add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/README
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 There are various text files in the Documentation/ subdirectory,
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 several of them using the Restructured Text markup notation.
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-See Documentation/00-INDEX for a list of what is contained in each file.
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 Please read the Documentation/process/changes.rst file, as it contains the
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 requirements for building and running the kernel, and information about