I've laid out a custom expansion board that plugs in to an EXP DOC expansion port and has an MCP2515 (and physical layer chip) connected to the SPI bus (CS1).
It looks like there has been a bit of work done with this combination... I'm new to using Linux with this sort of stuff though. I've got a few questions though... does anyone know:
1- Is there a driver for the MCP2515 compiled into the Onion Kernel?
2- Is can4linux compiled into the Kernel?
3- Has anyone been able to get the MCP2515 up and going?
It looks like someone did a bitbanged version of the driver, but I expect too much going on to rely on the timing with that version.