commit | 9d63a6b46dd79de611dad8aaeba9bdf071370ee2 | [log] [tgz] |
---|---|---|
author | Patrick Rudolph <patrick.rudolph@9elements.com> | Mon Sep 07 09:32:37 2020 +0200 |
committer | Patrick Georgi <pgeorgi@google.com> | Wed Sep 09 10:37:13 2020 +0000 |
tree | 273402ba96d17eb5912fa6e711428f35b6e46ec0 | |
parent | 7f29896c773da31b31d3c4da7b8bfdfaacf691ad [diff] |
drivers/aspeed/common: Support disabled P2A bridge This ports Linux commit 71f677a91046599ece96ebab21df956ce909c456 "Handle configuration without P2A bridge". Quote: The ast driver configures a window to enable access into BMC memory space in order to read some configuration registers. If this window is disabled, which it can be from the BMC side, the ast driver can't function. Closing this window is a necessity for security if a machine's host side and BMC side are controlled by different parties; i.e. a cloud provider offering machines "bare metal". P2A stands for primary to AHB. Tested on Prodrive Hermes, which uses an AST2500. The machine still boots, has a high resolution framebuffer working in EDK2, and its boot time has been reduced by 2.5 seconds as it no longer runs into a timeout due to disabled P2A bridge. Change-Id: I3293dc35ae89c010154e02eff904ec3a68c96683 Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/45137 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
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.