4 coreboot is a Free Software project aimed at replacing the proprietary
5 firmware (BIOS/UEFI) found in most computers. coreboot performs the
6 required hardware initialization to configure the system, then passes
7 control to a different executable, referred to in coreboot as the
8 payload. Most often, the primary function of the payload is to boot the
11 With the separation of hardware initialization and later boot logic,
12 coreboot is perfect for a wide variety of situations. It can be used
13 for specialized applications that run directly in the firmware, running
14 operating systems from flash, loading custom bootloaders, or
15 implementing firmware standards, like PC BIOS services or UEFI. This
16 flexibility allows coreboot systems to include only the features
17 necessary in the target application, reducing the amount of code and
24 All source code for coreboot is stored in git. It is downloaded with
27 `git clone https://review.coreboot.org/coreboot.git`.
29 Code reviews are done in [the project's Gerrit
30 instance](https://review.coreboot.org/).
32 The code may be browsed via [coreboot's Gitiles
33 instance](https://review.coreboot.org/plugins/gitiles/coreboot/+/refs/heads/master).
35 The coreboot project also maintains a
36 [mirror](https://github.com/coreboot/coreboot) of the project on github.
37 This is read-only, as coreboot does not accept github pull requests,
38 but allows browsing and downloading the coreboot source.
43 After the basic initialization of the hardware has been performed, any
44 desired "payload" can be started by coreboot.
46 See <https://doc.coreboot.org/payloads.html> for a list of some of
47 coreboot's supported payloads.
53 The coreboot project supports a wide range of architectures, chipsets,
54 devices, and mainboards. While not all of these are documented, you can
55 find some information in the [Architecture-specific
56 documentation](https://doc.coreboot.org/arch/index.html) or the
57 [SOC-specific documentation](https://doc.coreboot.org/soc/index.html).
59 For details about the specific mainboard devices that coreboot supports,
60 please consult the [Mainboard-specific
61 documentation](https://doc.coreboot.org/mainboard/index.html) or the
62 [Board Status](https://coreboot.org/status/board-status.html) pages.
68 Releases are currently done by coreboot every quarter. The
69 release archives contain the entire coreboot codebase from the time of
70 the release, along with any external submodules. The submodules
71 containing binaries are separated from the general release archives. All
72 of the packages required to build the coreboot toolchains are also kept
73 at coreboot.org in case the websites change, or those specific packages
74 become unavailable in the future.
76 All releases are available on the [coreboot
77 download](https://coreboot.org/downloads.html) page.
79 Please note that the coreboot releases are best considered as snapshots
80 of the codebase, and do not currently guarantee any sort of extra
83 Build Requirements and building coreboot
84 ----------------------------------------
86 The coreboot build, associated utilities and payloads require many
87 additional tools and packages to build. The actual coreboot binary is
88 typically built using a coreboot-controlled toolchain to provide
89 reproducibility across various platforms. It is also possible, though
90 not recommended, to make it directly with your system toolchain.
91 Operating systems and distributions come with an unknown variety of
92 system tools and utilities installed. Because of this, it isn't
93 reasonable to list all the required packages to do a build, but the
94 documentation lists the requirements for a few different Linux
97 To see the list of tools and libraries, along with a list of
98 instructions to get started building coreboot, go to the [Starting from
99 scratch](https://doc.coreboot.org/tutorial/part1.html) tutorial page.
101 That same page goes through how to use QEMU to boot the build and see
105 Website and Mailing List
106 ------------------------
108 Further details on the project, as well as links to documentation and
109 more can be found on the coreboot website:
111 <https://www.coreboot.org>
113 You can contact us directly on the coreboot mailing list:
115 <https://doc.coreboot.org/community/forums.html>
119 Copyrights and Licenses
120 ---------------------
123 ### Uncopyrightable files
125 There are many files in the coreboot tree that we feel are not
126 copyrightable due to a lack of creative content.
128 "In order to qualify for copyright protection in the United States, a
129 work must satisfy the originality requirement, which has two parts. The
130 work must have “at least a modicum” of creativity, and it must be the
131 independent creation of its author."
133 <https://guides.lib.umich.edu/copyrightbasics/copyrightability>
135 Similar terms apply to other locations.
137 These uncopyrightable files include:
139 - Empty files or files with only a comment explaining their existence.
140 These may be required to exist as part of the build process but are
141 not needed for the particular project.
142 - Configuration files either in binary or text form. Examples would be
143 files such as .vbt files describing graphics configuration, spd files
144 as binary .spd or text \*spd\*.hex representing memory chip
146 - Machine-generated files containing version numbers, dates, hash
147 values or other "non-creative" content.
149 As non-creative content, these files are in the public domain by
150 default. As such, the coreboot project excludes them from the project's
151 general license even though they may be included in a final binary.
153 If there are questions or concerns about this policy, please get in
154 touch with the coreboot project via the mailing list.
159 The copyright on coreboot is owned by quite a large number of individual
160 developers and companies. A list of companies and individuals with known
161 copyright claims is present at the top level of the coreboot source tree
162 in the 'AUTHORS' file. Please check the git history of each of the
163 source files for details.
168 Because of the way coreboot began, using a significant amount of source
169 code from the Linux kernel, it's licensed the same way as the Linux
170 Kernel, with GNU General Public License (GPL) Version 2. Individual
171 files are licensed under various licenses, though all are compatible
172 with GPLv2. The resulting coreboot image is licensed under the GPL,
173 version 2. All source files should have an SPDX license identifier at
174 the top for clarification.
176 Files under coreboot/Documentation/ are licensed under CC-BY 4.0 terms.
177 As an exception, files under Documentation/ with a history older than
178 2017-05-24 might be under different licenses.
180 Files in the coreboot/src/commonlib/bsd directory are all licensed with
181 the BSD-3-clause license. Many are also dual-licensed GPL-2.0-only or
182 GPL-2.0-or-later. These files are intended to be shared with libpayload
183 or other BSD licensed projects.
185 The libpayload project contained in coreboot/payloads/libpayload may be
186 licensed as BSD or GPL, depending on the code pulled in during the build
187 process. All GPL source code should be excluded unless the Kconfig
188 option to include it is set.
191 The Software Freedom Conservancy
192 --------------------------------
194 Since 2017, coreboot has been a member of [The Software Freedom
195 Conservancy](https://sfconservancy.org/), a nonprofit organization
196 devoted to ethical technology and driving initiatives to make technology
197 more inclusive. The conservancy acts as coreboot's fiscal sponsor and