On 12/6/20 11:18 AM, Sven Schuchmann wrote:
> Hi all,
> I am new to the list so sorry for any errors.
> 
> I want to get Seeed "2 Channel CAN BUS FD Shield for Raspberry Pi" 
> https://wiki.seeedstudio.com/2-Channel-CAN-BUS-FD-Shield-for-Raspberry-Pi/
> get to work on a Raspberry Pi Compute Module 4 IO Board
> https://www.raspberrypi.org/products/compute-module-4-io-board
> 
> I have installed the Raspberry Pi OS with Raspberry Pi Imager
> 
> $ uname -a
> Linux raspberrypi 5.4.79-v7l+ #1373 SMP Mon Nov 23 13:27:40 GMT 2020 armv7l GNU/Linux
> 
> without any changes. Therefore I tried the following commands to load the overlay 
> 
> $ sudo dtoverlay spi0-1cs cs0_pin=24
> $ sudo dtoverlay mcp251xfd spi0-1 oscillator=40000000 speed=20000000 interrupt=18

Better add the overlays statically in the bootloader via config.txt:

| dtoverlay=mcp251xfd,spi0-0,interrupt=18

Marc

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Pengutronix e.K.                 | Marc Kleine-Budde           |
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