Re: [issue1158] Problems with a SATA DVD burner

["Steve O'Hara-Smith" <steve@xxxxxxxxxx>]

	Hi,

	At least for me this problem has been cured by your changes
(Simon) for issue1240. Nice work much appreciated!

	If nobody else is still having problems (Hasso ???) I think
you can mark this as fixed in 9f2212d too.

On Tue, 16 Dec 2008 23:47:55 +0100
"Simon 'corecode' Schubert" <corecode@fs.ei.tum.de> wrote:

> Hasso Tepper wrote:
> > There is no solution yet, but I think that I already understand what's 
> > going on. The problem is that the fix I committed int atapi-cam doesn't 
> > have any effect in case of SATA controller in AHCI (or RAID) mode, so 
> > switching IDE controller into IDE or legacy mode might help.
> > 
> > I still have two questions ...
> > 
> > * How non aligned DMA transfer reaches this level at all. Should higher 
> >   layers try to avoid this?
> > * Where and how requests should be padded to be aligned to 4 bytes
> > (it's required for SATA ATAPI only?)?
> 
> It is an interesting question on where to put this alignment requirement. 
>   Sephe argued that our busdma functions already provide an alignment 
> tool, so maybe it is just being handled not well enough.  Apart from
> that, I think the ATA driver should take care of that and not the kernel.
> 
> cheers
>    simon
> 


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