Re: atyfb in 2.5.51

Geert Uytterhoeven (geert@linux-m68k.org)
Fri, 13 Dec 2002 09:53:04 +0100 (MET)

On 11 Dec 2002, Alan Cox wrote:
> On Wed, 2002-12-11 at 20:43, David S. Miller wrote:
> > fbdev is nice, in the specific cases where the device fits the fbdev
> > model, because once you have the kernel bits you have X support :)
>
> fbdev also can't be used in some situations on x86. Deeply fascinating
> things happen on some x86 processors if you execute a loop of code with
> an instruction that crosses two different memory types.

Do you mean one load/store access to memory where the first and the last part
(e.g. first 2 and last 2 bytes for a 32-bit word) are to different memory types
(e.g. main RAM and video RAM on PCI)? If yes, where does that happen? If no,
can you please clarify?

(At first I thought you meant an instruction where the opcode crosses those
two memory types, but we don't put code in video RAM...)

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@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


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