Raul Rangel has uploaded this change for review.
mb/google/zork/ezkinil: Increase eMMC initial clock frequency
This will reduce boot time by over 30ms. 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 Ezkinil w/ eMMC to OS.
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Ida0bbf9bd772ab7d384d5d097fa3b02b846a3efa
---
M src/mainboard/google/zork/variants/ezkinil/overridetree.cb
1 file changed, 6 insertions(+), 0 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/52/45852/1
diff --git a/src/mainboard/google/zork/variants/ezkinil/overridetree.cb b/src/mainboard/google/zork/variants/ezkinil/overridetree.cb
index 614d6ab..b0204de 100644
--- a/src/mainboard/google/zork/variants/ezkinil/overridetree.cb
+++ b/src/mainboard/google/zork/variants/ezkinil/overridetree.cb
@@ -39,6 +39,12 @@
.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
To view, visit change 45852. To unsubscribe, or for help writing mail filters, visit settings.