Hi,
Thanks for your feedback. If you are not using (nor planning on use any NXP BSP itself), we can recommend going to your NXP FAE/DFAE/representative for a channel on regards of support on 3rd party applications.
As for a specific Linux BSP, we don't have much information on regards of Hyperflash support. The only official support for Linux BSP seems to be for the NOR Flash available under the NXP reference boards.
On regards of the available support on Hyperflash, we understand that S32 Flash tool provides support as well as the Fls driver for the M7 core.
Aside from this, not much more information we are retrieve from this specific topic.
We do apologize.
Please, let us know.