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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,interrupts
      • whereas
    • Buttons userspace GPIO interrupt events simply don't seemneed to workbe operated in polling mode
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