Hi,

> >> > Trying to fix that by blacklisting vc4 (to make things continue on
> >> > simplefb, due to vc4 not yet supporting dsi) doesn't work for some
> >> > reason with the F25 beta image ...
> >
> > ... without success.
> 
> Not a usecase I've tried, have you tried blacklisting the vc4 module
> in something like "/etc/modprobe.d/vc4.conf"?

Yes.  Even tried to remove vc4.ko from the filesystem, suspecting that
blacklisting didn't work for some reason.  Didn't help.

> We might also need to add the touchscreen driver to the kernel. I'm
> not sure what is in the HW from the touchscreen PoV, I'll see if I can
> find out.

For touch to actually work yes, driver from rpi tree @ github must be
ported over.  IIRC it's connected via i2c.

Display output doesn't need the touch driver though.

cheers,
  Gerd
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