Re: PCI: Cannot allocate resource region 0 of device 0000:00:0d.0

[trooper ryan <trooper_ryan-QPf0Bz723pkjHdulDSg1yw@public.gmane.org>]

The card does work on an XP box I have, so I suspect it might be the PCI 
  riser card I'm using to slot it in to a 1RU box.  I'll try and locate 
another PCI riser to use and let you know how I go.

Thanks for all your help!



Matthew Wilcox wrote:
> On Sat, Apr 24, 2004 at 11:26:20PM +0000, trooper ryan wrote:
> 
>>Anyhow, the info you requested:
>># setpci -s 00:0d.0 BASE_ADDRESS_0=ffffffff
>>setpci -s 00:0d.0 BASE_ADDRESS_0 returns 00d7f008 sometimes and ffffffff 
>>others.
> 
> 
> This is quite suspicious.  ffffffff would indicate this device is not
> connected to the bus [1] .  The other value returned indicates it's a
> 32-bit BAR (entirely plausible) which is prefetchable (seems kosher for
> a video capture card).  The base address would then be 0x00d7f000 which
> is slightly under the 16MB boundary.  Very curious as this is normally
> assigned to system RAM.
> 
> All in all, this looks like a pretty broken piece of hardware to me.
> Possibly something else is going on to cause this, like the system being
> over its power-budget.  I advide you to treat this as a hardware problem
> and try doing some things to narrow it down, like taking all other cards
> out of the machine and seeing if the problem persists; try the card in
> a different slot; check the card connectors for damage, etc.
> 
> It'd also be worth trying a different OS with it, just to be sure it's
> a hardware problem ;-)
> 
> [1] Due to how PCI BARs work, there must be at least one bit clear.
> If it's a memory BAR, bit 0 must be clear, and if it's a port BAR, bit 1
> must be 0.  If there's no reponse from a device, the PCI bus floats high,
> so you get back 0xffffffff.  When you write 0xffffffff to a BAR, the device
> ignores the bits that are less than the size of the aperture so when you
> read it back, you should get only the implemented bits set.
> 


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