8.0-RC1 panic attaching ppc

Attilio Rao attilio at freebsd.org
Thu Sep 24 13:16:34 UTC 2009

2009/9/24 Daniel O'Connor <doconnor at gsoft.com.au>:
> On Wed, 23 Sep 2009, Attilio Rao wrote:
>> 2009/9/23 Daniel O'Connor <doconnor at gsoft.com.au>:
>> > If I enable the parallel port on this Gigabyte MA7785GM-US2H I get
>> > a trap 12 when booting up.
>> >
>> > I forgot to take a picture of it at the time but I should be able
>> > to reproduce it tomorrow.
>> >
>> > Has anyone seen anything before? (a quick google showed nothing). I
>> > did not see it on 7.2(ish) on the same hardware.
>> Are you able to enable KDB in your kernel config and return a
>> backtrace here?
> Yes, here it is..
> pmap_extract() at pmap_extract+0x13a
> isa_dmarangecheck() at isa_dmarangecheck+0x7a
> isa_dma_init() at isa_dma_init+0xda
> ppc_isa_attach() at ppc_sa_attach+0x40
> device_attach() at device_attach+0x69
> bus_generic_attach() at bus_generic_attach+0x1a
> acpi_attach() at acpi_attach+0x9f8
> (there's more but I imagine the above is probably sufficient).
> I took pictures, they are here
> http://www.gsoft.com.au/~doconnor/SNC00111.jpg
> http://www.gsoft.com.au/~doconnor/SNC00112.jpg
> If I put the parallel port in EPP mode then it works, I presume that's
> because it doesn't require a DMA channel whereas ECP doesn't. I haven't
> enumerated the possibilities though :)

Can you try to get a kernel dump that we can analyze?
You would just need to recompile the kernel with options KDB, GDB and
debugging symbols.
Then we can do more on that.


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