Hi prabhu
in uboot one can change uart port number in #define CONFIG_MXC_UART_BASE in uboot/include/configs/*board*.h file
please also check structure iomux_v3_cfg_t const uart1_pads[] in uboot/..mx6ul_14x14_evk/mx6ul_14x14_evk.c
and "console" parameter in Table 11. Common kernel boot parameters attached Release Notes
Best regards
igor
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