Re: [Linux-ia64] 64 bit PCI DMA transfers?

From: David Mosberger <>
Date: 2000-09-07 08:11:33
>>>>> On Wed, 6 Sep 2000 12:29:19 -0700 (PDT), Nelson Escobar <> said:

  Nelson> Doing 64 bit PCI DMA transfers to memory less than 2 gigs
  Nelson> works fine.  When I use 4 gigs of memory, the physical
  Nelson> address of the last 2 gigs seems to be 0x100000000 -
  Nelson> 0x17fffffff.  When I try doing PCI DMA transfers into this
  Nelson> area, everything starts going wrong.

  Nelson> Is this a problem with the kernel?  Or is it a problem with
  Nelson> my driver? or both?

The kernel should handle this fine and if your driver is using the PCI
DMA interface, then it should work, too (assuming it's using it

Received on Wed Sep 06 14:11:43 2000

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