Re: ppc fails to attach to puc on 9.1-STABLE, 7.4-STABLE works

On Fri, 18-Jan-2013 at 17:58:49 +0100, John Baldwin wrote:
> On Friday, January 18, 2013 3:05:53 am Bruce Evans wrote:
> > On Thu, 17 Jan 2013, John Baldwin wrote:
> > 
> > > On Wednesday, January 16, 2013 10:10:34 pm Bruce Evans wrote:
> > >> On Wed, 16 Jan 2013, Andre Albsmeier wrote:
> > >>
> > >>> On Tue, 15-Jan-2013 at 21:27:07 +0100, John Baldwin wrote:
> > 
> > >>>>> [reading flags in the driver]
> > >>>> This should not be needed for "flags".  Look for 'devflags' in
> > >>>> sys/kern/subr_bus.c.  The kernel always reads the current 'flags' hint during
> > >>>> device probe and stores them in dev->devflags and leaves them there after a
> > >>>> successful probe (so they should be seen by attach).  Specifically, note:
> > >>>>
> > >>>> 		/* Set the winning driver, devclass, and flags. */
> > >>
> > >> So the flags interface is unusable before some driver "wins".
> > >
> > > No, we set it twice.  Specifically, it is set before each probe, then it is
> > > set again after a winning driver is chosen so that the proper flags exist
> > > during attach as well.
> > 
> > Why didn't it work for Andre then?
> 
> In followup e-mail he said it did work.  The one reason it might not have
> worked before is that if he did 'ppc.0.at=foo' and that forced the ppc device
> to be ppc1 instead of ppc0 in which case the ppc0 flags wouldn't have applied.

Well, in my despair (before the bug was fixed) I tried
also (and only):

hint.ppc.1.flags=0x2F

but this didn't work as well. If we want to dig into this,
I can plug another puc card in my desktop box (the other
one is sitting in a server where I don't want to do
experiments) and try to reproduce it here...

	-Andre

>  
> > It might be a layering problem, with the flags not working because the
> > hint says that they are for ppc but the bus name being puc.  I thought
> > that this problem was fixed.  In FreeBSD-~5.2, I had to add flags
> > reading to sio_pci.c and sio_puc.c to get flags for sio actually seen
> > by sio when the bus is not isa.  subr_bus.c does the 2 settings of the
> > flags much the same in FreeBSD-~5.2, but this certainly doesn't work.
> 
> I don't know off hand. :(
> 
> -- 
> John Baldwin

-- 
In a world without walls and fences, who needs windows and gates?
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