[M] Change in coreboot[main]: mb/google/brox: Fix booting to kernel without battery

[Sowmya Aralguppe (Code Review)]

Attention is currently required from: Ashish Kumar Mishra, Caveh Jalali, Dinesh Gehlot, Eric Herrmann, Forest Mittelberg, Jayvik Desai, Kapil Porwal, Karthik Ramasubramanian, Keith Short, Krishna P Bhat D, Nick Vaccaro, Paul Menzel, Rishika Raj, Ronak Kanabar, Shelley Chen, Sowmya Aralguppe, Subrata Banik.

Hello Caveh Jalali, Dinesh Gehlot, Eric Herrmann, Forest Mittelberg, Jayvik Desai, Kapil Porwal, Karthik Ramasubramanian, Keith Short, Krishna P Bhat D, Nick Vaccaro, Rishika Raj, Ronak Kanabar, Shelley Chen, Subrata Banik, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/83752?usp=email

to look at the new patch set (#20).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: mb/google/brox: Fix booting to kernel without battery
......................................................................

mb/google/brox: Fix booting to kernel without battery

When battery is disconnected and only adaptor is connected higher PL2
power draw causes cpu brown out and system does not boot to kernel. To
avoid this set Boot frequency UPD to 1. Reduce PL4 value to overcome
power spikes from SoC during boot. Remove Psys implementation as it
impacts active state platform performance.

BUG=b:335046538,b:329722827
BRANCH=None
TEST=Able to successfully boot on 3 different Brox proto2 SKU1
     and SKU2 boards with 65W, 45W and 30W adaptors for 3
     iterations of cold boot.
Change-Id: I58e136c607ea9290ecac0cee453d6632760a6433
Signed-off-by: Sowmya Aralguppe 
---
M src/mainboard/google/brox/romstage.c
M src/mainboard/google/brox/variants/baseboard/brox/ramstage.c
M src/mainboard/google/brox/variants/brox/ramstage.c
M src/soc/intel/alderlake/chip.h
4 files changed, 81 insertions(+), 22 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/52/83752/20