I hadn’t updated my Raspberry Pi (a B+ model for my rpi-drd project) in about a year.
Pacman -Syu kept complaining about being unable to find files on any of the mirrors.
So I, without thinking, ran
reflector on an x86 host and copied it over. Oops. Now it definitely can’t find packages.
The archlinuxarm.org website gave me the hostname I needed, but not the entire URL. Put this in your mirrorlist (as the sole entry) to restore functionality:
Server = http://mirror.archlinuxarm.org/$arch/$repo