NEEK example with ocm mmc_spi and mmu

Michael,

1. I think it should work with application selector.

2. I want to know if there is anything slow down the handling of a 115200 baud uart.

3. no sdcard change signal, there is no wire to fpga on the pcb.

4. it is a interface to the remote update ip core. please read the data sheet and driver code to find out. I've tried it yet.

5. they work similar. ethoc is more up to date and is in the mainline kernel. open_eth might be removed in the future.

- Hippo