Re: [Qemu-devel] General IO ports in pc386

[Markus Armbruster]

Tomas Bures <address@hidden> writes:

> Dear all,
>
> I'm preparing a class on embedded systems. I would like to make a
> client that interfaces with QEMU and the application running inside
> it. This client would simulate the physical environment that the
> application running inside QEMU should control. To achieve this, I
> would like to introduce use general IO ports (in a similar way they
> are used e.g. on ARMs). Please is there a simple way to emulate the
> general IO ports on pc386?
>
> If not, what would be the simplest way to create (i.e. develop) a new
> device for QEMU? Is there any intro or some simple device, which could
> be taken as a stub?

If you crusty old ISA is okay for you, the ib700 watchdog device
(hw/wdt_ib700.c) is really simple.  For PCI, maybe try the i6300esb
watchdog (hw/wdt_i6300esb.c).