From 62e79d2c1ed6a52092b6912ccd477dd97b7c00e0 Mon Sep 17 00:00:00 2001
From: Shelley Chen <shchen@google.com>
Date: Fri, 4 Oct 2019 12:38:47 -0700
Subject: 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>
---
src/mainboard/google/hatch/chromeos.fmd | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
(limited to 'src')
diff --git a/src/mainboard/google/hatch/chromeos.fmd b/src/mainboard/google/hatch/chromeos.fmd
index 393ac808b5..45dbc81716 100644
--- a/src/mainboard/google/hatch/chromeos.fmd
+++ b/src/mainboard/google/hatch/chromeos.fmd
@@ -19,7 +19,7 @@ FLASH@0xfe000000 0x2000000 {
RW_FWID_B@0x3dffc0 0x40
}
RW_MISC@0x17c0000 0x40000 {
- UNIFIED_MRC_CACHE@0x0 0x30000 {
+ UNIFIED_MRC_CACHE(PRESERVE)@0x0 0x30000 {
RECOVERY_MRC_CACHE@0x0 0x10000
RW_MRC_CACHE@0x10000 0x20000
}
--
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