Using alt_flash_open_dev with 'enable_reduced_device_drivers'

You also need to allow for the stack any malloc()ed data. The latter will be considerable....

Getting the bit-bang timing valid is easy, the most you'd need to do is write the same value to the io port a few times.

However a 100MHz nios probably can't do things too quickly anyway, especially since Avalon bus writes are synchronous (unless they've changed that for teh new version).

The 'memory utilisation' of 33% only include the used parts of the memory blocks - even though the rest of the blocks is typically unusable.