> > The hci walks its lists on its own. DMA is initiated once and then > the hci works on its schedule which is described by descriptors in ram > which is read by DMA.
which piece of code initiated the DMA? > > PCI devices implement DMA on their own. Their is no equivalent to > the ISA DMA controller. Do you mean that in PCI case, OHCI comes with its own DMA controller, and this DMA takes care of all the transfers once it is initialised? > The open() defined in the fops for a certain major:minor is called. Then what is usb_opem() for? Thanks a lot Li Xinyi ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
