[linux-cirrus] Re: DMA for IDE

On Wed, 2005-10-19 at 17:14, Michael Burian wrote:
> zl wrote:
> >  
> > 
> > Downloaded and compiled the 2.6.  Booted and detected IDE drive, but could
> > not mount it.  Complained about bad block.  So can't test if it works or
> > not.  Tried their pre-built binaries, but none of them have IDE enabled.
> > 
> Does it work with DMA disabled?
> 
> If no, and it turns out that getting it to work isn't a trivial issue,
> I'd say that's a pretty sure sign that we should forward port from
> 2.4.21 instead.
> 
> > I have a 2.4.21 version that has DMA enable, and it seems working fine.  Do
> 
> What version are you using?
> The latest version from [1] or something else?
> 
> If your working version is different from the version [1] we should
> first check if there are relevant changes between them.
> 
> [1]
> http://arm.cirrus.com/files/linux/kernel/source/2.4/
> 
> > we base on 2.4 or shall we try to get their 2.6 to work first?
> > 
> 
> Good question - it all depends on the impression the 2.6 code makes.
> 
> Does it look like a copy of the old stuff or a clean rewrite?
> 
I gave a look to the cirrus 2.6.8.1 code, and it looks like an adapted
copy of the old code. It still uses some mapping function like
ep93xx_map_sg, that should know be replaced by function from the 2.6 DMA
API.

Since it is not a rewrite, I think you should forward port from 2.4.21
which we know is working.

Regards,
JP Francois

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