Kamal R. Prasad wrote:
all USB devices use full scatter-gather DMA. UHCI and OHCI are limitted I believe to 4GB of ram.
My usb device probably doesn't have a dma controller, so I don't think the bulk pipe can use any memory allocated by bus_dma. [Pl. correct me if Im wrong this].
thanks
-kamal
EHCI (USB2) has a 64 bit extension that allows all DMAs of data to be 64 bit addresses.
I don't know however which chips support the 64 bit extensions.
_______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
