I am working on imx53 sabre tablet (imx53_smd) board. So far I am successfull in testing most of the peripherals.
Now i am stuck at a point where I cannot test UART4 and UART5. remaining UARTS are working fine.
I suspect from following reasons..
1. May be UART pads are not defined properly.
but I have added UART4 and UART5 pad definitions in iomux_v3_cfg_t mx53_smd_pads of mx53_smd.c
these ones :
even I have changed to iomux-mx53.h file as per the latest freescale kernel tree. for al the UARTS.
2. May be CSI0 interface is not allowing the UARTS to be used.
the connector on board has a 120 pin QTH connectorin which there are signals for auxillary display and camera
interfaces (CSI0). On the Same CSI0 interface you will find UART4 and UART5 signals. And I definitely dont need CSI interface.
so my guess is since CSI0 interface is still enabled so i cannot access the UART4 and UART5 signals.
So is there any way to disable the CSI0 interface. ?