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I still don't understand the connection between uboot and kernel when you give it a "console=ttySMX0,115200n8" kernel argument ..
I know that the kernel when it sees that uses the argument as the console instead of the default tty1. But how does it know what serial port on the imx to use?
uboot will use its own independent driver, and this vanishes when the kernel in launched. You were correct about the functionality of the serial hardware earlier when you noted that the bootloader uses that hardware correctly. Your kernel commandline specifies which port to use as the console: 'console=ttySMX0,115200n8'.
I asked earlier whether there is a possibilty to specify, to the driver via kernel commandline arguments, details of the hardware. Did you explore this?