Mini UART support for Raspberry Pi CM3 ?

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Hi

I have been trying to get the mini UART (UART1) to work in Barebox on the
RPI Compute Module 3+.  I already have the changes made in config.txt and
this works fine when I boot into the main Linux code.  However, in Barebox,
the output always comes out on the main UART (UART0) and that is wired to
the Bluetooth module on my platform.  I have tried modifying the device
trees and cannot seem to get any output.   I also ensured that I added the
RPI CM3 output target as a config in rpi_defconfig.   

I've tried turning off the PL011 config option and also changing the device
tree to reference UART1 and set the chosen stdout-path to point to this
UART, but when I do this I just get a lack of any serial output.

I am also wanting to use the alternate pins (32 & 33) for UART1, so I am
thinking that something else needs to be changed.  Has anyone managed to get
this to work?

Regards

John


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