add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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SFR NEUFBOX 4 SERCOMM BOARD
M:    Álvaro Fernández Rojas <noltari@gmail.com>
S:    Maintained
F:    board/sfr/nb4_ser/
F:    include/configs/sfr_nb4_ser.h
F:    configs/sfr_nb4-ser_ram_defconfig