systems: add Altera NEEK board

[fjullien]

This patch adds supports for the Altera NEEK board. For now, the systems only contains a gpio and an uart.

Signed-off-by: Franck Jullien franck.jullien@gmail.com

[olofk]

Nice. More ports are always welcome! A few comments below:

• It might be nice to break out the ddr model if we have more boards that want to use it, but we can keep it internally in neek until that happens.
• It looks like you have added private copies of vlog_tb_utils and wb_bfm inside systems/neek/rtl/verilog/wb_altera_ddr_ctrl. Is that intentional?

[fjullien]

Well, I could move the ddr model into cores. That was my first intention but I didn't do it. Need to remember why.

I have wb_bfm inside my wb_altera_ddr_ctrl because I have a test bench there and it uses wb_bfm. Because this bench is not run by fusesoc I need a local copy. I could of course move the wb_altera_ddr_ctrl to orpsoc-cores with a *.core file.

I have the Neek's LCD working now so I'll update this patch one more time.