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    Then why do we have 64-bit dma_addr_t on ia64 ?


    -----Original Message-----
    From: David S. Miller []
    Sent: Wednesday, June 27, 2001 2:26 PM
    To: MEHTA,HIREN (A-SanJose,ex1)
    Cc: ''
    Subject: Re: (reposting) how to get DMA'able memory within 4GB on 64-bit
    machi ne

    MEHTA,HIREN (A-SanJose,ex1) writes:
    > Is there a way for a driver to ask kernel to
    > give DMA'able memory within 4GB ? I read about
    > pci_alloc_consistent(). But I could not find out
    > whether that guarantees the DMA'able memory to be
    > within 4GB or not. Is there any other kernel routine
    > that I should call from Driver to get such a memory ?

    All of the pci_*() DMA allocation/mapping interfaces give you
    32-bit PCI dma addresses.

    David S. Miller
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