On 19 Jul 2003, Alan Cox wrote:
> On Sad, 2003-07-19 at 07:02, Geert Uytterhoeven wrote:
> > No, that's not so simple, because vesafb requests the linear frame buffer,
> > while vga16fb requests the VGA region.
Correction:
- vesafb uses
o request_mem_region() on the linear frame buffer
o request_region() on the 32 VGA registers (but the return code is
ignored because of vgacon)
- vga16fb doesn't use resource management (ugh)
- vgacon uses
o request_region() on the MDA/CGA/EGA/VGA registers
> In standard usage mode both of them use the vga registers for palette control..
Vesafb may use a protected mode BIOS call instead.
An additional complexity is that not only vesafb/vga16fb may claim the VGA
registers, but also vgacon. And it's allowed for vesafb/vga16fb to take over
vgacon.
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.orgIn 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
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