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review.coreboot.org / coreboot / 6f74d38dc8d2efab31259b2f280af9484b6d3585
commit6f74d38dc8d2efab31259b2f280af9484b6d3585[log] [tgz]
authorWerner Zeh <werner.zeh@siemens.com>Mon Feb 21 07:52:13 2022 +0100
committerFelix Held <felix-coreboot@felixheld.de>Tue Feb 22 15:25:00 2022 +0000
treed77054969346db47c244af75a2c379fefc52f3ae
parent88ccd4863c9c893edd0aa6d119c357b3301c5285 [diff]
mb/siemens/mc_apl2: Enable PCI device for I2C bus 0

On mc_apl2 the external RTC is connected to I2C bus 3. All other I2C bus
devices (16.0, 16.1 and 16.2) have been disabled as they are not used.
While coreboot can handle the case where a PCI device does not have
function 0 enabled but a later one (here function 3), Linux seems to
check for function 0 first and ignores the rest if function 0
is missing. So enable PCI device 16.0 in order to let Linux use 16.3
again.

Test=Boot into Linux and make sure that PCI device 16.0 and 16.3 are
visible and I2C attached RTC works properly.

Change-Id: I55a748b6de8128f4b26b908118feff9f06d3fb7c
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62215
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
1 file changed
tree: d77054969346db47c244af75a2c379fefc52f3ae
  1. 3rdparty/
  2. configs/
  3. Documentation/
  4. LICENSES/
  5. payloads/
  6. spd/
  7. src/
  8. tests/
  9. util/
  10. .checkpatch.conf
  11. .clang-format
  12. .editorconfig
  13. .gitignore
  14. .gitmodules
  15. .gitreview
  16. AUTHORS
  17. COPYING
  18. gnat.adc
  19. MAINTAINERS
  20. Makefile
  21. Makefile.inc
  22. README.md
  23. toolchain.inc
README.md

coreboot README

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.

Payloads

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.

Supported Hardware

coreboot supports a wide range of chipsets, devices, and mainboards.

For details please consult:

Build Requirements

  • make
  • gcc / g++ Because Linux distribution compilers tend to use lots of patches. coreboot does lots of "unusual" things in its build system, some of which break due to those patches, sometimes by gcc aborting, sometimes - and that's worse - by generating broken object code. Two options: use our toolchain (eg. make crosstools-i386) or enable the ANY_TOOLCHAIN Kconfig option if you're feeling lucky (no support in this case).
  • iasl (for targets with ACPI support)
  • pkg-config
  • libssl-dev (openssl)

Optional:

  • doxygen (for generating/viewing documentation)
  • gdb (for better debugging facilities on some targets)
  • ncurses (for make menuconfig and make nconfig)
  • flex and bison (for regenerating parsers)

Building coreboot

Please consult https://www.coreboot.org/Build_HOWTO for details.

Testing coreboot Without Modifying Your Hardware

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.

Website and Mailing List

Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website:

https://www.coreboot.org

You can contact us directly on the coreboot mailing list:

https://www.coreboot.org/Mailinglist

Copyright and License

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.