[Intel-gfx] PRMs for older hardware

[Ruslan Kabatsayev]

Hello all,

On the project page [1] I've found PRMs for more or less modern GPUs.
But what about such devices as Atom N550 or 915G Express chipset?
Where can I find documentation about them? The DRM driver does support
them, but I can't seem to find the docs it's based on.

[1]: https://01.org/linuxgraphics/documentation/hardware-specification-prms

Thanks,
Ruslan