I'm actually working on an ADS-based board. The thing is, I know that the GPIO must be muxed that UART5's register must be put into alternate mode.
Obviously this board I'm working on is different from the reference platform in that it only has 1 serial port. This is proving to be a challenge because the board has problems working with UART 1 (the default debug port on the LTIB platform) because of bus contention, so the only way is to work with UART 5. I've got this working in u-boot and it is sending and receiving just fine. I've also changed the include/asm/arch/uncompress.h file to point to UART5's base physical address, so when the kernel is decompressing it is printing "uncompressing linux ........ booting.." as it should.
From there on, silence. I've added console=ttymxc4,57600n8 and console=mxcuart,0x43fb4000,57600n8 to the bootargs but still, nothing.
Do you perhaps have pointers as to where I should change what so that the kernel pushes all its debug out of UART 5 / ttymxc4?