20000
} }