add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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# Locally computed:
sha256    11a5f5084488c480f3ff5a24d64d7147bb64272bf60a0ba51330a56c5b50cab9  ijs-0.35.tar.bz2