Current distros doesn’t support many hardware platform, despite being very well funded. Compared to OpenBSD. (NetBSD is too much, right? and it is not really usable.)
Fedora: Only run on amd64, arm64, arm, ppc64le, s390x
https://www.openbsd.org/sparc64.html
The other architectures that OpenBSD supports have benefited because some kinds of bugs are exposed more often by the 64-bit big endian nature of UltraSPARC.
https://www.openbsd.org/want.html
It is important to spread sparc64 around the development community, since it is the most strict platform for detecting non-portable or buggy code.
Current distros doesn’t support many hardware platform, despite being very well funded. Compared to OpenBSD. (NetBSD is too much, right? and it is not really usable.)
Fedora: Only run on amd64, arm64, arm, ppc64le, s390x
Debian: i386, amd64, arm64, arm, ppc64le, mips64le, s390x, riscv64 (testing).
Alpine: same as Debian but no MIPS support
Add your own here.
There isn’t sparc64 support at all!
OpenBSD: alpha, amd64, arm64, armv7, hppa, i386, landisk, loongson, luna88k, macppc, octeon, powerpc64, riscv64, sparc64 (all equally supported except Alpha)
(VAX is discontinued after 6.9)