Compatibility with Quartus 5.1 and Nios 5.1

The ptf is generated by the sopc builder.

It is used by hwselect perl script to generate the memory map, io ports address and irq number for nios2 uClinux.

It must match your hardware.

If you use altera dev board, you should find it in your kits, (eg altera/kits/nios2/components/altera_nios_dev_board_cyclone_2c35/system/...).

Or if it is a custom board, built it with the minimal components as in the guide.