The Industrial Raspberry Pi Forum

Hi, I am trying to get the Pi5 CANbus to work with Balena OS. I have successfully loaded Balena and I am using dt overlays that work with a different MCP2515-based CAN hat. I doubt these are correct for RevPi. I'm unable to see the can devices in ifconfig. Could you tell me the correct overlays that I should be applying? Thank you!

Under Balena configuration, I'm using:
Define DT Overlays: Define DT Parameters for the Default Overlay:

Hi

there are several things:

- Connect 5 is using the mcp251863 controll, thus you need to use the mcp251xfd overlay
- Connect 5 uses a 20 MHz oscillator
- You must use the correct pins and SPI interface. The controller is connected to SPI1 with pin 11 as chip select (cs1)
- Controller for spi1 must be enabled with the spi1

Everything together results in the following two overlay definitions
If you're interested on the rest of the hardware or the overlay in general, you can find it here:

https://gitlab.com/revolutionpi/linux/- ... verlay.dts
https://gitlab.com/revolutionpi/linux/- ... verlay.dts

Nicolai

Thanks! I started looking through the overlay files and was almost there. I tried the overlays you recommended: After removing the default param that was causing a gpio conflict, I was able to get can0 working!
Working on can1 now...

CAN1 is attached to spi5 with irq=25, miso=13, mosi=14, clk=15 and cs=12

https://gitlab.com/revolutionpi/linux/- ... y.dts#L137

This would result in
Nicolai

I'm having trouble with that one. I tried adding it with the previous can0 overlay and also just by itself.

I get the following conflict:

root@balena:~# dmesg | grep spi
[ 3.009703] spi spi0.0: chipselect 0 already in use
[ 3.009712] spi_master spi0: spi_device register error /axi/pcie@1000120000/rp1/spi@50000/spidev@0
[ 3.009725] spi_master spi0: Failed to create SPI device for /axi/pcie@1000120000/rp1/spi@50000/spidev@0
[ 3.315641] spi_master spi0: will run message pump with realtime priority
[ 3.354154] mcp251xfd spi0.0 (unnamed net_device) (uninitialized): Failed to read Oscillator Configuration Register (osc=0xffffffff).
[ 3.354162] mcp251xfd spi0.0: error -ENODEV: Failed to detect MCP251xFD.

Please double check the overlay names. In your log file the error is about spi 0 and not 5.

Nicolai

Hi Nicolai, that's what is strange. I'm setting spi5 exactly how you wrote in your post, but the error is coming back as spi0.

Bump on this ^ Are you able to replicate with Balena?