Devuan
Today I installed Devuan. It works.
https://pkgmaster.devuan.org/devuan/dists/chimaera/main/installer-ppc64el/current/images/netboot/I have not done anything with it yet except try a few programs. Looks good for a new (and different) distro. It does boot very fast.
I used the mini.iso and the expert install option selecting the 5.10.0-9 kernel.
I'm also had to use the Realtec RTL8168e-2.fw nic firmware. Which I rescued from a x86 box.
I'm also using the AST graphics.
So far......So good.