ath0: unable to attach hardware
husyh at hush.com
husyh at hush.com
Fri Dec 7 10:29:48 UTC 2012
Hello,
thank you for your answer.
Unfortunately, I'm unexperienced with FreeBSD, and am absolutely unfamiliar with hardware specifics. During this mail conversion, I have heard abour BAR for the first time, and therefore, I know neither what exactly I should do (e.g. how I can find the start of bar, which register offsets would be interesting, etc.), nor what the results would tell me.
I'm sorry if I'm tedious, but I would be very grateful if you could provide some more guidance.
Thank you very much!
On Dienstag, 4. Dezember 2012 at 7:43 PM, "John Baldwin" <jhb at freebsd.org> wrote:
>
>On Friday, November 23, 2012 5:56:02 pm Adrian Chadd wrote:
>> Thanks for this!
>>
>> I'm sorry it hasn't gotten any more attention. I've cc'ed john
>because
>> he understands the PCI-PCI resource allocation stuff and I
>currently
>> don't; I'm hoping he can stare at this and see what's going on.
>>
>> But yes, if it were an ath(4) problem, the NIC would be returning
>> 0xdeadbeef, 0xdeadc0de, etc. It wouldn't return 0xffffffff - that
>> happens when there's nothing mapped at that address.
>>
>> The PCI config space that you've provided shows BAR(0) is
>programmed
>correctly..
>
>Your dmesg shows that another device behind the same PCI-PCI
>bridge is working
>fine (fxp0), so the bridge is configured correctly. Also, the PCI
>command
>register for ath0 has memory decoding enabled, so everything
>should be fine
>from PCI's perspective. Note that if you want to examine specific
>registers
>you can use dd with /dev/mem (albeit carefully), e.g.
>
> dd if=/dev/mem bs=4 iseek=((start of bar + reg offset)/4)
>count=1 | hd
>
>to read a single 32-bit register. I think that the card is in
>fact returning
>the value you see from its registers. I would do some reads of
>other
>registers using dd to see if all of the device registers are
>returning -1 or
>if only certain registers are.
>
>--
>John Baldwin
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