Recans A0

Recans A0 has two controllers, one is based on RP2040, the other on MCP2515.

To bring up the RP2040 CAN controller:

sudo ip link set can0 type can bitrate 1000000
sudo ip link set up can0
sudo ifconfig can0 txqueuelen 128

sudo ip link set can1 type can bitrate 1000000
sudo ip link set up can1
sudo ifconfig can1 txqueuelen 128

The MCP2515 CAN controller

sudo mount -o remount,rw /boot
sudo armbian-add-overlay /boot/overlay-user/sun50i-a64-spi1.dts
sudo mount -o remount,ro /boot

ls -al /dev/spidev1.0

Interrupt: STEP7 = PL11