M^3, Mirteo and other future plans

Hi,

Summarizing some IRC discussions and taking them to the list - and 
adding some info.

M^3 - Milkymist Modular Mainboard
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The idea is to create a generic and minimalist board that can be reused 
in several different products.

Here are the rough specs:
* Artix-7 100 FPGA
* 4x DDR3 chips, 16-bit each. Memory chips are to be connected 
individually to the FPGA so that painful read/write leveling is 
unnecessary and the page hit rate (performance) is potentially 
increased. This detail is important as it precludes prototyping on a 
KC705 board which uses a SODIMM.
* "SPI" flash (4-bit fast version)
* Connectors to be placed on one side (for rack-mounting):
** Power
** 4x HDMI. The beautiful thing about the direct FPGA connection is that 
they can switch between video input and output. Also, no DAC.
** Ethernet (optional, the whole subsystem can be DNPd depending on 
product).
* Connectors to be placed at the front:
** 4x USB. Can be DNPd depending on product and rate of bugfixing.
** The USB signals should also break out on a HE10 connector so that the 
ports can be placed on the front panel of a rack, with a cable and adapter.
* Internal connectors (all direct FPGA connection):
** LVDS LCD panel. There is no standard pinout, try to find the most