Am Freitag, 17. Dezember 2004 12:16 schrieb li xinyi:
> >
> > 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?
I am not a specialist on ohci, but have a look at ohci_hub_resume()
> > 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?
Yes.
> > The open() defined in the fops for a certain major:minor is called.
>
> Then what is usb_opem() for?
It dispatches among the drivers sharing a major number, but you are
not required to use the usb major.
Regards
Oliver
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