add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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# Locally computed
sha256 13669da744a0ba411bdb8e47fa47b6e19171646ae42c8dbb2735d12e555fb1a3 rtai-4.0.1.tar.bz2