Re: DMA from SCSI controller to PCI frame buffer memory.

[Alan Cox]

On Fri, 2002-12-13 at 19:15, Jason Howard wrote:
> Hello All,
> 
> I am wondering if the functionality exists in the Linux kernel to DMA 
> from a SCSI controller directly into frame buffer memory of a PCI video
> card?  Is there a standard method for this (similar to sendfile) or will
> it require some hacking?

In theory you can mmap the frame buffer memory, then do O_DIRECT I/O
into it. In practice it will buffer (I hope it still does). One of the
problems is that there are huge lists of PCI->AGP DMA errata in
chipsets.