Hello,
I would recommend to review documentation regarding supported platforms on the websites of the various Linux distributions (Gentoo, Debian, Ubuntu, etc.).
Just redhat and suse or do others work as well?
RedHat dropped SPARC support after version 6.2. Suse dropped SPARC support after version 7.3. The version number indicates that this was many years ago.
Aurora Linux (that's SPARC) is based on RedHat http://auroralinux.org/ .
Michael