On Wednesday 16 May 2007, Hans Petter Selasky wrote:
> On the BSD platform there is something called BUS-DMA. Memory is allocated
> according to PCI device capabilities. This is because sometimes the PCI
> device is not capable of addressing the complete memory. Also you need to
> sync memory, like on the SUN architecture. Then you need to send specific
> commands to the PCI-bridge, for example "pshyco". From what I see your model
> will not work in all cases.
Those issues are handled by the DMA framework, transparently to USB.
> > Transfer descriptors are an artifact of one kind of host controller;
> > it'd be wrong to assume all HCDs use them.
>
> As long as the core information is not in the header of an USB transfer, like
> IP-packets have an header, you cannot ignore this.
Strange how it seems to work already though, having factored the
problem differently ... I think that word ("cannot") doesn't mean
what you think it means!!
- Dave
-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/
_______________________________________________
linux-usb-devel@lists.sourceforge.net
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
