Linux 5.8 Important Device Tree Changes (Need Manual DTB file)

loverpi

There were some changes in Linux 5.8 for the Amlogic GXL family pertaining to the USB controllers. Before Linux 5.8, the USB controller was using the DWC3 driver. Because u-boot passes it's internal device tree to Linux and it is based on the older DWC3 driver, this causes USB devices not to function in Linux 5.8+. You need to manually override the device tree that u-boot passes to the kernel by supplying a generic dtb.
https://patchwork.kernel.org/patch/11492945/
We will add manual device tree to LOST to be able to force a specific DT by modifying an existing image soon.

miguelagve

if we're not installing an image from LOST, is it the same procedure as it was before? 

loverpi

If you are using Linux 5.8, you need to manually override the dtb passed to the Linux kernel with the device tree from Linux 5.8. If you are using Linux 5.7 or lower, you don't need to override the dtb. Overriding the dtb is highlighted here: https://forum.loverpi.com/discussion/713/u-boot-firmware-guide-for-la-frite-aml-s805x-ac
We are current working to add device tree override to LOST so you can modify the device tree used directly through LOST for a specific installation.

toto

I've installed Arch (kernel 5.8.0) from LOST and it seems I don't have USB working.

I understand I need to install https://github.com/libre-computer-project/device-tree/blob/master/aml-s805x-ac/linux-5.8.y.dtb

Please could you explain how to install the new dtb file?