[Buildroot] How to change UART1 to UART3 on i.M6Q?

[Buildroot] How to change UART1 to UART3 on i.M6Q?

[Julia Ding]

I'm using 'imx6-sabresd_qt5_defconfig' this config.

I want to change UART1 to UART3.

Don't know how to change it.

Can someone give me some clue? Thanks.



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[Buildroot] How to change UART1 to UART3 on i.M6Q?

[Baruch Siach]

Hi Julia,

On Fri, Feb 23, 2018 at 02:29:10AM -0700, Julia Ding wrote:
> I'm using 'imx6-sabresd_qt5_defconfig' this config.
> 
> I want to change UART1 to UART3.
> 
> Don't know how to change it.
> 
> Can someone give me some clue? Thanks.

I assume that you you want the console over UART3 instead of UART1.

At the Buildroot configuration you only need to change the value of 
BR2_TARGET_GENERIC_GETTY_PORT from ttymxc0 to ttymxc2.

Whether this works or not depends also on the kernel device-tree. 
Specifically, pin-control, pin-mux, and UART settings. You might also need to 
change the U-Boot configuration. This is just a clue, as you asked. The 
details are not in scope for this list.

baruch

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[Buildroot] How to change UART1 to UART3 on i.M6Q?

[Julia Ding]

Yes, I want the console over UART3 instead of UART1.

I'm new in Buildroot. Can you help me more detail?

Dose kernel device-tree set in 'make linux-menuconfig'?
Where is the 'pin-control, pin-mux'?

Thank you.




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