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Tim Wawrzynczak 6db9dccc57 soc/intel: Fix microcode loading
Commit 1aa60a95bd broke microcode loading for chipsets that have a
microcode blob with a total_size field set to 0. This appears to be
support for older chipsets, where the size was set to 0 and assumed to
be 2048 bytes. The fix is to change the result of the subtraction to a
signed type, and ensure the following comparison is done without
promoting the signed type to an unsigned one.

Resolves: https://ticket.coreboot.org/issues/313
Change-Id: I62def8014fd3f3bbf607b4d58ddc4dca4c695622
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56153
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Stefan Ott <coreboot@desire.ch>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2021-07-09 11:49:02 +00:00
3rdparty Update vboot submodule to upstream main 2021-07-01 09:38:12 +00:00
Documentation Documentation/drivers/dptf: Add oem variables support 2021-07-08 15:49:55 +00:00
LICENSES
configs configs: Explicitly specify vendor and mainboard 2021-07-07 05:48:25 +00:00
payloads nvs: Add Chrome OS NVS (CNVS) information to coreboot tables 2021-06-18 18:38:14 +00:00
src soc/intel: Fix microcode loading 2021-07-09 11:49:02 +00:00
tests helpers: Introduce retry macro 2021-06-26 10:09:06 +00:00
util amdfwtool: Fix the NULL pointer in parameters 2021-07-08 18:52:00 +00:00
.checkpatch.conf lint: checkpatch: Only exclude specific src/vendorcode/ subdirectories 2021-04-06 16:04:41 +00:00
.clang-format
.editorconfig
.gitignore
.gitmodules .gitmodules: Update intel-microcode submodule to track branch=main 2021-06-09 17:20:50 +00:00
.gitreview
AUTHORS
COPYING
MAINTAINERS Revert "src/mainboard: Add Star Labs labtop series" 2021-06-04 18:52:32 +00:00
Makefile tests: improve code coverage support 2021-05-19 19:56:02 +00:00
Makefile.inc Revert "Makefile.inc: Drop the cbfs master header from non-X86" 2021-07-09 00:52:10 +00:00
README.md
gnat.adc
toolchain.inc toolchain.inc: copy architecture specific CFLAGS to GCC_ADAFLAGS 2021-07-01 09:43:54 +00:00

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_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

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.