[Buildroot] USB on rock64

[no-one-you-know]

> Default buildroot config for rock64 uses mainline kernel with
> default arch's generic defconfig which is not tailored for rock64.
> It might be possible that you have some newer revision than mine,
> which is not fully supported in mainline kernel.

I think you must be right.  I just downloaded 2019.11rc and built a vanilla image with just "make rock64_defconfig && make" and I can't get anything out of the USB ports.

> Couple of things to consider:
>
> 1.  you might want to change kernel version to newest one, maybe
>     your board is better supported in newer kernel.
>
> 2.  you can try and use kernel from ayufan that is made for rock64
>     (forked from official rockchip kernel repo) which surely will have
>     drivers mainline won't. He used to very actively support rock64 in
>     the past, I don't know how about now - last commit is 3 months old
>     (https://github.com/ayufan-rock64/linux-kernel)

Thanks for the info and advice.  It's appreciated.