lbwww/site/contrib.md

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title: Project contributors
x-toc-enable: true
...

This list does not necessarily reflect who is currently working on the project,
but it lists some people who have contributed to the project in meaningful ways.

If we forgot to mention you here, let us know and we'll add you. (or if
you don't want to be mentioned, let us know and we'll remove your
entry)

Information about who works on libreboot, and how the project is run, can
be found on this page: [who.md](who.md)

You can know the history of the libreboot project, simply by reading this page.
It goes into detail about all of the major contributions to the project, and in
general how the project was created (and who helped create it).

Leah Rowe
---------

**Founder of the Libreboot project, and currently the lead developer.** Leah
works on all aspects of libreboot, such as:

* General management. Leah handles all outside contributions to libreboot,
  reviews pull requests, deals with bug reports, delegates tasks when necessary
  or desirable. Leah controls the libreboot.org server infrastructure, hosted
  in her lab.
* Leah has the final say on all decisions, taking input via discussion with
  members of the public, mostly on IRC. Leah oversees releases of libreboot,
  and generally keeps the project going. Without Leah, there would be no Libreboot!
* The build system (lbmk, short for libreboot Make). This is the automated build
  system that sits at the heart of libreboot; it downloads, patches, configures
  and compiles the relevant components like coreboot, GRUB and generates
  the libreboot ROM images that you can find in release archives.
* Upstream work on coreboot, when necessary (and other projects that libreboot
  uses). This means also working with people from outside of the libreboot
  project, to get patches merged (among other things) on the upstream projects
  that libreboot uses
* Providing user support on IRC

Caleb La Grange
---------------

**Secondary developer, number two to Leah.** Caleb is a full time libreboot developer
with a narrower focus. Caleb focuses on several areas of development:

* Build system. Caleb is responsible for improving and fixing the libreboot Make build
system. Specifically: automation, and reproducibility. 
* Hardware modification. Caleb has a passion for hardware alteration; soldering,
desoldering, and testing libreboot software on the resulting hardware.
* Board porting. Anything supported in Coreboot can be ported to libreboot, Caleb
will test and port any board he can get his hands on. Additionally, anyone can
contact Caleb to generate libreboot roms for testing on their board.
* Documentation. Caleb actively maintains documentation on the above areas of
interest. Additionally, Caleb is responsible for disassembly guides with his own
pictures and diagrams for several boards.
* User support. Caleb is active on irc and willing to help any user interested in
using libreboot or in need of help.
* Project goals. Caleb collaborates with Leah on determining project goals.
Leah has the final say in every decision.

External projects
=================

Coreboot project
----------------

Without coreboot, the libreboot project simply would not be possible.

The people and companies that work on coreboot are numerous, and they make the
libreboot project what it is. The libreboot project makes heavy use of coreboot, to
provide hardware initialization.

GRUB
--------

GRUB is the bootloader used by libreboot. It goes without saying that the GRUB
developers enable libreboot, through their work.

SeaBIOS
-------

The libreboot firmware provides SeaBIOS as a payload option. SeaBIOS provides a
legacy x86 BIOS implementation.

U-Boot
------

Libreboot uses U-Boot as the coreboot payload on supported ARM Chromebooks.

Contributors in alphabetical order
==================================

Alper Nebi Yasak
----------------

Contributed the build system integration and documentation for using
U-Boot as payload, and initial Libreboot ports of some ARM Chromebooks
based on that.

Alper also does upstream development on U-Boot, e.g. continued an almost
complete port of the `gru-kevin` board and got it merged upstream.

Alyssa Rosenzweig
-----------------

Switched the website to use markdown in lieu of handwritten HTML and custom
PHP. **Former libreboot project maintainer (sysadmin for libreboot.org).**

Alyssa wrote the original static site generator (shell scripts converting
markdown to html, via pandoc) for libreboot.org. This static site generator has
now been heavily modified and forked into a formal project, by Leah Rowe:

<https://untitled.vimuser.org/> (untitled is Leah's work, not Alyssa's, but it's based on
Alyssa's original work on the static site generator that Libreboot used to use;
the Libreboot website is now built with Untitled)

Andrew Robbins
--------------

Worked on large parts of Libreboot's old build system and related documentation.
Andrew joined the Libreboot project as a full time developer during June 2017,
until his departure in March 2021.

I, Leah Rowe, am very grateful to Andrew Robbins for his numerous contributions
over the years.

Arthur Heymans
--------------

Merged a patch from coreboot into libreboot, enabling C3 and C4 power
states to work correctly on GM45 laptops. This was a long-standing issue
before Arthur's contribution. Arthur also fixed VRAM size on i945 on
GM45 systems, allowing maximum VRAM allocation for the onboard GPUs on
these systems, another longstanding issue in libreboot.

Arthur also did work on the Libreboot build system, when he was a member of the
project. He still works on coreboot, to this day, and Libreboot greatly
benefits from his work. His contributions to the coreboot project, and Libreboot,
are invaluable.

Damien Zammit
-------------

Maintains the Gigabyte GA-G41M-ES2L coreboot port, which is integrated
in libreboot. Also works on other hardware for the benefit of the
libreboot project.

Damien didn't work directly on Libreboot itself, but he worked heavily with
Leah Rowe, integrating patches and new board ports into Libreboot, based on
Damien's upstream work on coreboot.

Denis Carikli
-------------

Based on the work done by Peter Stuge, Vladimir Serbinenko and others in
the coreboot project, got native graphics initialization to work on the
ThinkPad X60, allowing it to be supported in libreboot. Denis gave
a lot of advice and helped found the libreboot project.

Denis was a mentor to Leah Rowe in the early days, when she founded the
Libreboot project. A lot of the decisions taken, especially with the
Libreboot build system (lbmk), were inspired from talks with Denis.

Denis taught Leah about registers used by Intel GPUs for backlight control. In
the early days, the ThinkPad X60 and T60 laptops in Libreboot did not have
backlight control working, so the brightness was always 100%. With Denis's help,
Leah was able to get backlight controls working by reverse engineering the
correct values to write in those registers. Based on this, a simple fix was
written in coreboot; however, the fix just wrote directly to the register and
didn't work with ACPI based brightness controls. Others in coreboot later
improved it, making ACPI-based backlight controls work properly, based on this
earlier work.

Ferass El Hafidi
--------

Added cstate 3 support on macbook21, enabling higher battery life and cooler
CPU temperatures on idle usage.

Also has a series of extensive improvements to the entire Libreboot system;
for example, Ferass made the entire build system use POSIX `sh`, removing
bashisms that previously plagued it.

This is IRC nick `f_` on Libreboot IRC. Cool guy!

Jeroen Quint
------------

Contributed several fixes to the libreboot documentation, relating to
installing on Arch-based systems with full disk encryption on libreboot
systems.

Joshua Gay
----------

Joshua was in a position during 2014-2016 to help promote Libreboot in the
media, in his capacity working for the employer he worked for at the time;
I credit him specifically. Joshua was one of Libreboot's earliest supporters.

He made sure everyone knew what I was doing, and he taught me a *lot* about
licensing; many of Libreboot's practises today are still based on his lessons,
such as the pitfalls of GPL compliance and how to really audit everything.

Klemens Nanni
-------------

Made many fixes and improvements to the GRUB configuration used in
libreboot, and several tweaks to the build system.

Lisa Marie Maginnis
-------------------

Lisa was one of Libreboot's early contributors to Libreboot. She personally
helped me set up a lot of the early infrastructure, including things like IRC,
mailing list and so on. She provided a lot of technical guidance, while working
in a sysadmin job for a certain free software organisation; she was both a
mentor and a friend.

She got me in touch with a lot of people, and at one point was instrumental in
helping Paul Kocialkowski secure funding to work on the Veyron Speedy boards
in Libreboot, e.g. ASUS Chromebook C201PA - at the time, this was using
Google's own Depthcharge payload, which you can find in 2016 Libreboot
releases.

Lorenzo Aloe
------------

Provided hardware testing for the [Dell OptiPlex 9020](docs/hardware/dell9020.md),
also provided testing for proxmox with GPU passthrough on Dell Precision T1650,
confirming near-native performance; with this, you can boot operating systems
virtually natively, performance-wise, on a Libreboot system in cases where
that OS is not natively supported.

All round good guy, an honest and loyal fan.

Marcus Moeller
--------------

Made the libreboot logo.

Nicholas Chin
-------------

[Ported Dell Latitude E6400 to Libreboot](news/e6400.md)
and also [Dell Latitude E6430](hardware/e6430.md) - author of
the `dell-flash-unlock` (formerly `e6400-flash-unlock`) utility, which
can unlock the flash on these boards, allowing internal flashing of
Libreboot directly from host OS running under the original Dell firmware.

Patrick "P. J." McDermott
---------------------------

Patrick also did a lot of research and wrote the libreboot FAQ section
relating to the [Intel Management Engine](../faq.md#intelme), in addition
to making several improvements to the build system in libreboot. **Former
libreboot project maintainer.**

Paul Kocialkowski
-----------------

Ported the ARM (Rockchip RK3288 SoC) based *Chromebook* laptops to
libreboot. Also one of the main [Replicant](http://www.replicant.us/)
developers.

Paul Menzel
-----------

Investigated and fixed a bug in coreboot on the ThinkPad X60/T60 exposed
by Linux kernel 3.12 and up, which caused 3D acceleration to stop
working and video generally to become unstable. The issue was that coreboot,
when initializing the Intel video chipset, was mapping *GTT Stolen Memory* in
the wrong place, because the code was based on kernel code and the Linux kernel
had the same bug. When Linux fixed it, it exposed the same bug in coreboot.

Paul worked with Libreboot on
this, sending patches to test periodically until the bug was fixed
in coreboot, and then helped her integrate the fix in libreboot.

Peter Stuge
-----------

Helped write the [FAQ section about DMA](../faq.md#hddssd-firmware), and provided
general advice in the early days of the project. Peter was a coreboot developer
in those days, and a major developer in the *libusb* project (which flashrom
makes heavy use of).
NOTE: Libreboot standardises on [flashprog](https://flashprog.org/wiki/Flashprog)
now, as of 27 January 2024.

Peter also wrote the *bucts* utility used to set Backup Control (BUC) Top Swap
(TS) bit on i945 laptops such as ThinkPad X60/T60, which is useful for a
workaround to flash Libreboot without using external hardware; on this machine,
with Lenovo BIOS present, it's possible to flash everything except the main
bootblock, but Intel platforms have 2 bootblocks, and you specify which one is
to be used by setting the TS bit. You then boot with only one bootblock flashed
(by the coreboot project's bootblock on that machine), and afterwards you reset
bucts before flashing the ROM again, to flash the main bootblock. Libreboot
hosts a copy of his work, because his website hosting bucts is no longer
responsive.

Riku Viitanen
-------------

Added support for HP Elite 8200 SFF desktop PC to Libreboot. You can read
about this in the hardware page:

[HP Elite 8200 SFF](docs/hardware/hp8200sff.md)

Steve Shenton
-------------

Steve did the early reverse engineering work on the Intel Flash Descriptor used
by ICH9M machines such as ThinkPad X200. He created a C struct defining (using
bitfields in C) this descriptor region. With some clever tricks, he was able to
discover the existence of a bit in the descriptor for *disabling* the Intel ME
(management engine) on those platforms.

His initial proof of concept only defined the descriptor, and would do this:

* Read the default descriptor and GbE regions from a Lenovo X200 ROM (default
  firmware, not coreboot)
* Disable the ME, by setting 2 bits in the descriptor
* Disable the ME region
* Move descriptor+GbE (12KiB in total) next to each other
* Allocate the remaining flash space to the BIOS region
* Generated the 12KiB descriptor+GbE region, based on this, to insert into a
  coreboot ROM image.

In the early days, before Libreboot supported GM45+ICH9M platforms such as
ThinkPad X200/T400, you could use those machines but to avoid the Intel ME you
had to flash it without a descriptor region. This worked fine in those days,
because the ME only handled TPM and AMT on those machines, and the system would
work normally, but that Intel Flash Descriptor also handles the Intel GbE NVM
region in flash, which is used for the Intel Gigabit Ethernet interface.

So you either had Intel ME, or no ethernet support. Steve figured out how to
disable the Intel ME via 2 toggle bits in the descriptor, and also how to
remove the Intel ME region from flash.

Based on his research, I, Leah Rowe, working alongside Steve, also reverse
engineered the layout of the Intel GbE NVM (non-volatile memory) region in the
boot flash. This region defines configuration options for the onboard Intel
GbE NIC, if present.

Based on this, I was able to take Steve's initial proof of concept and write
the `ich9gen` utility, which generates an Intel Flash Descriptor and GbE NVM
region, from scratch, without an Intel ME region defined. It is this tool,
the `ich9gen` tool, that Libreboot uses to provide ROM images for GM45+ICH9M
platforms (such as ThinkPad X200/T400/T500/W500), with a fully functional
descriptor and functional Gigabit Ethernet, but *without* needing Intel
Management Engine (ME) firmware, thus making those machines *libre* (the ME
is fully disabled, when you use a descriptor+gbe image generated by `ich9gen`).

With *my* `ich9gen` tool (Steve's tool was called `ich9deblob`), you didn't
need a dump of the original Lenovo BIOS firmware anymore! I could not have
written this tool, without Steve's initial proof of concept. I worked with him,
extensively, for many months. All GM45+ICH9M support (X200, T400, etc) in
Libreboot is made possible because of the work he did, back in 2014.

Swift Geek
----------

Contributed a patch for ich9gen to generate 16MiB descriptors.

After that, Swift Geek slowly became more involved until he became a full time
developer. Swift Geeks contributions were never really in the form of *code*,
but what he lacked in code, he made up for in providing excellent support, both
to users and other developers, helping others learn more about technology at a
low level.

When Swift Geek was a member of the project, his role was largely providing
user support (in the IRC channel), and conducting research. Swift Geek knows a
lot about hardware. Swift Geek also did some upstream development on GRUB.

Swift Geek has provided technical advice on numerous occasions, to Leah Rowe,
and helped her to improve her soldering skills in addition to teaching her
some repair skills, to the point where she can now repair most faults on
ThinkPad mainboards (while looking at the schematics and boardview).

Swiftgeek left the project in March 2021. I, Leah Rowe, wish him all the best
in his endeavours, and I'm very grateful to his numerous contributions over the
years.

Timothy Pearson
---------------

Ported the ASUS KGPE-D16 board to coreboot for the company Raptor
Engineering of which Timothy is the CEO.
Timothy maintains this code in coreboot,
helping the project with the libreboot integration for it. This person's
contact details are on the raptor site.

**D16 support was removed on 19 November 2022. You can still use older
revisions of Libreboot, and older release versions.**

Vladimir Serbinenko
-------------------

Ported many of the thinkpads supported in libreboot, to coreboot, and
made many fixes in coreboot which benefited the libreboot project.

Vladimir wrote a lot of the original video initialization code used by various
Intel platforms in Libreboot, when flashing it (now rewritten
by others in Ada, for libgfxinit in coreboot, but originally it was written in
C and included directly in coreboot; libgfxinit is a 3rdparty submodule of
coreboot).