Re: 32-bit dma allocations on 64-bit platforms

Jesse Barnes
2004-06-24T13:50:23Z

On Thursday, June 24, 2004 2:18 am, Arjan van de Ven wrote:
> What is the problem again, can't the driver us the dynamic pci mapping
> API which does allow more memory to be mapped even on crippled machines
> without iommu ?
> And isn't this a problem that will vanish since PCI Express and PCI X
> both *require* support for 64 bit addressing, so all higher speed cards
> are going to be ok in principle ?

Well, PCI-X may require it, but there certainly are PCI-X devices that don't
do 64 bit addressing, or if they do, it's a crippled implementation (e.g. top
32 bits have to be constant).

Jesse