Paul Fagerburg submitted this change.
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>
---
M src/mainboard/google/zork/variants/morphius/overridetree.cb
1 file 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 41e1c70..43a9439 100644
--- a/src/mainboard/google/zork/variants/morphius/overridetree.cb
+++ b/src/mainboard/google/zork/variants/morphius/overridetree.cb
@@ -50,6 +50,12 @@
.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
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