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

From: Alan Cox (
Date: Fri Dec 13 2002 - 22:41:52 EST

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

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This archive was generated by hypermail 2b29 : Sun Dec 15 2002 - 22:00:30 EST