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    SubjectRe: Busmaster DMA broken in 2.4.18 on Alpha
    On Mon, Mar 11, 2002 at 10:02:00AM -0500, Jay Estabrook wrote:
    > There are ISA cards, regardless of what ISA bus machine they are
    > plugged into, that are able to generate only something less than
    > 32-bits worth of address.

    Indeed, I missed that.

    > Since ISA devices don't have pci_dev structures, there's (currently)
    > no way to pass an ISA device-dependent DMA mask to the IOMMU routines.
    > Perhaps there needs to be an addition to the API that would allow
    > for this (pci_set_isa_device_dma_mask()) ???

    Yes, it would be nice to have something like this.

    Another workaround also seems to be possible - for ISA devices
    use mask other than 0x00ffffff _only_ if we don't have working
    IOMMU. This doesn't help to get older Miatas work with such
    type of ISA cards though...

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