AMD64 Busmaster DMA failure !

I am porting a working 32 bit driver to amd64.

The driver does DMA as follows:

deviceDesc.Version = DEVICE_DESCRIPTION_VERSION;

deviceDesc.Master = TRUE; \

deviceDesc.ScatterGather = TRUE; \

deviceDesc.InterfaceType = PCIBus; \

deviceDesc.DmaWidth = Width32Bits; \

deviceDesc.DmaSpeed = MaximumDmaSpeed; \

deviceDesc.Dma32BitAddresses = TRUE; \

deviceDesc.InterfaceType = PCIBus; \

deviceDesc.MaximumLength = 0x20000;



The call to IoGetDmaAdapter() returns NULL on the 64 bit system while
working on the 32 bit system. The global boolean for 64bitaddress is true on
the 64 bit system.



Any suggestions ?? The PCI card is a 32 bit card.

Thanks



Des Bean


.

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