Re: PCI BAR1 Unassigned

From: Jan Zwiegers
Date: Thu May 19 2011 - 16:28:14 EST

On 2011-05-19 08:50 PM, Bjorn Helgaas wrote:
On Thu, May 19, 2011 at 10:28 AM, Jan Zwiegers<jan@xxxxxxxxxxxxxxxxxxxx> wrote:
I have the problem below where my PCI card's second BAR does not get
What can be the cause of this problem?
The last kernel I tested on which worked OK was 2.6.27.
My current problematic kernel 2.6.35.

05:01.0 Unassigned class [ff00]: Eagle Technology PCI-703 Analog I/O Card
(rev 5c)
Flags: bus master, slow devsel, latency 32, IRQ 22
Memory at 93b00000 (type 3, prefetchable) [size=2K]
Memory at<unassigned> (type 3, prefetchable)
Capabilities: [80] #00 [0600]
Kernel modules: pci703drv

Could be resource exhaustion or, more likely, we ran out because we
now assign resource to things that don't need them, leaving none for
things that *do* need them. This sounds like a regression, so we
should open a bugzilla for it and attach dmesg logs from 2.6.27 and

Does this problem keep the driver from working? (Sometimes drivers
don't actually use all the BARs a device supports.)


I'm the maintainer of the driver and was involved in the development of the board as well in 2003. The board uses two BARS and the second BAR is the most important. The board worked fine since the 2.4 days and only recently became problematic. I suspect it works on even later kernels than 27, maybe 2.6.32.

My knowledge is too little to actually determine if the problem is because the FPGA based PCI interface is not within spec or something that changed in the kernel, because of the post .30 releases becoming more strict to PCI specification, i.e. BIOS / Kernel interaction.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at