I am using i.MX6DL. I am using UART1 port for GPS connection. I face a problem as cited, when i connect GPS to this port and start our device i.mx6 do not boot. if i connect the gps after i.mx booted everything works fine. ı checked configuration pins, i think they are correct, internal boot and boot from eMMC is set well. How can set i.mx6 in order not to look UART1 port?