Hi Thomas,

Thomas Zimmermann [off-list ref] writes:

Am 01.11.21 um 09:54 schrieb Sven Schnelle:

quoted

Thomas Zimmermann [off-list ref] writes:
Thanks, i wasn't aware as i normally don't do any graphics related
development. I take a look at dri and port the driver, which is
hopefully not too hard.

Sounds good.

The one big difference when converting is that DRM really wants
drivers to support 32-bit XRGB colors. It's not a DRM limitation per
se, but a requirement of today's userspace programs. AFAICS your fbdev
driver uses a 256-color palette format. So the DRM driver would have
to convert
XRGB8888 to 8-bit RGB332 and install a corresponding palette.

Right now the driver only supports 8 bit pseudocolor, because i wanted
to start with something easy to get the kernel fbcon running. I have no
idea (yet) how to switch the card into other color formats. And neither
how to do pseudo color with drm. But i'll figure it out i guess.

Don't worry, it's easy. Take a look at the cirrus driver for a simple DRM
driver. [1]

Great, i also picked that driver as a template. :-)

Thanks for your help and pointers, much appreciated!

Sven