Support for Compute Module 4 (CM4)

[janisstreib]

To enable support for the CM4, we need to include the correct device tree bcm2711-rpi-cm4.dtb into the image. Unlike the other device trees currently included in Gokrazy, the mentioned CM4 device tree does not seem to be included into the upstream kernel yet. It can be obtained from the raspberry pi firmware repo though.

Workaround

To make the CM4 work with Gokrazy, you need to manually include this file into the boot image, until it is shipped with the kernel.

USB2.0 won't work until you add the dwc2.dtbo into the overlays folder in the boot partition (in conjunction with some variant of dtoverlay=dwc2,dr_mode=host in the config.txt). Additionally, support for your HUB needs to be included into the kernel.