[imx8mm] How to customize the partition layout of .sdcard file?

[cherhow_na]

I'm using imx8mm evk board, with Yocto Linux build.

I need the board using my partition layout after flashing the emmc using UUU. 

Therefore, I want to customize the partition of the build out image "fsl-image-validation-imx-imx8mmevk.rootfs.sdcard".

Does anyone know which file need to be modified? Thanks.

[Rita_Wang]

Could you tell us which version of linux BSP are you using?