On Sunday 27 May 2007 23:53, John-Mark Gurney wrote: > Hans Petter Selasky wrote this message on Sun, May 27, 2007 at 22:35 +0200: > > I've got some reports back that some USB host controllers do not support > > transferring memory from a location higher than 2GB. > > > > What should we do about this? > > > > Should we limit all USB DMA allocations to the lower 2GB of the memory? > > No, a quirk table should be setup and pass the restriction to bus_dma > at tag initalization time when a broken controller is detected..
Yes, I can do that. But I am also thinking about a static quirk, like a sysctl you can set at boot time. I hope that this is not a wide-spread problem. And I am not surprised that hardware manufacturers are not specification compliant, which really makes me wonder if they support a true 64-bit address bus on the EHCI controller at all. I would maybe cost too much money? And therefore we should just stick with 32-bit addressing on 32-bit platforms aswell. --HPS _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "[EMAIL PROTECTED]"
