Re: ath0: unable to attach hardware

On Friday, December 07, 2012 4:59:37 am husyh_at_hush.com wrote:
> 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!

Adrian should be able to do that for you.  He knows which registers he wants 
to see.

> 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
> 
> 

-- 
John Baldwin