Hi,
If you are referring to the SDK package for i.MX6ULL, it could be installed on Windows, and on Linux versions with support for the toolchain (GCC), and the downloadable code for i.MX is running bare-metal or FreeRTOS.
If you are referring to the BSPs available for the i.MX6ULL, they are Linux, built on Yocto project.
Debian or other Linux distribution could run on i.MX processors, but they are not released nor supported by NXP. You could take a look at the following Community documents with such kind of implementations, just for reference:
https://community.nxp.com/docs/DOC-330147
https://community.nxp.com/docs/DOC-328362
Hope this will be useful for you.
Best regards!
/Carlos
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