Michael Chan wrote:
If CONFIG_HIGHMEM is not set,
wouldn't the device get > 32-bit DMA addresses that it cannot handle?
No -- presuming your PCI device's DMA mask is set correctly.
I know that there are 64-bit systems without IOMMUs. That's why we need
[...]
needed or not. These systems without IOMMU must support 32-bit only
cards, right? How do they do that if they are not using CONFIG_HIGHMEM?
pci_set_dma_mask()
Jeff
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