c052ba0ac1
For a very long time, SeaBIOS sometimes failed to build when using multiple threads. This known problem has been haunting everyone for a very long time. Until now. Unlike most other payloads, building SeaBIOS results in two files: the SeaBIOS payload itself and SeaVGABIOS. Each file has its own target, and there's a third target called "seabios", which has the same recipe as the SeaBIOS file, which calls `payloads/external/SeaBIOS/Makefile` with a bunch of arguments. In addition, SeaVGABIOS depends on "seabios". When executing serially, if the file of either SeaBIOS or SeaVGABIOS is needed, the SeaBIOS Makefile will be run. This will generate both files, so it is not necessary to run the Makefile more than once. However, when using multiple threads, it can happen that one thread wants to make the SeaBIOS file, while another one wants to make the SeaVGABIOS file, which depends on "seabios". This implies that both threads will execute the SeaBIOS Makefile at about the same time, only to collide when performing git operations. Since git uses a lock file when updating the index, one of the threads will fail to acquire the lock with an error, which will ultimately cause the build to fail. Whenever this happened, manually aborting with Ctrl-C made the build process fail again because of the same error. The only way to get past this problem, other than using one thread, was to let the unfinished jobs complete. The thread that acquired the lock on the SeaBIOS git repository would finish building SeaBIOS, so that target would not need to be remade. When restarting the build, only the target that failed is rebuilt, so it does not collide with any other thread. To address this issue, make the SeaVGABIOS file target depend directly on the SeaBIOS file instead, and remove the duplicate "seabios" target. Change-Id: I251190d3bb27052ff474f3cd1a45022dab6fac31 Signed-off-by: Angel Pons <th3fanbus@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/39188 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-by: Nico Huber <nico.h@gmx.de>
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:
- doxygen (for generating/viewing documentation)
- 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.