The Broadcom BCM91480, also known under its codename Bigsur, is an evaluation board made by Broadcom for its SB-1A BCM1480 SOC. It features 4 1000baseT ethernet connections, 2 RS-232 ports and more and is fully supported by Linux.
All Bigsur systems use Common Firmware Environment; by default it's configured big endian. The endianess is controlled by DIP switch 2, contact 3. More interesting information might be found in the Common Firmware Environment source.
The Bigsur is supported in Linux 2.6 with 32-bit and 64-bit kernels.