diff options
| author | Rob Barnes <robbarnes@google.com> | 2020-10-01 15:08:38 -0600 |
|---|---|---|
| committer | Paul Fagerburg <pfagerburg@chromium.org> | 2020-10-08 22:22:32 +0000 |
| commit | 481ab24f46fc3e15b501d0aeb0e494b9cbd390d6 (patch) | |
| tree | 29cc487a6a969007156e630d5150918262f58a0c /src | |
| parent | 7e6ee912c689d01b36735db7d893a35916f01c96 (diff) | |
| download | coreboot-481ab24f46fc3e15b501d0aeb0e494b9cbd390d6.tar.xz | |
mb/google/zork/morphius: 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 on morphius with and without patch, confirm ~7ms improvement
BRANCH=zork
Signed-off-by: Rob Barnes <robbarnes@google.com>
Change-Id: I7f6efd3d5839f154f2487a07654be8e35634bbbc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45932
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/mainboard/google/zork/variants/morphius/overridetree.cb | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mainboard/google/zork/variants/morphius/overridetree.cb b/src/mainboard/google/zork/variants/morphius/overridetree.cb index 41e1c70a74..43a94390a3 100644 --- a/src/mainboard/google/zork/variants/morphius/overridetree.cb +++ b/src/mainboard/google/zork/variants/morphius/overridetree.cb @@ -50,6 +50,12 @@ 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 |