regarding the ohci spec, a overrun td might supply a full
packet of data. this change seemed to have caused nusb/kb to
fail with getting spurious zero byte reads. reverting for now.
implement SMM emulation driver handover in ohcireset(). this fixes
hang and defunct internal keyboard problems on a acer notebook.
dont spin forever waiting for the controller on soft reset in init().
check both, donehead pointer *and* interrupt status for
processed td event (Wdh) similar to the ohci spec example for
processed tds and unlink immidiately. acknowledge *all* the
interrupt status bits before masking. mask out unhandled
events.
various stuff:
check for christmas light interrupt status (cardbus controller
removed?)
add (missing?) break for Tddataovr error case in qhinterrupt().
(changed on sources, not clear why?)
mask interrupt events on shutdown() (from sources).
sometimes, the bios does not assign a interrupt line for pci
devices. this should not be fatal in case of mp ineterrupts
as long as there is intpin or msi can be used.
warn in intrenable() if we hit such a interrupt and set
irq to -1 to prevent it from getting enabled on the pic
or as isa interrupt in apic mode.
