commit | 66e44e325278f8a4b4227eb7d1c5d6c56e1686cd | [log] [tgz] |
---|---|---|
author | Kapil Porwal <kapilporwal@google.com> | Wed Nov 16 10:19:17 2022 +0530 |
committer | Eric Lai <eric_lai@quanta.corp-partner.google.com> | Thu Nov 24 05:45:06 2022 +0000 |
tree | 2d94b47d189c125c2e52de779bb8c0a694538e6a | |
parent | 77c4d6165dcb0be7164b22ae57861a0d0ce7df4c [diff] |
soc/intel/meteorlake: Skip setting D0I3 bit for HECI devices This patch skips setting D0I3 bit for all HECI devices by FSP. The learning being made from Alder Lake platform showed that the CSE EOP cmd response time is highly nondeterministic and letting the EOP cmd issued by FSP makes the response time even worse. The idea being pursued during Alder Lake platform is to let FSP skip sending the EOP cmd and coreboot sends it at the last minute (late sending of EOP) to ensure there is ample time for CSE to come to a state where the response to the EOP is almost immediate. There were a number of refactoring being done to ensure the EOP cmd can be sent at the later stage. #1: Ensure FSP is not putting those HECI devices into the D0i3. (SoC specific change) #2: Modify the CSE related boot state based operation to allow a proper window for sending late EOP cmd. (Common Code Specific change) The entire refactoring helps us to save ~60ms of boot time. Without those code change EOP sending timestamp as below: 943:after sending EOP to ME 1,248,328(61,954)) With those code change EOP sending timestamp as below: 943:after sending EOP to ME 1,231,660 (2,754) Port of commit d6da4ef69e4e ("soc/intel/alderlake: Skip setting D0I3 bit for HECI devices") to incorporate the #1 which is a SoC specific code change. BUG=none TEST=FSP-S UPD dump suggested `DisableD0I3SettingForHeci` UPD is set to `1`. Excerpt from google/rex coreboot log: [SPEW ] DisableD0I3SettingForHeci : 0x1 Signed-off-by: Kapil Porwal <kapilporwal@google.com> Change-Id: I1c3765ce41f192ab5f5ff176e0a2b49b312d18d2 Reviewed-on: https://review.coreboot.org/c/coreboot/+/69680 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Subrata Banik <subratabanik@google.com> Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
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.