Re: [Qemu-devel] [PATCH] hw/sun4m.c fix power addresses

[Robert Reif]

Blue Swirl wrote:

> On 1/25/08, Robert Reif <address@hidden> wrote:
>  
>
> > Blue Swirl wrote:
> >
> >    
> >
> > > On 1/24/08, Robert Reif <address@hidden> wrote:
> > >
> > >
> > >      
> > >
> > > > diff -p -u -r1.81 sun4m.c
> > > >
> > > >
> > > >        
> > > This breaks my tests, so I guess a fix is also needed for OpenBIOS.
> > >
> > >
> > >      
> > Probably, they were tested using ss5/170 and ss10 openboot images.
> >    
>
> I just noticed that we have confused the devices that OBP calls
> 'power' and 'power-management'. Power or Aux 2 or Software Powerdown
> Control can be used to reset or power down the system. OBP trees
> confirm that it is located at 0x71910000 on SS-5 and 0xff1a01000 on
> SS-10/20. It does not exist on SS-600.
>
> Power-management a.k.a. APC is used to halt the CPU when idle. It is
> located at 0x6a000000 on SS-5. It does not exist on SS-x0 or SS-600.
>
> So, Aux2 on SS-10/20 and APC on SS-5 should move to the correct locations.
>
> Now, what to do with the rest? These are motherboard devices, they
> cannot be added to or removed from real life hardware. Leaving the
> devices out to improve historical accuracy would mean that the system
> can't be reset or powered down on SS-600, and on SS-10/20/600 Qemu
> will consume 100% of host CPU even when the target is idling. This
> would not be an improvement in usability for sure.
>  
I have a patch waiting to fix the power/aux2 and also aux1.  It adds a 
seperate address for auxio.

power and AUX2 are the same devices on ss5,10 and 20 but at different 
addresse/offsets.  600mp doesn't have it.
auxio is AUX1 and are the sort of the same devices on an ss5 and 10/20 
but at different address/offsets.  600mp doesn't have it.
The AUX1 bit layout of an ss5 (SLAVIO) is also different from a 10/20 (SEC).

I'm not sure how power-management fits in there other than it's an sbus 
device: ffd50130 address@hidden,a000000