commit | 7368da32e73db28ccb92945f8bbef2bfe11b2a6c | [log] [tgz] |
---|---|---|
author | Venkata Krishna Nimmagadda <venkata.krishna.nimmagadda@intel.com> | Tue Jun 09 00:11:34 2020 -0700 |
committer | Tim Wawrzynczak <twawrzynczak@chromium.org> | Fri Jun 12 18:40:23 2020 +0000 |
tree | 25e8f43624f2202b2a91bda9373fe69a2a029c4b | |
parent | e18f71964da7f2eb688c58f8de9d56097ced1cbb [diff] |
mb/google/volteer: Customize PCH VR settings for better Sx power savings For Volteer mainboard, this patch set optimized values for PCH external VR settings and ext rail voltage/current, to achieve better power savings in sleep states. v1p05 and vnn power rails can be used as an alternative source by-passing vccin_aux during Sx. This by-pass feature, enables us to shutdown vccin_aux rail which is higher voltage rail compared to v1p05 and vnn. These both rails were disabled by default in FSP. Changes in this patch are: 1. v1p05 and vnn rails are enabled and enabled supported voltage types in S0i1, S0i2, S0i3, S3, S4, S5 states. They were disabled by default. 2. Icc Max for v1p05 changed to 500 mA from default 100 mA. 3. vnn rail's voltage is changed to 5 V from default 4.2 V. BUG=None BRANCH=None TEST="Build and boot volteer and check VR settings with Intel ITP-XDP debugger and verify approx 250 mW power savings in Sx" Signed-off-by: Venkata Krishna Nimmagadda <venkata.krishna.nimmagadda@intel.com> Change-Id: Ib46423872c956af9aaa92902fce552d5447237c4 Reviewed-on: https://review.coreboot.org/c/coreboot/+/42223 Reviewed-by: Venkata Krishna Nimmagadda <Venkata.krishna.nimmagadda@intel.com> Reviewed-by: Furquan Shaikh <furquan@google.com> Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-by: Sukumar Ghorai <sukumar.ghorai@intel.com> Reviewed-by: Wonkyu Kim <wonkyu.kim@intel.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
coreboot is a Free Software project aimed at replacing the proprietary BIOS (firmware) found in most computers. coreboot performs a little bit of hardware initialization and then executes additional boot logic, called a payload.
With the separation of hardware initialization and later boot logic, coreboot can scale from specialized applications that run directly firmware, run operating systems in flash, load custom bootloaders, or implement firmware standards, like PC BIOS services or UEFI. This allows for systems to only include the features necessary in the target application, reducing the amount of code and flash space required.
coreboot was formerly known as LinuxBIOS.
After the basic initialization of the hardware has been performed, any desired "payload" can be started by coreboot.
See https://www.coreboot.org/Payloads for a list of supported payloads.
coreboot supports a wide range of chipsets, devices, and mainboards.
For details please consult:
ANY_TOOLCHAIN
Kconfig option if you're feeling lucky (no support in this case).Optional:
make menuconfig
and make nconfig
)Please consult https://www.coreboot.org/Build_HOWTO for details.
If you want to test coreboot without any risks before you really decide to use it on your hardware, you can use the QEMU system emulator to run coreboot virtually in QEMU.
Please see https://www.coreboot.org/QEMU for details.
Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website:
You can contact us directly on the coreboot mailing list:
https://www.coreboot.org/Mailinglist
The copyright on coreboot is owned by quite a large number of individual developers and companies. Please check the individual source files for details.
coreboot is licensed under the terms of the GNU General Public License (GPL). Some files are licensed under the "GPL (version 2, or any later version)", and some files are licensed under the "GPL, version 2". For some parts, which were derived from other projects, other (GPL-compatible) licenses may apply. Please check the individual source files for details.
This makes the resulting coreboot images licensed under the GPL, version 2.