35599f9a66
Recommonmark has been deprecated since 2021 [1] and the last release was
over 3 years ago [2]. As per their announcement, Markedly Structured
Text (MyST) Parser [3] is the recommended replacement.
For the most part, the existing documentation is compatible with MyST,
as both parsers are built around the CommonMark flavor of Markdown. The
main difference that affects coreboot is how the Sphinx toctree is
generated. Recommonmark has a feature called auto_toc_tree, which
converts single level lists of references into a toctree:
* [Part 1: Starting from scratch](part1.md)
* [Part 2: Submitting a patch to coreboot.org](part2.md)
* [Part 3: Writing unit tests](part3.md)
* [Managing local additions](managing_local_additions.md)
* [Flashing firmware](flashing_firmware/index.md)
MyST Parser does not provide a replacement for this feature, meaning the
toctree must be defined manually. This is done using MyST's syntax for
Sphinx directives:
```{toctree}
:maxdepth: 1
Part 1: Starting from scratch <part1.md>
Part 2: Submitting a patch to coreboot.org <part2.md>
Part 3: Writing unit tests <part3.md>
Managing local additions <managing_local_additions.md>
Flashing firmware <flashing_firmware/index.md>
```
Internally, auto_toc_tree essentially converts lists of references into
the Sphinx toctree structure that the MyST syntax above more directly
represents.
The toctrees were converted to the MyST syntax using the following
command and Python script:
`find ./ -iname "*.md" | xargs -n 1 python conv_toctree.py`
```
import re
import sys
in_list = False
f = open(sys.argv[1])
lines = f.readlines()
f.close()
with open(sys.argv[1], "w") as f:
for line in lines:
match = re.match(r"^[-*+] \[(.*)\]\((.*)\)$", line)
if match is not None:
if not in_list:
in_list = True
f.write("```{toctree}\n")
f.write(":maxdepth: 1\n\n")
f.write(match.group(1) + " <" + match.group(2) + ">\n")
else:
if in_list:
f.write("```\n")
f.write(line)
in_list = False
if in_list:
f.write("```\n")
```
While this does add a little more work for creating the toctree, this
does give more control over exactly what goes into the toctree. For
instance, lists of links to external resources currently end up in the
toctree, but we may want to limit it to pages within coreboot.
This change does break rendering and navigation of the documentation in
applications that can render Markdown, such as Okular, Gitiles, or the
GitHub mirror. Assuming the docs are mainly intended to be viewed after
being rendered to doc.coreboot.org, this is probably not an issue in
practice.
Another difference is that MyST natively supports Markdown tables,
whereas with Recommonmark, tables had to be written in embedded rST [4].
However, MyST also supports embedded rST, so the existing tables can be
easily converted as the syntax is nearly identical.
These were converted using
`find ./ -iname "*.md" | xargs -n 1 sed -i "s/eval_rst/{eval-rst}/"`
Makefile.sphinx and conf.py were regenerated from scratch by running
`sphinx-quickstart` using the updated version of Sphinx, which removes a
lot of old commented out boilerplate. Any relevant changes coreboot had
made on top of the previous autogenerated versions of these files were
ported over to the newly generated file.
From some initial testing the generated webpages appear and function
identically to the existing documentation built with Recommonmark.
TEST: `make -C util/docker docker-build-docs` builds the documentation
successfully and the generated output renders properly when viewed in
a web browser.
[1] https://github.com/readthedocs/recommonmark/issues/221
[2] https://pypi.org/project/recommonmark/
[3] https://myst-parser.readthedocs.io/en/latest/
[4] https://doc.coreboot.org/getting_started/writing_documentation.html
Change-Id: I0837c1722fa56d25c9441ea218e943d8f3d9b804
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73158
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
4.6 KiB
Purism Librem 14
This page describes how to run coreboot on the Purism Librem 14.
+------------------+------------------------------------------------------+
| CPU | Intel Core i7-10710U |
+------------------+------------------------------------------------------+
| PCH | Comet Lake LP Premium (Comet Lake-U) |
+------------------+------------------------------------------------------+
| EC | ITE IT8528E |
+------------------+------------------------------------------------------+
| Coprocessor | Intel Management Engine (CSME 14.x) |
+------------------+------------------------------------------------------+
Required proprietary blobs
To build a minimal working coreboot image some blobs are required (assuming only the BIOS region is being modified).
+-----------------+---------------------------------+---------------------+
| Binary file | Apply | Required / Optional |
+=================+=================================+=====================+
| FSP-M, FSP-S | Intel Firmware Support Package | Required |
+-----------------+---------------------------------+---------------------+
| microcode | CPU microcode | Required |
+-----------------+---------------------------------+---------------------+
FSP-M and FSP-S are obtained after splitting the CometLake1 FSP binary
(done automatically by the coreboot build system and included into the
image) from the 3rdparty/fsp submodule.
Microcode updates are automatically included into the coreboot image by the
build system from the 3rdparty/intel-microcode submodule. Official Purism
release images may include newer microcode, which is instead pulled from
Purism's purism-blobs repository.
A VGA Option ROM is not required to boot, as the Librem 14 uses libgfxinit.
Intel Management Engine
The Librem 14 uses version 14.x of the Intel Management Engine (ME) / Converged Security Engine (CSE). The ME/CSE is disabled using the High Assurance Platform (HAP) bit, which puts the ME into a disabled state after platform bring-up (BUP) and disables all PCI/HECI interfaces. This can be verified checking the coreboot console log, using coreboot’s cbmem utility:
`sudo ./cbmem -1 | grep 'ME:'`
provided coreboot has been patched to output the ME status even when the PCI device is not visible/active (as it is in Purism's release builds).
Flashing coreboot
Internal programming
The main SPI flash can be accessed using flashrom. No official flashrom release supports the CometLake-U SoC yet, so it must be built from source. Version v1.2-107-gb1f858f or later is needed. Firmware an be easily flashed with internal programmer (either BIOS region or full image).
External programming
The system has an internal flash chip which is a 16 MiB soldered SOIC-8 chip, and has a diode attached to the VCC line for in-system programming. This chip is located on the bottom side of the board, in between the CPU heatsink and the left cooling fan, just above the left SO-DIMM slot.
One has to remove all 9 screws from the bottom cover, then disconnect the battery from the mainboard (bottom left of mainboard). Use a SOIC-8 chip clip to program the chip (a Gigadevice GD25Q127C (3.3V) - datasheet).
The EC firmware is stored on a separate SOIC-8 chip (a Gigadevices GD25Q80C), located underneath the Wi-Fi module, below the left cooling fan.
Known issues
- Automatic detection of external audio input/output via the 3.5mm jack does not currently work.
- PL1/PL2 limited to 15W/20W by charger and battery discharge capability, not SoC or thermal design.
Working
- Internal display with libgfxinit, VGA option ROM, or FSP/GOP init
- External displays via HDMI, USB-C Alt-Mode
- SeaBIOS (1.14), edk2 (CorebootPayloadPkg), and Heads payloads
- Ethernet, m.2 2230 Wi-Fi
- System firmware updates via flashrom
- M.2 storage (NVMe, SATA III)
- Built-in audio (speakers, microphone)
- SMBus (reading SPD from DIMMs)
- Initialization with FSP 2.0 (CometLake1)
- S3 Suspend/Resume
- Booting PureOS 10.x, Debian 11.x, Qubes 4.0.4, Windows 10 20H2
Not working / untested
- N/A