Re: Who uses hdx=bswap or hdx=swapdata?

From: Chris Lawrence (quango@watervalley.net)
Date: Fri Jan 04 2002 - 04:31:04 EST

On Jan 04, Geert Uytterhoeven wrote:
> On Thu, 3 Jan 2002, Alan Cox wrote:
> > > Is the hdx=bswap or hdx=swapdata option actually in use?
> > > When is it needed?
> >
> > Certain M68K machines
> >
> > > The current implementation can cause data corruptions on SMP with PIO
> > > transfers:
> > >
> > > Is it possible to remove the option entirely, or should it be fixed?
> >
> > Show me an SMP Atari ST 8)
>
> IIRC it's used to access non-Atari IDE disks on Atari (which has a byte-swapped
> IDE interface) and vice-versa.
>
> So yes, you can use it on SMP machines, to access disks that were used before
> on Atari.

The byteswapping flags are also used by people hacking TiVos; the
non-MIPS models have byte-swapped IDE interfaces, and so the bswap
flag is needed to mount a TiVo disk on a PC.

Chris 

-- 
Chris Lawrence <cnlawren@olemiss.edu> - http://www.lordsutch.com/chris/

Instructor and Ph.D. Candidate, Political Science, Univ. of Mississippi
208 Deupree Hall - 662-915-5765
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