add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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# From https://www.gnu.org/software/classpath/announce/20120307.html
sha256    f929297f8ae9b613a1a167e231566861893260651d913ad9b6c11933895fecc8    classpath-0.99.tar.gz