add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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# Locally computed:
sha256 810b3798d316394f94096ec2797909dbf23c858e48f7b3830826b8daa06b7b0f grub-2.02.tar.xz