Hi Kamil,
we have different BSPs for iMX7D with different kernel versions starting from 3.14.52 to 4.9. You can find them at Freescale Public GIT > fsl-arm-yocto-bsp.git - i.MX Linux BSP Release Yocto Project manifests
There are also BSPs developed by a community external to NXP
These BSPs are developed with Yocto. Below you can find a Yocto training for getting familiar with the process of building an image
Regards,
Carlos
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