OpenCL OS for Terasic De10-nano?

Hi,

I've got a Terasic de10-nano chipset, and I've booted it off their compiled Angstrom linux distro (from https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=205&No=1046&PartNo=4 under 'BSP for OpenCL').

Works great, except that 'opkg update' doesn't work as the feeds.angstrom-distribution.org servers are down. I checked on github and apparently the Angstrom distro is supported by just 2 people.

Is there some other OS I should be using, rather than the Terasic recommended one? Is there a mirror for the Angstrom feed server?