ORPSoC fork (from git://openrisc.net/stefan/orpsoc) for de0_nano board (Altera Cyclone IV FPGA) with custom made expansion board.

Expansion board contains following features:

• etherned phy and RJ45 socket
• VGA output based on resistor ladder (4-bits per color)
• usb 1.1 phy and usb socket
• RS-232
• 2xPS2
• SD/MMC socket
• additional sdram chip

Board specific files are located in boards/altera/de0_nano directory. To synthesise the design just go to the root directory of the project and then:

cd boards/altera/de0_nano/syn/quartus/run
make all

If synthesis ends without errors, orpsoc.sof file will be generated in the same directory.