FPGA Active Open Source Projects

[NorthGuy]

I don't think that having two FPGAs interconnected is a terrible idea. Connect them over SPI or a parallel bus or whatever works. If my goal is to have a library of de/modulators for various analog and digital radio modes I think it'd be ideal to have the slaved FPGA available to load up whichever bitstream is called for at the time rather than trying to fit all possible de/modulators on a single FPGA.

This can be done with a single FPGA as well. You probably can do partial re-configuration to alter the design at run time, or you can have multiple configuration, or you can completely configure the entire FPGA from the PC with whatever bitstream you need.

[rstofer]

Somewhere on the Interwebs there is a project that uses a uC to select a configuration file to hand to the FPGA at boot time.

Here's one approach for managing an update copy while retaining a "golden" copy:
https://www.xilinx.com/support/documentation/application_notes/xapp1247-multiboot-spi.pdf

Here's a more general microcontroller approach:
https://www.xilinx.com/support/documentation/application_notes/xapp583-fpga-configuration.pdf

Neither of these are the project I was thinking about.  My Google foo isn't working today.