Re: [Qemu-devel] [PATCH 3/8] fdc: Introduce fdctrl->phase

[Peter Maydell]

On 19 May 2015 at 21:52, John Snow <address@hidden> wrote:
> Hmm, I think this is not purely derived state because the flags are not
> necessarily sufficient for regenerating that state.

Yeah, if there's genuinely an underlying state machine that's
not completely visible in registers you need to actually model it.
You should probably then model the register bits by calculating
them from the state rather than by changing them as you go along
in parallel with moving the state machine around.

-- PMM