MMIO means: memory mapped io (=MEMORYMAPPED)
I agree that confusion is indeed possible.
Linux-2.0.X does not support MMIO though PCI bus on Alpha. So option
IOMAPPED should be set to Y for NCR53C8XX driver.
Otherwise, the system will crash at start-up.
In driver revision 1.12c, the driver just ignore this option and forced
IOMAPPED on Alpha. I have removed the corresponding stuf (#ifdef
__alpha__) for Linux-2.1.something_that_supports_pci_mmio_on_alpha.
I will add a condition involving LINUX_VERSION_CODE for 2.0.X in the next
revision of the driver.
Sorry if you had problems under Alpha with the driver 1.14/a/c.
On Mon, 11 Nov 1996, Michal Jaegermann wrote:
> Gerard wrote:
> > >
> > >As you know, under linux-2.0.X/Alpha, memory mapped io does not work.
> > >So, if you update the driver to 1.14 in a 2.0.X kernel, you _must_
> > >force NORMAL IO,
> Well, yes, I though so from some earlier postings.
> > >i.e : CONFIG_SCSI_NCR53C8XX_IOMAPPED=y
> I always thought that "_IOMAPPED=y" will set memory mapped io, which
> on axp does not work. Am I misreading something? To add to this
> confusion all NCR controllers (a few) for which I left
> # CONFIG_SCSI_NCR53C8XX_IOMAPPED is not set
> seem to be working just fine (and quite heavily on occasions).
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