Messages in this thread | | | Date | Mon, 11 Mar 2002 19:04:33 +0300 | From | Ivan Kokshaysky <> | Subject | Re: Busmaster DMA broken in 2.4.18 on Alpha |
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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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