linux-kernel - Re: BAR 0: can't allocate resource

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Message-Id: <201001060919.48453.a.brooks@marathon-robotics.com>
Date:	Wed, 6 Jan 2010 09:19:47 +1100
From:	Alex Brooks <a.brooks@...athon-robotics.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: BAR 0: can't allocate resource

> > I have a problem getting a couple of PCI cards to play nicely together.
> > ...
> >
> > And (for both kernels) the output of lspci has the following line:
> >   01:04.0 Unclassified device [0080]: Device 0002:0080
>
> When you have only the 8-port serial card installed, it appears at
> 01:04.0.  When you have both cards installed, we don't see a new device,
> and whatever is at 01:04.0 no longer looks like the octal UART.

I'm pretty sure that it is the octal UART, but it isn't being recognised 
properly.  To test this theory, I tried with (a) no cards at all, and (b) 
just the MiniPCI adapter (no serial card) -- nothing else appears at 01:04.0 
(output of lspci attached).

> > Hardware Details:
> >  - My motherboard is a DigitalLogic MSM945.  It has a PC104 bus.
> >  - I have two PC104 cards:
> >    i)  8-port serial card (DiamondSystems Emerald-MM-8Plus)
> >    ii) PC/104+ to MiniPCI Adapter (ConnectTech) (no MiniPCI cards
> > installed).
>
> Do you have these two cards?
>
>   http://www.diamondsystems.com/products/emeraldmm8plus,
>   http://www.connecttech.com/sub/Products/PC104plus_MiniPCI.asp

Yes that's right.

> If so, both of those web pages mention jumpers that set the card's
> PCI device ("slot") number.  My guess is that both of your cards
> are set to the same number.

I'd already looked for this, I'm certain I have the jumpers right (I tried 
intentionally setting them incorrectly, the failure mode is different).


Alex

View attachment "lspci_noserial.txt" of type "text/plain" (1419 bytes)

View attachment "lspci_nocards.txt" of type "text/plain" (1420 bytes)