pci_alloc_consistent and memory >= 4GB pre CONFIG_ZONE_DMA32

[Cestonaro, Thilo]

Hey,

I've a problem with pci_alloc_consistent with Kernel 2.6.5 and memory >= 4GB on a x86_64 machine.
The device can't use the dma_addr which I retrieve from pci_alloc_consistent.
But if the machine has less then 4GB it works fine.

How can I prove that the adress I get from pci_alloc_consistent is dma compatible?
Should pci_alloc_consistent not be used in environments before CONFIG_ZONE_DMA32?

Is there a better way to get dma compatible memory since 2.6.1 (except using kmalloc and GFP_DMA, cause just below 16MB is not enough memory)?

I'm very appreciative for any answer / help.

Ciao Thilo
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