Qualcomm RBx (qcom-rbx)
Manufacturer | Qualcomm |
---|---|
Name | RBx |
Codename | qcom-rbx |
Model | Various |
Type | generic |
Hardware | |
Chipset | Various |
CPU | Qualcomm |
GPU | Various |
Architecture | aarch64 |
Software | |
Original software The software and version the device was shipped with. |
Various Various |
Extended version The most recent supported version from the manufacturer. |
Various |
postmarketOS | |
Category | testing |
Pre-built images Whether pre-built images are available here. |
no |
Mainline Instead of a Linux kernel fork, it is possible to run (Close to) Mainline. |
yes |
Device package |
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Kernel package |
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Flashing It is possible to flash the device with pmbootstrap flasher . |
|
---|---|
USB Networking After connecting the device with USB to your PC, you can connect to it via telnet (initramfs) or SSH (booted system). |
|
Internal storage eMMC, SD cards, UFS, ... |
|
SD card Also includes other external storage cards |
|
Battery Charging and battery level reporting works |
|
Screen Display works. Ideally with sleep mode and brightness control. |
|
Touchscreen |
|
Keyboard Build in physical keyboard |
|
Touchpad Build in Touchpad |
|
Multimedia | |
3D Acceleration |
|
Audio Audio playback, microphone, headset and buttons. |
|
Camera |
|
Connectivity | |
WiFi |
|
Bluetooth |
|
Ethernet |
|
Miscellaneous | |
FDE Full disk encryption and unlocking with unl0kr. |
|
USB-A Full-sized USB-A port works (Usually applicable to SBCs and laptops). |
|
HDMI/DP Video and audio output with HDMI or Display Port works. |
|
Sensors | |
Accelerometer Auto screen rotation works in desktops e.g. Phosh or Plasma Mobile |
Untested
|
Magnetometer Sensor to measure magnetism |
Untested
|
Ambient Light |
Untested
|
Proximity |
Untested
|
Hall Effect Also known as flip cover sensor |
Untested
|
Barometer Sensor to measure air pressure |
Untested
|
Power Sensor Sensor to monitor current, voltage and power. Not fuel gauge! |
Untested
|
The Qualcomm RBx generic ports is aimed at supporting various Qualcomm development boards, notably the RB3/5/3g2 and Rubik Pi 3. It can uses Linux next.
This is meant to be a reference platform for validating upstream support for the boards and enabling easy experimentation.
Contributors
Installation
Use pmbootstrap to build your own installation image.
The board must be prepared by installing U-Boot, prebuilt images can be found on the Linaro U-Boot fork release page alternatively you may build your own image by following the U-Boot documentation (see "generic boards" for the rb3).
After initialising pmbootstrap, run pmbootstrap install --password pmos
to create an image. The image can be exported to a known location with pmbootstrap export
and then flashed to the board using edl.py as follows:
First put the board into EDL mode by removing the power cable and holding the EDL button while reattaching power and USB. You can run dmesg -w
in a terminal and wait for the USB device to appear.
Then run (after installing edl in a venv or with pipx)
./edl.py --loader /path/to/rescue/prog_firehose_ddr.elf wf --lun=0 /tmp/postmarketOS-export/qcom-rbx.img
The firehose loader ELF can be obtained from a Linaro rescue package:
- RB3: https://snapshots.linaro.org/96boards/dragonboard845c/linaro/rescue/136704/dragonboard-845c-bootloader-ufs-linux-136704.zip
- RB3Gen2 and Rubik Pi 3: https://github.com/rubikpi-ai/prebuilt/blob/main/QCM6490_bootbinaries.zip
Unpack the ZIP and use the elf inside.
Custom kernel
It is possible to use pmbootstrap's "envkernel" logic to use your own kernel instead of the standard one. This allows your to compile a kernel as you typically would, and then produce a kernel package from the build artifacts that will be included in your image (or can be installed to your board with pmbootstrap sideload
).
The process is documented in Developing_with_postmarketOS#Mainline_kernel, just use linux-next
as the name of the kernel package.