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    SubjectRe: [PATCH] pdcraid and weird IDE geometry
    On Thu, Jul 17, 2003 at 07:33:00PM -0700, Walt H wrote:

    > OK. Just got home from work. I've tried booting and specifying geometry
    > via hdg=79780,16,63 hdg=noprobe etc... The geometry is accepted,
    > however, drive access fails when trying to read the disk. This geometry
    > is the geometry reported by hde (my old drive without screwy geometry).
    > The code in calc_pdcblock_offset to calculate the offset is unchanged
    > in my patch (except the date type conversion to float) and calls
    > get_info_ptr for geometry.

    I don't understand. Did you introduce some float? Remove it immediately.

    You just replace

    lba = (ideinfo->capacity / (ideinfo->head*ideinfo->sect));
    lba = lba * (ideinfo->head*ideinfo->sect);
    lba = lba - ideinfo->sect;

    by

    lba = ideinfo->capacity - 63;

    Then everything works for you, I suppose.
    Subsequently we wait for other people with the same hardware
    and see how the 63 varies as a function of their setup.
    (Or maybe you can go into the BIOS and specify different
    translations yourself?)

    (By the way, didnt your boot parameters lead to ideinfo->head = 16
    and ideinfo->sect = 63?)

    Andries

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