DRAFT: Sonata Trace #356
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DRAFT: Sonata Trace #356
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For example SRAM is 128 KiB, there's no DMA, there's no CHERIoT Debug module, there is a user USB etc.
Implement basic Sonata Trace functionality via Arduino ICSP connector. For now this just presents the microSD SPI traffic.
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This draft PR presents some debug/diagnostic functionality in nascent form. It exports a software-selected set of 4 signals over the Arduino ICSP header for inspection with a logic analyser. The signals appear to have good integrity even at 30MHz and have been instrumental in LCD and microSD bring-up.
It could be very useful for viewing events, gathering performance information inside the FPGA in real time.
Presently it taps onto the PWM device port and provides a single write-only control register. It could perhaps become a proper IP block on the TL-UL at some point, and arguably the multiplexing should move into pinmux. With the current sketch (built before pinmux arrived) there would then be no need for a separate module/functionality, but the intention is to add additional diagnostic functionality at some point.
@GregAC for awareness.