Re: IDE janitoring comments

From: Andre Hedrick (
Date: Mon Sep 23 2002 - 19:28:03 EST

Poke in your own special ide-ops function pointers.
This should have been allowed on a per chipset/channel bases.

Did I miss something?

On Tue, 24 Sep 2002, Richard Zidlicky wrote:

> On Sat, Aug 24, 2002 at 05:09:16PM +0200, Benjamin Herrenschmidt wrote:
> > - In ide-iops, the insw, insl, outsw, outsl functions are
> > broken for big endian. They should not do byteswap on these,
> > however, implemeting them with a loop of IN/OUT_BYTE/WORD
> > will cause byteswapped access on archs like PPC.
> > The problem is that the macros IN/OUT_BYTE/WORD don't define
> > non-swapping equivalents that would allow us to correctly
> > implement the "s" versions.
> we have one special problem on m68k, on some machines the IDE
> bus is byteswapped (unrelated to cpu endianness). For historical
> and performance reasons data to the HD is by default read and
> written in this "wrong" order (thus the bswap/swapdata option)
> and special fixup code is used in ide_fix_driveid (see
> M68K_IDE_SWAPW). However data returned by IDE_DRIVE_CMD is not
> treated in any way, so that eg WIN_SMART data end up in the
> wrong order on those machines and this is something I would
> like to fix properly.
> I figure I would define ata_*_{control,data} to handle special
> data resp raw HD data and modify ide_handler_parser to return
> specialised interrupt handlers or set some additional flag.
> Any thoughts?
> Richard

Andre Hedrick
LAD Storage Consulting Group

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