add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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# Locally computed:
sha256  a955053b36556ffa7c628ce18fd6de7d625966573fa412fb08869533d8f7385c  gpm-1.20.7.tar.lzma