Hello everyone! I've opened a PR for an SPI driver for the BCM2711 (Raspberry Pi 4B chip) here: https://github.com/apache/nuttx/pull/16428
I would appreciate any review, especially if someone has a Pi 4B and a breadboard SPI device they can try this out on. Unfortunately it appears only the SPI0 interface is initialized by the Raspberry Pi provided firmware/bootloader, so I haven't been able to get any results on the remaining interfaces. The BCM2711 documentation is quite limited and I would need to spend some time doing reverse-engineering on the Linux drivers or searching the web more than I already have. On the off-chance that anyone here has written bare-metal programs for the Pi 4B or knows about firmware initialization for the BCM2711, I would appreciate any help I can get in understanding how to set up the peripherals better! Best, -- Matteo Golin
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