[linux-dvb] Re: dvb-kernel high memory ?

[Emard <emard@softhome.net>]

On Mon, Apr 14, 2003 at 12:25:30PM +0200, Holger Waechtler wrote:
> emard@softhome.net wrote:
> >HI
> >My budget crashes on latest CVS are because dvb-kernel
> >with 2.4.20 and 2.5.66+ does not support high memory
> >(up to 4GB) and therefore it crashes.
> 
> could you please explain a little more in detail what the problem is?

Set support for high memory (4GB) in the kernel, compile budget in 
the 2.5.x kernel and it will crash before booting complete kernel
(won't start init).

If dvb is module (I tried on 2.4.20), it will oops of course.


Problem is setting of DMA window, as in high memory model 
we may be overriding 1GB linear linux space (in 4GB model) or 
even 32-bit address space (in 64GB model) so different functions
are required for getting and setting the addresses to make sure 
they fall in the memory range useable or even reachable by 
the DMA. 

I don't know exact functions, but the thing slightly
resemles to old 80286 memory models small, compact, huge...

Emard


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