erebion/coreboot
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

mb/google/brox/var/lotso: Set slew rate to 1/8

Browse source 
Set slow slew rate VCCIA and VCCGT to SLEW_FAST_8.
The slope of the voltage measured by the oscilloscope 4 mV/us is close to the theoretical value of 3.75 mV/us.

BUG=b:404416910
TEST=emerge-brox coreboot chromeos-bootimage
	USE=fw_debug confirm SlowSlewRate set to 2 at FSP

Change-Id: I7ec05c6a20997fcc094b20fa763eb3bc030fefa1
Signed-off-by: Jian Tong <tongjian@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88696
Reviewed-by: Dengwu Yu <yudengwu@huaqin.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
This commit is contained in:
Jian Tong 2025-08-06 09:11:42 +08:00 • committed by Subrata Banik
commit 543fb60ec4
1 changed files with 2 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
src/mainboard/google/brox/variants/lotso/overridetree.cb
View file

@ -74,8 +74,8 @@ chip soc/intel/alderlake
# Acoustic settings
register "acoustic_noise_mitigation" = "1"
register "slow_slew_rate[VR_DOMAIN_IA]" = "SLEW_FAST_4"
register "slow_slew_rate[VR_DOMAIN_GT]" = "SLEW_FAST_4"
register "slow_slew_rate[VR_DOMAIN_IA]" = "SLEW_FAST_8"
register "slow_slew_rate[VR_DOMAIN_GT]" = "SLEW_FAST_8"
register "fast_pkg_c_ramp_disable[VR_DOMAIN_IA]" = "1"
register "fast_pkg_c_ramp_disable[VR_DOMAIN_GT]" = "1"