update packages for rb493?

Where do I find the correct packages to update a rb493

I see directories fo x86, a couple flavors of mips, ppc,
But no atheros directory.

you need mipsbe packages for the RB4XX series

Atheros AR7130 and AR7161 are MIPSBE (Big Endian) processors. They use the 32 bit MIPS 24K processor core.

Tom