add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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# Locally computed:
sha256  0cc8bfd2a7cbba2f68e0c5767477634922287943c91dd9fcf029fc8b9d577858  fxload-2008_10_13.tar.gz