add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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# Locally computed:
sha256 74ee708b68340b65519a04a22c61921cdcf69a1d308600c212414b28e9e689ac  stella-5.0.2-src.tar.xz