* [Linux-ia64] 64 bit PCI DMA transfers?
@ 2000-09-06 19:29 Nelson Escobar
2000-09-06 21:11 ` David Mosberger
0 siblings, 1 reply; 2+ messages in thread
From: Nelson Escobar @ 2000-09-06 19:29 UTC (permalink / raw)
To: linux-ia64
Hi,
Do 64 bit PCI DMA transfers work in the test7 kernel yet?
Doing 64 bit PCI DMA transfers to memory less than 2 gigs works
fine. When I use 4 gigs of memory, the physical address of the last 2
gigs seems to be 0x100000000 - 0x17fffffff. When I try doing PCI DMA
transfers into this area, everything starts going wrong.
Is this a problem with the kernel? Or is it a problem with my driver? or
both?
Nelson Escobar
nelson@myri.com
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Linux-ia64] 64 bit PCI DMA transfers?
2000-09-06 19:29 [Linux-ia64] 64 bit PCI DMA transfers? Nelson Escobar
@ 2000-09-06 21:11 ` David Mosberger
0 siblings, 0 replies; 2+ messages in thread
From: David Mosberger @ 2000-09-06 21:11 UTC (permalink / raw)
To: linux-ia64
>>>>> 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
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2000-09-06 21:11 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2000-09-06 19:29 [Linux-ia64] 64 bit PCI DMA transfers? Nelson Escobar
2000-09-06 21:11 ` David Mosberger
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox