Re: Is framebufer driver a replacement for video driver?

["Antonino A. Daplas" <adaplas@hotpop.com>]

On Friday 05 November 2004 19:44, Mukund JB. wrote:
> Hi Geert,
>
> Thanks for that.
> Please, try to give me more clarity on the framebuffer driver by solving
> the below quires?
>
> > > Are you talking about the vesafb driver? This being  a generic
>
> driver,
>
> > > Will this driver work on any video card?
> >
> > Yep, `VESA' means the vesafb driver. It works on any video card with a
> > VESA 2.0
> > compliant BIOS.
>
> If vesafb module works for any card, what are the situations that make
> me write a new framebuffer driver for a new video hardware in the
> market?
>
> Is it like, the vesafb driver does not explore the card to the fullest
> extent?
> A framebuffer driver specific to Video card is just to explore the card
> features to maximum.
>
> Can u please tell me why to call "scr_readw" in accel.c file of riva
> directory doing?
> Also, I found NO readl, writel calls in the riva directory( framebuffer
> driver). Then, who is responsible for accessing the hardware here?
>

Because the supposedly OS-agnostic file uses direct pointer manipulation, which
does imply that this file is not trully OS-agnostic.

The rivafb in 2.6.10-rc1-mm3 is already ported to use readl/writel.
.
Tony




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