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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>
This commit is contained in:
Rob Barnes 2020-10-01 15:03:25 -06:00 committed by Paul Fagerburg
parent 0a304f65a2
commit 60d4f2411c
1 changed files with 6 additions and 0 deletions
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6
src/mainboard/google/zork/variants/berknip/overridetree.cb
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@ -38,6 +38,12 @@ chip soc/amd/picasso
.early_init = true, .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. # See AMD 55570-B1 Table 13: PCI Device ID Assignments.
device domain 0 on device domain 0 on
subsystemid 0x1022 0x1510 inherit subsystemid 0x1022 0x1510 inherit