add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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CALIMAIN BOARD
M:    Manfred Rudigier <manfred.rudigier@omicronenergy.com>
M:    Christoph Rüdisser <christoph.ruedisser@omicronenergy.com>
S:    Maintained
F:    board/omicron/calimain/
F:    include/configs/calimain.h
F:    configs/calimain_defconfig