POWER/PowerPC is widely supported by the major Linux distros. One thing you'll want to pay attention to is endianess. Most ppc/POWER platforms only support big endian (BE), but beginning with POWER8 little endian (LE/EL) is fullly supported along with BE. However kernels can only run in one mode at a time, and the major Linux distributions are shifting to LE and dropping support for BE.
If your CPU is POWER7 or below you'll need to load a distro with powerpc64, otherwise use powerpc64le.