Messages in this thread |  | | Date | Thu, 27 Sep 2001 08:52:02 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: Question about ioremap and io_remap_page_range |
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On Thu, 27 Sep 2001, [GB2312] Êæ¹úÇ¿ wrote:
> Here is some rather basic questions I want ask ,any reply or comment > please CC to my emailbox,thank you very much. > > When I work with kernel 2.4.2 in Intel X86 , I use > > 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suggest to read Documentation/DMA-mapping.txt in any recent kernel source, the bus_to_virt()/virt_to_phys() interface is obsolete and has been replaced by the pci_alloc_*/pci_map_*/pci_free_*() dynamic DMA-mapping API. You can find some nice examples of usage in drivers/net/*.c.
Ingo
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