8d268e9bda
When modules are added to the FSP and they won't fit into the FSP binary any more, the size can be increased in the FSP build. Especially in the case of debug builds the increased size might not fit into the memory region it gets decompressed into which starts at FSP_M_ADDR and has a size of FSP_M_SIZE. SoCs can implement the soc_validate_fspm_header function that ends up being called by the FSP driver in romstage to do some additional checks on the FSP binary's header that includes the version number and the image size. We can use the image size field to check if it fits into the reserved region. Since the FSP-M memory region is located after romstage loading it won't clobber the romstage code where we do the check. This runtime check is added in addition to the build-time check to also cover the case when the FSP binaries in CBFS get replaced with ones that don't fit into the reserved memory region after the coreboot build. BUG=b:186149011 TEST=Mandolin still boots fine with the patch applied. When as a test the FSP_M_SIZE Kconfig option in soc/amd/picasso is decreased to 0x10000 which is by far not enough for the decompressed FSP-M binary to fit into it prints the newly added error message on the console and then stops. Signed-off-by: Felix Held <felix-coreboot@felixheld.de> Change-Id: I9b74a2d03993ba50b166eb6e87d4e57b93afc069 Reviewed-on: https://review.coreboot.org/c/coreboot/+/57068 Reviewed-by: Furquan Shaikh <furquan@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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.