Linksys WRT54GC v3

Overview
"YM600A-1.0" is silkscreened on the board in the FCC photos.

Device is using a single chip Broadcom WiSoC + Switch

Links of Interest

 * Linksys WRT54GC on OpenWrt wiki
 * Linksys WRT54GC v3 on DD-WRT forums
 * PCB image