Libre Computer Cottonwood (librecomputer-cottonwood)

U-Boot
Primary Bootloader It is possible to replace stock bootloader with U-Boot.	Works
Secondary Bootloader It is possible to chainload U-Boot from stock bootloader.	Untested
Mainline Latest versions of U-Boot are not broken and it is possible to use them.	Works
Internal Storage It is possible to boot from internal storage (e.g. eMMC or UFS).	Works
SD card It is possible to boot from SD card.	Works
USB Host It is possible to boot from a USB storage or connect a keyboard.	Works
USB Peripheral It is possible to use device as a peripheral in U-Boot, e.g. for fastboot mode.	Works
Display	Works
Keyboard	Works

Features
Flashing It is possible to flash the device with pmbootstrap flasher.	Broken
Multimedia
3D Acceleration	Works
Audio Audio playback, microphone, headset and buttons.	Untested
IR RX	Works
Connectivity
Ethernet	Broken
Miscellaneous
FDE Full disk encryption and unlocking with unl0kr.	Untested
USB-A Full-sized USB-A port works (Usually applicable to SBCs and laptops).	Works
HDMI/DP Video and audio output with HDMI or Display Port works.	Works

Libre Computer AML-S905D3-CC-V0.2
	; AML-S905D3-CC-V0.2 as seen on the Libre Computer website
Manufacturer	Libre Computer
Name	AML-S905D3-CC-V0.2
Codename	librecomputer-solitude
Released	2023
Type	single board computer
Hardware
Chipset	Amlogic S905D3
CPU	2.0 GHz Quad core
GPU	Mali G31
Memory	4 GB
Architecture	aarch64
Software
FOSS bootloader	yes
postmarketOS
Category	testing
Mainline Instead of a Linux kernel fork, it is possible to run (Close to) Mainline.	yes
Generic port	postmarketOS Trailblazer (postmarketos-trailblazer)
Device package	device-postmarketos-trailblazer
Kernel package	linux-postmarketos-amlogic

Libre Computer AML-A311D-CC-V0.2
Hardware
AML-A311D-CC-V0.2 as seen on the Libre Computer website
Manufacturer	Libre Computer
Name	AML-A311D-CC-V0.2
Codename	librecomputer-alta
Released	2023
Type	single board computer
Chipset	Amlogic A311D
CPU	2.0 GHz Quad core
GPU	Mali G31
Memory	4 GB
Architecture	aarch64
Software
FOSS bootloader	yes
postmarketOS
Category	testing
Mainline Instead of a Linux kernel fork, it is possible to run (Close to) Mainline.	yes
Generic port	postmarketOS Trailblazer (postmarketos-trailblazer)
Device package	device-postmarketos-trailblazer
Kernel package	linux-postmarketos-amlogic

Features
Multimedia
Flashing It is possible to flash the device with `pmbootstrap flasher`.	Broken
3D Acceleration	Works
Audio Audio playback, microphone, headset and buttons.	Untested
IR RX	Works
Connectivity
Ethernet	Broken
Miscellaneous
FDE Full disk encryption and unlocking with unl0kr.	Untested
USB-A Full-sized USB-A port works (Usually applicable to SBCs and laptops).	Works
HDMI/DP Video and audio output with HDMI or Display Port works.	Works

U-Boot
Primary Bootloader It is possible to replace stock bootloader with U-Boot.	Works
Secondary Bootloader It is possible to chainload U-Boot from stock bootloader.	Untested
Mainline Latest versions of U-Boot are not broken and it is possible to use them.	Works
Internal Storage It is possible to boot from internal storage (e.g. eMMC or UFS).	Works
SD card It is possible to boot from SD card.	Works
USB Host It is possible to boot from a USB storage or connect a keyboard.	Works
USB Peripheral It is possible to use device as a peripheral in U-Boot, e.g. for fastboot mode.	Works
Display	Works
Keyboard	Works

This device is based on the Amlogic S905D3. See the SoC page for common tips, guides and troubleshooting steps

This device is based on the Amlogic A311D. See the SoC page for common tips, guides and troubleshooting steps

The AML-S905D3-CC and AML-A311D-CC are single board computers made by Libre Computer and belonging in the Cottonwood family. Except for the SoC used they are identical. Quite well supported in mainline because of the manufacturer funding mainline development for this board.

Installation

Installation to an external USB storage device and eMMC have been tested and confirmed working.

Use pmbootstrap to build your own image, like so:

$ pmbootstrap init # manufacturer: postmarketos, codename: trailblazer, kernel: linux-postmarketos-amlogic

If installing to eMMC

If you're installing to USB or an SD card, you can skip this entirely until pmbootstrap install

Make sure the SPI/MMC switch is set to SPI and connect the board to your computer using a USB-C cable. Interrupt U-Boot and type the following in the prompt:

=> ums 0 mmc 0

Your eMMC device should appear as a normal storage device on your computer. Follow the "Writing to storage" section. Once that is done, you can:

CTRL+C - Operation aborted
=> boot

Writing to storage

$ pmbootstrap install --sdcard=/dev/storage_device # replace `mmcblk0` with the path of your USB storage device or eMMC/SD

Issues

HDMI audio

HDMI audio seems to not work with my monitor at least. Could be because there's no UCM profile or asound.state provided at the moment.

Ethernet

Ethernet works.

On older kernels and SPI flash firmware, it may not work on librecomputer-solitude however. The following is printed to dmesg:

[   87.674546] stmmaceth ff3f0000.ethernet eth0: Register MEM_TYPE_PAGE_POOL RxQ-0
[   87.899591] stmmaceth ff3f0000.ethernet eth0: PHY [mdio_mux-0.0:00] driver [RTL8211F Gigabit Ethernet] (irq=26)
[   88.107415] stmmaceth ff3f0000.ethernet: Failed to reset the dma
[   88.107432] stmmaceth ff3f0000.ethernet eth0: stmmac_hw_setup: DMA engine initialization failed
[   88.107440] stmmaceth ff3f0000.ethernet eth0: __stmmac_open: Hw setup failed

If that happens to you, upgrade your SPI flash U-Boot. Instructions for how to do that can be found here: https://hub.libre.computer/t/libre-computer-board-bios-firmware-update-images/3113

Users owning this device

FerassElHafidi (Notes: Donated to me by Libre Computer.)