Re: framebuffer

["Harishankkar" <S.harishankkar@xxxxxxxxxxxxx>]

Hi ambar,
Thanx for the reply.What I am asking is that the frame buffer mode is like
a Standard VGA,where u don't have the card specific driver but it will run
on
any card without the driver.Let's take a eg of a bitmap .We will assume the
resolution to be 800x600.Now for each pixel there will be a entry in the
video
memory of tha value.If it's 8bpp then there will be 8 bits per pixel,if it
is
16bpp then there will be 16 bits in the Video RAM.This is what decides the
size
of the Video RAM.Now the VGA contoller reads in the value accordinglty and
adjusts the RGB value and puts it on the screen.It's the driver that writes
it on the
Video RAM the pixelvalues.In what way does this differ in the frame buffer
mode?
And how it does?fundamentally what does this frame buffer mean when compared
to
the above mentioned normal process.
Thanx,
Harishankkar.S
----- Original Message -----
From: Ambar Roy <ambarroy@xxxxxxxxx>
To: <linux-india-programmers@xxxxxxxxxxxxxxxxxxxxx>
Sent: Thursday, March 08, 2001 12:25 PM
Subject: Re: [LIP] framebuffer


> > Earlier in Redhat 6.1 when there was no support for SiS6326,framebuffer
> mode
> > was there.A framebuffer is nothing but the video memory.But what is  the
> > difference between this and the normal driver mode where we have 6326
> > driver?
> basically the framebuffer mode under linux is a special service provided
by
> the linux kernel! In the framebuffer mode, the linux kernel has the video
> drivers for the video card. This way you need to write just one x server
> which uses the framebuffer interface, and all the drivers can then be
> consolidated into the kernel. This has intresting uses other than x too. U
> can for example have a graphical boot up for linux (similar, but better
than
> the windows boot screens!) while the kernel loads, etc!
>
> Bye,
>     /\ |\/| |3 /\ r
>
>
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