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    SubjectRe: [PATCH] M68k IDE updates
    On Mon, 14 Apr 2003, Paul Mackerras wrote:
    > Alan Cox writes:
    > > This looks the wrong place to fix this problem Geert. The PPC
    > > folks have the same issues with byte order on busses but you
    > > won't see ifdefs in the core IDE code for it.
    > >
    > > Fix your __ide_mm_insw/ide_mm_outsw macros and the rest happens
    > > automatically.
    > As I understand it, on some platforms (including some PPC platforms,
    > but not powermacs) one needs to byteswap drive ID data but not the
    > normal sector data. Or vice versa. Whether drive ID data needs
    > byte-swapping comes down to how the drive is attached to the bus. The
    > conventions used by other systems that we need to interoperate with
    > (e.g. other OSes, or just older kernels) determine whether normal
    > sector data needs byte-swapping or not.
    > Since __ide_mm_insw doesn't get told whether it is transferring normal
    > sector data or drive ID data, it can't necessarily do the right thing
    > in both situations.

    Indeed. Ataris and Q40/Q60s have byteswapped IDE busses, but they expect
    on-disk data to be that way, for compatibility with e.g. TOS.



    Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

    In personal conversations with technical people, I call myself a hacker. But
    when I'm talking to journalists I just say "programmer" or something like that.
    -- Linus Torvalds

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