gNewSense 3 beta used on MIPS is Debian-based. It's difficult to install now, but otherwise works well on YeeLoong. Parabola GNU/Linux-libre also supports this hardware and has newer packages (for non-Loongson 2F-compatible MIPS hardware only gNewSense would work without rebuilding all packages).
A problem with ARM machines is that these which are widely available usually need nonfree firmware or don't have free BIOS.
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