Procedure to configure UART on Colibri-imx6ull

procedure for configure UART which is configured with some other functionality.

What exact hardware (module and carrier board) and software versions of things are you talking about? What exactly is it that you are trying to achieve and what exactly about which UART is it that you are in need of configuring?

iMX6ULL Colibri SOM module with 256MB RAM 128MB flash and iris carrier board. Trying to boot “Colibri-iMX6_LXDE-Image_2.8.5” using SD card, to configure UART8.
But not even able to boot from SD card, can you please the procedure?
we have referred following link:
https://developer.toradex.com/knowledge-base/boot-from-sd-card

iMX6ULL Colibri SOM module with 256MB RAM 128MB flash and iris carrier board. Trying to boot “Colibri-iMX6_LXDE-Image_2.8.5” using SD card, to configure UART8.

OK, by UART8 I assume you are talking about the additional optional UART on the SODIMM pins 88 (defaulting to SPI CLK), 86 (SPI CS), 72 (LCD RGB Data<5>) and 78 (LCD RGB Data<4>). You would need to adjust the device tree by disabling resp. default functionality, muxing resp. pins to your liking and enabling the UART8 functionality. Some information about device tree customisation may be found here:

https://developer.toradex.com/device-tree-customization

But not even able to boot from SD card, can you please the procedure? we have referred following link: https://developer.toradex.com/knowledge-base/boot-from-sd-card

Yes, the question you double posted per Email, right?