[PATCH 2/2] drm/tiny: Add ofdrm for Open Firmware framebuffers

[Benjamin Herrenschmidt]

On Thu, 2022-05-19 at 09:27 +0200, Thomas Zimmermann wrote:

> to build without PCI to see what happens.

If you bring any of the "heuristic" and palette support code in, you
need PCI. I don't see any reason to take it out.

> Those old Macs use BootX, right? BootX is not supported ATM, as I don't 
> have the HW to test. Is there an emulator for it?

It isn't ? When did it break ? :-)

> If anyone what's to make patches for BootX, I'd be happy to add them. 
> The offb driver also supports a number of special cases for palette 
> handling. That might be necessary for ofdrm as well.

The palette handling is useful when using a real Open Firmware
implementation which tends to boot in 8-bit mode, so without palette
things will look ... bad.

It's not necessary when using 16/32 bpp framebuffers which is typically
... what BootX provides :-)

Cheers,
Ben.

> Best regards
> Thomas
> 
> > Gr{oetje,eeting}s,
> > 
> >                          Geert
> > 
> > --
> > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org
> > 
> > In personal conversations with technical people, I call myself a hacker. But
> > when I'm talking to journalists I just say "programmer" or something like that.
> >                                  -- Linus Torvalds
> 
> -- 
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Maxfeldstr. 5, 90409 Nürnberg, Germany
> (HRB 36809, AG Nürnberg)
> Geschäftsführer: Ivo Totev