grapefruit: add spd proxy passthrough #313
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nathanaelhuffman
approved these changes
Mar 19, 2025
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This plops down the SPD block in grapefruit with the commands to the internal FPGA controller disabled, effectively making it a CPU<->DIMM passthrough (exercising the SDA arbitration logic at low speeds, at least). The ruby boots with this image in place (all the activity shows the reworked G channel 0 ACKing and all the ensuing traffic):
I get to nanoblrs successfully.
My plan is to merge this and get it put into @citrus-it's Hubris dev branch. This means no more shuffling DIMMs around for you @nathanaelhuffman!