tree 6dcf06cff12b67c7a7f13f834fe2c2b82c3e2b35
parent e310c7747ac8dadb49f008eb0196217d1a219740
author Felix Held <felix-coreboot@felixheld.de> 1598369261 +0200
committer Felix Held <felix-coreboot@felixheld.de> 1601501933 +0000

mb/amd/mandolin: change EFS SPI mode from 1-4-4 to 1-1-4

With this change the flash addresses will only get transferred over one
data pin like in the non-quad SPI mode and only the data will get sent
over all four data pins. Since this gives the flash chip a bit more time
to fetch the data the host requested, this allows higher SPI frequencies
resulting in a higher throughput when bigger chunks of memory get read.

BRANCH=zork

Change-Id: Iad4c922ffcdba4b17e6e81244ff37302eb171d97
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45831
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>