Add support for the miniSpartan6+ to HDMI2USB

[mithro]

• Should be based on stuff at https://github.com/enjoy-digital/scarab-soc

Potential Issues:

• The memory on the miniSpartan6+ is quite slow?
• The USB interface can't emulate a real webcam
• The LX9 is probably too small, the LX25 should work?

[mithro]

@shenki has started work on this.

[shenki]

Attempt to build BaseSoC to ensure we can program the ms6+: https://github.com/shenki/HDMI2USB-misoc-firmware/tree/minispartan-testing

WIP port: https://github.com/shenki/HDMI2USB-misoc-firmware/tree/minispartan6

[mithro]

@cr1901 - See here for the miniSpartan6 stuff

[mithro]

Patches for openocd can be found at http://openocd.zylin.com/#/c/3117/

[cr1901]

OpenOCD JTAG works fine on miniSpartan6 using your patches. The flash proxy was broken last I checked however; powering the miniSpartan6 after loading data via the flash proxy does not execute the "flashed" bitstream.

Can someobody else who has a miniSpartan6 use OpenOCD and confirm this behavor w/ the flash proxy?

[mithro]

@cr1901 I posted updated information about the flash proxy (the old information was incorrect). Can you please try with them?

[mithro]

More work on this is available at https://github.com/mithro/HDMI2USB-misoc-firmware/tree/shenki-minispartan6%2B

[mithro]

This was fixed in #249! Yay!

Still a couple of features are missing (see #255) but I'm closing this for the more specific issues.