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authorRob Barnes <robbarnes@google.com>2020-10-01 15:03:25 -0600
committerPaul Fagerburg <pfagerburg@chromium.org>2020-10-08 22:43:13 +0000
commit60d4f2411c93f5ee3b07b8978cfc282688536a65 (patch)
treef0749fa57e8e8cfb1171da5f068e04cebc9b782b /src/mainboard/google
parent0a304f65a2f628651476e28ddce0c56eb9a263ae (diff)
downloadcoreboot-60d4f2411c93f5ee3b07b8978cfc282688536a65.tar.xz
mb/google/zork/berknip: Increase eMMC initial clock frequency
This will reduce boot time by 7ms. Some of the initial designs don't have a pull-up resistor on the CMD line. These designs still boot at 400 kHz despite not having the pull-up. BUG=b:158766134 TEST=Boot Berknip w/ eMMC to OS. BRANCH=zork Change-Id: I5d55f55b8208b4dc3fbdc9d1ec6333f9e211e3fd Signed-off-by: Rob Barnes <robbarnes@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/45931 Reviewed-by: Raul Rangel <rrangel@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard/google')
-rw-r--r--src/mainboard/google/zork/variants/berknip/overridetree.cb6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mainboard/google/zork/variants/berknip/overridetree.cb b/src/mainboard/google/zork/variants/berknip/overridetree.cb
index 95629392e3..674d5574be 100644
--- a/src/mainboard/google/zork/variants/berknip/overridetree.cb
+++ b/src/mainboard/google/zork/variants/berknip/overridetree.cb
@@ -38,6 +38,12 @@ chip soc/amd/picasso
.early_init = true,
}"
+ register "emmc_config" = "{
+ .timing = SD_EMMC_EMMC_HS400,
+ .sdr104_hs400_driver_strength = SD_EMMC_DRIVE_STRENGTH_A,
+ .init_khz_preset = 400,
+ }"
+
# See AMD 55570-B1 Table 13: PCI Device ID Assignments.
device domain 0 on
subsystemid 0x1022 0x1510 inherit