Re: Screen regen buffer at 0x00b8000

["Richard B. Johnson" <linux-os@analogic.com>]

On Fri, 20 May 2005, Linus Torvalds wrote:

> On Fri, 20 May 2005, Richard B. Johnson wrote:
> > Why can't I consistantly write to the VGA screen regen buffer
> > and have it appear on the screen????
>
> Don't do it.

Well I started out opening /dev/vcs, lseeking to 64, and writing
a string. This "sort of" worked, but screen attributes got messed
up so the "blue" screen attribute 0x17 ended up eventually being
black.

So, I decided to directly write. It doesn't work as you explain
because hardware scroll is being used.

> Anyway, you really _really_ shouldn't do anything like this in the first
> place.
>
> 		Linus

Yes, and I didn't want to. However a customer wants some status to
be always displayed in the upper-right-hand corner of a 4x5 LCD
with a tiny CPU board.


Cheers,
Dick Johnson
Penguin : Linux version 2.6.11.9 on an i686 machine (5554.17 BogoMips).
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