Messages in this thread | | | Date | Thu, 2 Nov 2006 05:41:28 -0700 | From | Matthew Wilcox <> | Subject | Re: unchecked_isa_dma and BusLogic SCSI controller |
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On Wed, Nov 01, 2006 at 05:33:58PM -0800, Randy Dunlap wrote: > unchecked_isa_dma - 1=>only use bottom 16 MB of ram (ISA DMA addressing > restriction), 0=>can use full 32 bit (or better) DMA > address space > > > It is hard for me to see why BusLogic controller would only do DMA > > in low 16MB. Is there a fix for this? > > Does anyone know that controller hardware and its limitations?
I don't, but:
if (pci_set_dma_mask(PCI_Device, DMA_32BIT_MASK )) continue;
So somebody thinks the device can do 32-bit addressing. I would expect that setting unchecked_isa_dma is a historical mistake. However, I don't have any cards of this type to test.
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