Delete me: Raspberry Pi 4 port status (Rev #37)
category: RaspberryPi
Overview
The Raspberry Pi 4 was launched in June 2019, and work on porting RISC OS to the Raspberry Pi 4 is still ongoing.
Some features are not working, so as a result there are no prebuilt ROM images available for the Pi 4. If you wish to work on the port of RISC OS to the Pi 4, you will have to compile the ROM from source (see Further information below).
RISC OS builds for all previous versions of the Raspberry Pi (Pi 1, Pi 2, Pi 3, Pi Zero etc.) are still available from the Downloads page.
Current status
Components that work
| Date | Details |
|---|---|
| 03 Sep 2019 | UART0 fixed: access to the command line via the serial port now works. |
| 13 Sep 2019 | Add GICv2 interrupt controller support. |
| 16 Feb 2020 | Audio output now works. |
| 18 Feb 2020 | USB devices now visible via USB-C (power input) port. |
The non-availability of the USB ports is a limiting factor:
- The Pi4 can optionally be powered via the GPIO pins, freeing up the USB-C (power input) port for a conventional hub.
- If you have the WiFi HAT for the Raspberry Pi, input is possible via VNC.
Major components needing attention
| Item | Comments |
|---|---|
| Ethernet port | Ethernet is now “direct-attach” rather than “via USB” so a new driver needs to be written. |
| USB ports | The Pi 4 has a USB3 controller, which RISC OS does not yet support. |
| Memory addressing | Ethernet and USB now live above the 4GiB boundary in the memory map: RISC OS will have to add “address extension” code to be able to access them. |
Further information
- ROOL announcement (02 July 2019)
- Discussion thread in the General forum
- Discussion thread in the Porting RISC OS forum
- Ben Avison’s Work In Progress page on GitLab gives a run-down on how to get RISC OS loaded on the Pi 4 (it involves compiling the ROM from source, so You Really Need To Know What You Are Doing).
For more general information, see Using RISC OS on the Raspberry Pi.
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