@Andreas_Wolf: ELFv2 BE ABI works fine on ppc64. I've been using it since v6.2 and never had any problems with it. Kernel also gets a little bit smaller. As of v6.3 you can also build your BE kernel with clang/lld (at least clang-15 is needed), which was not possible before.

But AFAIK it's only a ppc64-thing. 32bit ppc uses a different ABI anyhow.