Linksys WRT54GC v3.0

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

Device is using a single chip WiSoC+Switch of some sort, probably Broadcom

Specs
Platform Serial Num. = ? FCC ID = Q87-WRT54GCV3 Industry Canada ID = 3839-WRT54GCV3 CPU Type = Broadcom BCM5354 KFBG HA0831 P13 879747 N2 MIPS Rev = ? CPU Speed = ? Bus = ? Flash Type = ? Flash Chip = ? Flash Size = 2 MB? Max Firmware Size = ? RAM Size = 8 MB RAM Chip = EM638165TS-6G M085910P739208.11YM ETRONTECH nvram Size = ? ETH chip1 = ? Switch = ? Port-based vlan = ? 802.1q vlan = ? Ethernet Port Count = ? Wired Standard = IEEE 802.3? Ethernet interface OUI = none specified boot_wait = ? bootloader = ? Flash Card Socket/Type = No SD/MMC Mod Support = No Expansion IF types = none specified PoE = No Power = 3.3 VDC, 2 A Connector type/size = Barrel plug LEDs/Color = ? Size = ? USB = No Serial Port = ? JTAG Port = ? Supported by TJTAG/Version = ? Special Features = ? Radio Wireless Radio = ? WLAN DSP processor = ? Wireless interface OUI = none specified Antenna Connector Type = ? MIMO status = ? Wireless Standard = IEEE 802.11b/g 802.11g = 6, 9, 12, 18, 24, 36, 48, 54 Mbps 802.11b = 1, 2, 5.5, 11 Mbps WiFi Operating Frequency = 2.4 GHz Radio cor_rev = ? Radio Capabilities = ? Other Default IP address = ? Default login user = ? Default login password = ? Default SSID = ? OEM = SerComm 3rd Party Firmware Support = ?

Links of Interest
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=149203

Pictures
FCCID Q87-WRT54GCV3