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iMX28 Boot linux to use AUART as console instead of DUART

Question asked by Bruno De Paoli on Apr 12, 2017
Latest reply on Apr 12, 2017 by igorpadykov

We have an iMX28 based platform running linux 2.6.35, built using LTIB

I want to use one of the AUARTS (ttySP2) as the console instead of DUART (ttyAM0)

I configured the iomux for AUART2 operation, configured CONFIG_SERIAL_MXS_AUART_CONSOLE=y in the kernel and changed the boot command line to use ttySP2 as the console (console=/dev/ttySP2,115200 rdinit=linuxrc rw gpmi).


As far as I know this is all I need to do.


However the kernel starts and appears to simply hang and nothing gets printed on the /dev/ttySP2 interface. Everything works fine when I set the boot command line to use /dev/ttyAM0 as the console.


Is it possible to do this and is there something else I need to do to get it to work.