Host Firmware Notes
Some notes about the Linux host firmware (see this GitHub repo).
- UARTs don't work in DMA mode
- All UARTs (including the high speed RF TTY/serial spew) can only operate in interrupt driven mode. This is pretty inefficient
- GPIO IRQs don't work
- Kernel drivers (such as buttons) fail to get external interrupts
- Buttons need to be operated in polling mode
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