D-Link DIR-524 rev A1

"DIR-600M" is silkscreened on the board in the FCC photos.

DIR-600M on the OpenWrt forums
 * 2MB Flash, 16MB RAM, 333MHz BCM5356 CPU

On the DD-WRT forums (board shots)
 * Broadcom BCM5356A1 WiSoC
 * cFeon F16-100HIP Flash chip
 * ESMT M12L128168A-6T RAM chip

The FCC test report specifies the manufacturer as Risen Technology (SZ) CO., LTD... which seems to be (or is associated with) Shenzhen Allwins Technology.

Pictures
D-Link Images