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review.coreboot.org / coreboot / 4924e422750474482087b202724f9cfa32de047d
commit4924e422750474482087b202724f9cfa32de047d[log] [tgz]
authorJulius Werner <jwerner@chromium.org>Wed Nov 23 18:20:32 2022 -0800
committerYu-Ping Wu <yupingso@google.com>Wed Dec 07 02:38:40 2022 +0000
tree4acc0a4a06727fb136e5faa24f2285a6ab4db6bc
parentd5c5b5233d0ee35b02eefc5f1db33ff92f878161 [diff]
build: Combine "savedefconfig" and "stripped config" in CBFS `config`

The intention of CB:69710 was that the expanded config file introduced
there would be a strict superset of the old version and could be used in
all the same cases. This is generally true except for a small oversight:
if a boolean Kconfig is `default y`, but was manually set to `n` by the
user, the new `config` file does not include a line for it. Running
`make olddefconfig` on such a file will again introduce the option as
`y`. It turns out that `make olddefconfig` actually parses those
"load-bearing comments" in that case.

This patch fixes the problem by also generating the minimal defconfig
(like before CB:69710), and then just appending the non-comment lines
from the full config that don't appear in it already. This ensures that
any "load-bearing comments" in the defconfig remain in the file and the
result of Kconfig utilities regenerating a full config from there will
again be the same as before CB:69710. In addition, it clearly separates
the "minimal defconfig" part of the file from the rest, making it easy
for people to extract that if they need it; while also keeping all the
config values in one file to make it easy to grep for a certain value.

Also eliminate that random backslash in the recipe that doesn't seem to
have any good reason to exist and was probably a typo to begin with.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I52ba5d20d3536498fae79d529acf7135f97ef1a8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69955
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
1 file changed
tree: 4acc0a4a06727fb136e5faa24f2285a6ab4db6bc
  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. .mailmap
  17. AUTHORS
  18. COPYING
  19. gnat.adc
  20. MAINTAINERS
  21. Makefile
  22. Makefile.inc
  23. README.md
  24. 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:

  • 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.