4924cdb9ac
The coreboot build system automatically adds a `config` file to CBFS that lists the exact Kconfig configuration that this image was built with. This is useful to reproduce a build after the fact or to check whether support for a specific feature is enabled in the image. However, the file is currently generated using the `savedefconfig` command to Kconfig, which generates the minimal .config file that is needed to produce the required config in a coreboot build. This is fine for reproduction, but bad when you want to check if a certain config was enabled, since many configs get enabled by default or pulled in through another config's `select` statement and thus don't show up in the defconfig. This patch tries to fix that second use case by instead including the full .config instead. In order to save some space, we can remove all comments (e.g. `# CONFIG_XXX is not set`) from the file, which still makes it easy to test for a specific config (if it's in the file you can extract the right value, if not you can assume it was set to `n`). We can also LZMA compress it since this file is never read by firmware itself and only intended for later re-extraction via cbfstool, which always has LZMA support included. On a sample Trogdor device the existing (uncompressed) `config` file takes up 519 bytes in CBFS, whereas the new (compressed) file after this patch will take up 1832 bytes -- still a small amount that should hopefully not break the bank for anyone. Signed-off-by: Julius Werner <jwerner@chromium.org> Change-Id: I5259ec6f932cdc5780b8843f46dd476da9d19728 Reviewed-on: https://review.coreboot.org/c/coreboot/+/69710 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Yu-Ping Wu <yupingso@google.com> Reviewed-by: Jakub Czapiga <jacz@semihalf.com> Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com> |
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| 3rdparty | ||
| Documentation | ||
| LICENSES | ||
| configs | ||
| payloads | ||
| spd | ||
| src | ||
| tests | ||
| util | ||
| .checkpatch.conf | ||
| .clang-format | ||
| .editorconfig | ||
| .gitignore | ||
| .gitmodules | ||
| .gitreview | ||
| .mailmap | ||
| AUTHORS | ||
| COPYING | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc | ||
| README.md | ||
| gnat.adc | ||
| 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_TOOLCHAINKconfig 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 menuconfigandmake 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:
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.