I wrote a small script which downloads Advance Toolchain packages for the architecture where it is running. You can get the initial version here.
Or just issue:
git clone https://github.com/rpsene/POWER101.git cd ./scripts/advance_toolchain ./download.py
This first version only covers Ubuntu and Fedora for x86_64 and ppc64le. RHEL, SLES and Debian coming next 😀