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    SubjectRe: Linux 2.6.18-rc6
    On Tue, Sep 05, James Bottomley wrote:

    > On Wed, 2006-09-06 at 08:20 +1000, Benjamin Herrenschmidt wrote:
    > > Yes, it's a PCI error.
    >
    > Thanks, and the cat of /proc/scsi_host/host<n>/signalling?
    >
    > My suspicion is the register doesn't actually exist on this card so it
    > doesn't actually respond on the bus. However, on my equivalent
    > everything works; largely I think because the only PC's I have don't
    > know how to signal a PCI error.

    Where is that area mapped?
    It crashes already if I read port 0.
    Everything works if I also add the second hunk to disable signalling.

    Index: linux-2.6.17/drivers/scsi/aic7xxx/aic7xxx_osm.c
    ===================================================================
    --- linux-2.6.17.orig/drivers/scsi/aic7xxx/aic7xxx_osm.c
    +++ linux-2.6.17/drivers/scsi/aic7xxx/aic7xxx_osm.c
    @@ -2539,8 +2539,15 @@ static void ahc_linux_set_iu(struct scsi
    static void ahc_linux_get_signalling(struct Scsi_Host *shost)
    {
    struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
    - u8 mode = ahc_inb(ahc, SBLKCTL);
    + int i;
    + u8 mode;
    + for (i=0;i!=SBLKCTL;i++) {
    + printk("i 0x%02x ",i);
    + mode = ahc_inb(ahc, i);
    + printk("m 0x%02x\n",mode);

    + }
    + mode = ahc_inb(ahc, SBLKCTL);
    if (mode & ENAB40)
    spi_signalling(shost) = SPI_SIGNAL_LVD;
    else if (mode & ENAB20)
    @@ -2566,8 +2573,8 @@ static struct spi_function_template ahc_
    .show_iu = 1,
    .set_qas = ahc_linux_set_qas,
    .show_qas = 1,
    -#endif
    .get_signalling = ahc_linux_get_signalling,
    +#endif
    };


    -
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