Delete me: Raspberry Pi 4 port status (Rev #39, changes)
Showing changes from revision #38 to #39:
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Overview
The Work Raspberry Pi 4 was launched in June 2019, and work on portingRISC OS to the Raspberry Pi 4 is still ongoing. Some components are not available, so this build is not yet suitable for new users.
Some For features users are that not wish working, to so assist this in build the is testing, not a yet development suitable for new users.ROM image is available from the Downloads page – be sure to choose the one marked “Beta RPi ROM”.
A development ROM image is available from the Downloads page – be sure to choose the one marked “Beta RPi ROM”.
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. |
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. |
How to get RISC OS running on the Pi 4
The non-availability of the USB ports is a limiting factor. To use RISC OS on the Raspberry Pi 4, you have three options:
UseConnect aUSB-ChubwithtoPowertheDeliveryandanexternalpowersupplycapableofdelivering3amps.ThisallowsUSBdevices(power input) port and use it tobeback-powerconnectedthe Pi. This is not guaranteed to work: relatively few hubs can back-power in this fashion, and you may need a 3-amp power supply to cope with thehubPipluggedasintowell as theUSB-C(powerdevices.input)port.- Supply power to the GPIO pins, freeing up the USB-C (power input) port for a conventional USB hub.
- If you have the WiFi HAT for the Raspberry Pi, input is possible via VNC – as no USB devices are needed, a standard power supply can be connected to the USB-C port.
See Software information: Raspberry Pi: Firmware for the firmware required for the Raspberry Pi 4, along with details of the changes needed to config.txt.
Further information
- ROOL announcement (02 July 2019)
- Discussion thread in the General forum
- Discussion thread in the Porting RISC OS forum
For more general information, see Using RISC OS on the Raspberry Pi.
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