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qschulz: Maybe you remember my issue of not having any U-Boot Shell over UART2. I've found my issue. On the custom Board the signal SDMMC0_DETN/GPIO0_A3_u was pulled low by a MCU. Thus, Boot1 initialized the SD-Card interface which shares the Pin with UART2. U-Boot doesn't fully reinitialize this. Thus UART doesn't work until Linux fully re-initializes the UART2 interface during boot.
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