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Created by Evan Lojewski@meklortMaintainer

kestrel: Initialize rom with ecpbram contents to enable updates after synthisys

Please note that this isn't the pretties change, but it gets the job done. Ideally, the litex / ecp5 tooling would be updated to support this, but this was a quick and easy hack.

  • By default actual ROM contents are stuffed with random data generated from ecpbram -g. This is needed to allow ecpbram to properly stuff the bitstream later.
  • Initial ROM contents are saved to the gateware_folder as rom.init (needed for stuffing)
  • Actual ROM contents requested are save to the gateware folder as rom_data.init
  • Once the FPGA has been build, the .svf and .bit files are updated with the originally requested ROM.
  • Future ROM build can be replaced by using ecpbram / ecppack as stated in the readme.

Note: This requires https://gitlab.raptorengineering.com/kestrel-collaboration/kestrel-litex/migen/-/merge_requests/1 to function correctly.

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