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.
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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)