8000 Implement UART loader support by GMMan · Pull Request #8 · kagaimiq/jl-uboot-tool · GitHub
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Implement UART loader support #8

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Implement UART loader support #8

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@GMMan GMMan commented Apr 12, 2025 •
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This PR adds documentation of the UART protocol and support for downloading and interfacing with the UART loader.

Resolves #3

To-do

  • Rewrite UART key documentation
  • Document UART loader protocol
  • Add UART adapter detection
  • Add UART loader downloading
  • Add UART protocol implementation
  • Try to get generic UART adapters working
    • I'm not sure there's really a good way to send the UART key without dedicated hardware. It could theoretically work if the UART signals were inverted (and I happen to have an adapter that's stuck like that, the useless thing), but I think it's probably better if a dedicated UART key + single line UART device was created, such as with a Pi Pico, which is out of scope of this PR.
    • Tested with a SparkFun Serial Basic on a blank AD155A4, which is always looking for a UART loader since it doesn't have valid firmware
  • Test on Linux (if generic UART adapters work)
    • Tested handshake and read with aforementioned hardware

@GMMan GMMan mentioned this pull request Apr 12, 2025
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@GMMan GMMan marked this pull request as ready for review April 14, 2025 15:03
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UART single wire FW upgrade
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