timeout()/untimeout() API:
- Clients supply callout handle storage, thus eliminating problems of
resource allocation.
- Insertion and removal of callouts is constant time, important as
this facility is used quite a lot in the kernel.
The old timeout()/untimeout() API has been removed from the kernel.
Frodo ASIC, originally contributed by Mike Smith
<mike@pressed.spam.frisbee.net.au>, but reworked by me to:
- Essentially duplicate the dca driver, modifiying where necessary
to work with the APCI.
- Deal with the different Frodo autoconfiguration model.
- Don't attach a tty to the 0th UART - it's not really useful for much
more than the Domain keyboard.
- Added a routine to check for the existence of a DCA at select code 9.
On most models, the 1'th UART is mapped to select code 9 by the PROM,
and on these models, we do _NOT_ want to attach the device as an APCI.
However, on the 425e, this mapping does not take place, so we attach
as an APCI. The 2'th and 3'th UARTs always get tty instances.
- Add console support which will only be invoked on the 425e (i.e. check
for DCA at 9, and defer console to it if it exists).
