Re: [Qemu-devel] Register uhci_reset() callback.

[Paul Brook]

> If any initialisation order might occur, then you really need all the
> states to be restored, including output levels, without any side
> effects, and then enable processing in all devices together.

There is no output or input level state, other than implicitly as part of 
device internal state. qemu_irq is a stateless mechanism for communicating 
level change events. In effect we only model edge triggering, and individual 
devices emulate level triggering on top of that.

Paul