DE2-115 Ethernet not working

The incompatible pointer warning is probably due to the fact rx_frame is unsigned char pointer, while the api function requires alt_u32*.

Anyway this is not likely to cause the processor to hang. I think you'd rather have a major problem in your bus system.

My guesses are:

- timing failing for some paths related to dma

- missing bus connections; i.e. descriptor memory must be connected both to nios data port and to sdgma master port.