Re: custom Pci netdevice using DMA

[Jeff Garzik <jgarzik@pobox.com>]

RANDAZZO@ddc-web.com wrote:
> All:
> 
> I have a PCI device (uses DMA), that was originally designed for an RTOS...
> 
> The device takes physical host address pointers (written to the card via bar
> space).
> 
> When data is received from the network, the pci card will DMA the data
> directly to the
> host asynchronously....
> 
> after a certain amt of data is received, an interrupt is gen'd and the host
> goes and looks at the data..
> 
> For transmitting, the host gives the pci device a physical host address
> value and the pci device will DMA the
> data, from the host, that is pointed to......
> 
> ...............................
> This above design does not work in Linux 2.4.  I understand that I must use
> the dma functions (pci_alloc_*,
> virt_to_bus, etc), but can't figure out what is the best way???


Documentation/DMA-mapping.txt, Documentation/DMA-API.txt

	Jeff