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4cea3a19f8
This is enabled by CONFIG_RAMPAYLOAD. The code will look for a ram payload and, if it is found, try to run it. If the load fails or the payload returns it will continue with ramstage. We also include a new payload, linuxcheck, which is intended to verify that linux can be loaded and run, e.g. as a LinuxBoot payload. Currently, it fails. This does not yet work but it makes sense as a foundation on which to build. For one thing, we need to build at least a few tables for Linux. The goal for LinuxBoot is to build as few as possible. To test with linuxcheck (linux is not even close to working): cd payloads/linuxcheck/ cp x86config .config make cd ../.. make ./build/cbfstool build/coreboot.rom add-payload -n fallback/rampayload -f payloads/linuxcheck/linuxcheck.elf qemu-system-x86_64 -nographic -m 8192 -bios build/coreboot.rom -monitor /dev/pts/$1 -s We need to change the payload menu so we can add a rampayload but it's a bit tricky as written, so that must come later. Note that I'm still creating a special purpose romselfboot. The idea of merging romselfboot and selfboot is probably a good idea -- in the future. I think until we know how this should look, such a merge is premature. Signed-off-by: Ronald G. Minnich <rminnich@gmail.com> Change-Id: I8199aae6776f6dee969b370b0e6a41ef96e854d8 clang-formatted-by: Ronald G. Minnich Reviewed-on: https://review.coreboot.org/28402 Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com> Tested-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com> |
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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 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: * https://www.coreboot.org/Supported_Motherboards * https://www.coreboot.org/Supported_Chipsets_and_Devices 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.