Rock 4C+ - Need J1939 kernel module support... How to rebuild the kernel?

Hi All,

Can anyone point me to a guide on how to build the kernel for a Rock 4c+?

The Radxa images are built with CAN support but do NOT have the J1939 / TP modules enabled. I need to rebuild the kernel with these options turned on.

I did manage to get 1 Armbian image to boot (which does have J1939 support) but its an old image and the USB does not work correctly. To make things even more interesting, I have 3 x R4c+ boards BUT only 1 of them will work with Armbian, the rest wont boot… Any ideas why? All of the boards work fine with Radxa images? Is it a bootloader issue???

Thanks.

Wondering if this is what you are looking for ? https://github.com/armbian/build