| commit | 25d01be47d0b5c1b545cc323ba11c2546c588d8b | [log] [tgz] |
|---|---|---|
| author | Subrata Banik <subratabanik@google.com> | Thu Sep 01 16:39:36 2022 +0530 |
| committer | Subrata Banik <subratabanik@google.com> | Fri Sep 02 03:46:20 2022 +0000 |
| tree | 2a61d7eee405a38826cdd4135056d5b0a0568847 | |
| parent | dee0d45ab4c357290de4bad73fef5f1128101fd3 [diff] |
soc/intel/cmn/graphics: Use pci_dev_request_bus_master for BM enabling
Enabling Bus Master isn't required by the hardware, so we shouldn't
need to enable it at all. However, some payloads do not set this bit
before attempting DMA transfers, which results in functionality
failure. For example: in this case, unable to see the developer screen
in Depthcharge.
In the prior IA SoC platform, FSP/GFX PEIM does the BM enabling for
the IGD BAR resources but starting with the MTL platform, it fails
to do so resulting into inability to see the Pre-OS display.
BUG=b:243919230 ([Rex] Unable to see Pre-OS display although GFX
PEIM Display Init is successful during AP boot)
TEST=Able to see the developer screen with eDP/HDMI while booting
the Google/Rex.
Also, this change doesn't impact the previous platforms
(ADL, TGL, CML etc.) where the BM is default enabled.
Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I9ad9eee8379b7ea1e50224e3fabb347e5f14c25b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67273
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tarun Tuli <taruntuli@google.com>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Wonkyu Kim <wonkyu.kim@intel.com>
Reviewed-by: Jamie Ryu <jamie.m.ryu@intel.com>
Reviewed-by: Kapil Porwal <kapilporwal@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.