The Raspberry Pi 4 was launched in June 2019, and work on porting RISC OS to the Raspberry Pi 4 is still ongoing. Many features are not working: it is not in any shape for a public release just yet.
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.
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:
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. |
For more general information, see Using RISC OS on the Raspberry Pi.