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Date:      Mon, 23 Feb 2009 09:05:22 -0500
From:      John Baldwin <jhb@freebsd.org>
To:        freebsd-sparc64@freebsd.org
Cc:        Marius Strobl <marius@alchemy.franken.de>
Subject:   Re: can anyone make available the whole usIII source tree from perforce please
Message-ID:  <200902230905.23149.jhb@freebsd.org>
In-Reply-To: <20090222170230.GB69979@alchemy.franken.de>
References:  <1233668470.1364.45.camel@main.lerwick.hopto.org> <499B5520.3040801@kasimir.com> <20090222170230.GB69979@alchemy.franken.de>

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On Sunday 22 February 2009 12:02:30 pm Marius Strobl wrote:
> On Wed, Feb 18, 2009 at 01:24:00AM +0100, Florian Smeets wrote:
> > On 04.02.2009 15:16 Uhr, Craig Butler wrote:
> > >Hi Marius,
> > >
> > >Thanks for all your hard work and pointers so far.  I have compiled and
> > >installed the new kernel (cas is statically compiled in).  Unfortunately
> > >its panic'ing on boot with the following;
> > >
> > >cas0:<Sun Cassini+ Gigabit Ethernet>  at device 10.0 on pci0
> > >panic: trap: memory address not aligned
> > >cpuid = 0
> > >Uptime: 1s
> > >
> > 
> > FWIW, i compiled a kernel with these changes and the cards probe fine.
> > 
> > cas0: <NS DP83065 Saturn Gigabit Ethernet> mem 0x2000000-0x21fffff at 
> > device 0.0 on pci1
> > miibus1: <MII bus> on cas0
> > cas0: 16kB RX FIFO, 9kB TX FIFO
> > cas0: Ethernet address: 00:03:ba:XX:XX:XX
> > cas0: [ITHREAD]
> > cas1: <NS DP83065 Saturn Gigabit Ethernet> mem 0x2400000-0x25fffff at 
> > device 1.0 on pci1
> > miibus2: <MII bus> on cas1
> > cas1: 16kB RX FIFO, 9kB TX FIFO
> > cas1: Ethernet address: 00:03:ba:XX:XX:XX
> > cas1: [ITHREAD]
> > 
> > I don't have a cable connected yet, as the machine is remote, but I'll 
> > be sure to test it soon.
> > 
> 
> FYI, the above panic likely isn't a problem of cas(4) but
> arises from the fact that the resource of that NIC starts
> at 0 according to its BAR, which is somewhat uncommon but
> nevertheless should work yet seems to trigger a bug at
> some other level.

The PCI bus driver assumes a BAR of 0 is an invalid resource.  There are many 
systems that use 0 to disable a BAR.  I have no idea if "0" is a magic value 
to disable an individual BAR in the PCI spec itself, however.

-- 
John Baldwin



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