On Thu, 19 Feb 2004 23:03:31 -0800 (PST) Linus Torvalds <[EMAIL PROTECTED]> wrote:
> > > On Fri, 20 Feb 2004, Benjamin Herrenschmidt wrote: > > > > > Well, we do. The pcibios_xxx routines get called for all PCI devices > > > during discovery, and that's when you'd fill them in. > > > > But what about USB or FireWire devices ? In theory, I'd like to see > > the driver for those not have to bother about beeing hosted by a PCI > > device or whatever else (there are typically non-PCI OHCI USBs on > > embedded platform, faking a pci_dev is becoming painful). > > Well, a USB device can't actually do DMA, so .. (it's only the USB _host_ > that does DMA, and while those aren't always PCI, they normally are). You miss how all of this stuff is being used :-) USB drivers do things like map DMA memory, and the generic DMA layer vectors it so that if the USB device is attached to a PCI host the PCI DMA mapping routines get used. ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
