IDE & byte-swapping in 2.4.21

[Andre Hedrick]

Benjamin,

You are smoking crack !

SATA uses PIO taskfile in MMIO mode :-P

On 21 May 2003, Benjamin Herrenschmidt wrote:

>
> >
> > > There's just enough mapping and redirection & etc. in this code that
> > > I haven't quite figured out what the intent was, and therefore, haven't
> > > really figured out what the right fix is ... is it in the ide code?
> > > In the ppc64-specific code?  Am I the only big-endian platform with
> > > this problem? Have other big-endian platforms tested?
> >
> > No, yes, probably, yes.  IDE works fine on ppc32 (except for the
> > problems with CF cards on powerbooks with IDE interfaces with no
> > attached drives, but that's another story).
>
> One thing too here is why would you end up using the "mm" versions of
> the IOPs ? By default, IDE uses the "pio" versions (the one doing insw/
> outsw) and those should work fine for "normal" (read: common PCI)
> controllers. Unless you have a special memory mapped controller, like
> we have on pmac, you don't need the "mm" versions and the IDE code 'as is'
> should not have used them.
>
> Ben.
>

Andre Hedrick
LAD Storage Consulting Group


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