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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] qemu/hw pckbd.c
Date: Wed, 18 Apr 2007 17:08:21 +0100
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To: qemu-devel@nongnu.org
Cc: Blue Swirl <blauwirbel@gmail.com>, l_indien@magic.fr

> > If you're interressed in such a feature, you may take a look of what
> > I've done in hw/ppc405_uc.c. There are some device sharing the same
> > memory page on those microcontrollers so I introduced a fake device
> > called mmio that allow to register multiple devices into a single page
> > in Qemu. I do use the serial_mm_init with the ioregister parameter set
> > to 0 for those designs.
> > This code may not be as generic as it would be if we want to make it a
> > standard Qemu function, but this may give a basis or ideas for it.
>
> On Sparc32 there are several devices that would benefit from sub-page
> granularity, so I vote for making this generic.

While you're fixing this, it would be good to fix overlapping devices as 
well ;-) Currently if you (temporarily) have overlapping regions then remove 
one of them you end up with unmapped memory. It may also make implementing 
flash devices simpler.

Paul