tree f3a97eeab4cef4f8d64319e6d60203768a53d320
parent faaa7597631f35a3299846f77a6d20076c16bde9
author Karthikeyan Ramasubramanian <kramasub@google.com> 1648770648 -0600
committer Felix Held <felix-coreboot@felixheld.de> 1648911028 +0000

mb/google/skyrim: Fix ESPI communication issues

* Use dedicated ALERT pin to resolve NO_RESPONSE error/status while
getting target configuration.
* Configure the ESPI to operate at 16 MHZ since operating at 33 MHz
causes boot stall.

BUG=b:226635441
TEST=Build and Boot to OS in Skyrim. Ensure that EC <-> AP communication
is working fine through Host Command debug logs in EC console, ectool
version command.

Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Change-Id: I951afdada8ee4f917cdeba8e287e5a2ae77c97ee
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63286
Reviewed-by: Jon Murphy <jpmurphy@google.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>