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6fc334d6b6
Turns out making the compilation of every single source file depend on the auto-generated build.h in CL:219170 wasn't really such a great idea for incremental builds. Who would've thought. However, it's still undesirable that individual Makefiles for sources that actually include build.h need to add that dependency manually. Therefore, this patch fixes the issue by using $(generic-deps) as an order-only prerequisites in rules. This kind of prerequisite is still made before the target if it doesn't exist, but it is not automatically updated based on the timestamp. Also removed some additional manual build.h dependencies that I must somehow overlooked in the old patch. The files that actually include build.h still get it as a normal prerequisite through the automatic dependency rule in <filename>.d that is created by GCC's -MMD option. $(generic-deps) only solves the chicken-and-egg problem of where build.h comes from in fresh/cleaned build directories that don't have any .d dependency files yet. BUG=chrome-os-partner:32622 TEST=Manually did an incremental build with a single changed file. Confirmed that actual build.h dependencies (id.bootblock.o, console.*.o) were still remade, but not all other coreboot sources. Change-Id: I5a830aae6b17dd7d4061a577fd2410b678d6f1f0 Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/221470 Reviewed-by: Aaron Durbin <adurbin@chromium.org> |
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| README | ||
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------------------------------------------------------------------------------- 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 http://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: * http://www.coreboot.org/Supported_Motherboards * http://www.coreboot.org/Supported_Chipsets_and_Devices Build Requirements ------------------ * gcc / g++ * make Optional: * doxygen (for generating/viewing documentation) * iasl (for targets with ACPI support) * gdb (for better debugging facilities on some targets) * ncurses (for 'make menuconfig') * flex and bison (for regenerating parsers) Building coreboot ----------------- Please consult http://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 http://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: http://www.coreboot.org You can contact us directly on the coreboot mailing list: http://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.