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

From: David Mosberger <davidm_at_hpl.hp.com>
Date: 2000-09-07 08:11:33
>>>>> On Wed, 6 Sep 2000 12:29:19 -0700 (PDT), Nelson Escobar <nelson@myri.com> 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
correctly).

	--david
Received on Wed Sep 06 14:11:43 2000

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