Re: Question about ioremap and io_remap_page_range

Jonathan Corbet (
Thu, 27 Sep 2001 08:33:38 -0600

> > VIRT_ADDR = ioremap(BUS_ADDR); to map a section of PCI memory, and
> > X_ADDR = virt_to_phys(VIRT_ADDR);
> i'd suggest to read Documentation/DMA-mapping.txt in any recent kernel
> source, the bus_to_virt()/virt_to_phys() interface is obsolete and has
> been replaced by the pci_alloc_*/pci_map_*/pci_free_*() dynamic
> DMA-mapping API.

...or, of course, _Linux_Device_Drivers_, Second Edition, available online
at The DMA chapter covers
this API as well.



Jonathan Corbet
Executive editor,
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