add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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# Locally computed
sha256    cdfbf5a7e8dc8fbbe0d6c1e83cd3bd3f2472160aac65684bb01ef661c626a8e4    Pound-2.7.tgz