ichwd0: unable to reserve GCS registers

Doug Barton dougb at FreeBSD.org
Wed Jan 4 07:37:57 UTC 2012

On 01/03/2012 14:14, John Baldwin wrote:
> On Wednesday, August 03, 2011 3:55:17 am Doug Barton wrote:
>> On 08/02/2011 15:06, John Baldwin wrote:
>>> On Saturday, July 30, 2011 2:49:52 am Andriy Gapon wrote:
>>>> on 19/07/2011 18:16 John Baldwin said the following:
>>>>> Hmm, can you get devinfo -r output from a working kernel with ichwd loaded?  
>>>>> You might be able to just build the kernel with 'nooptions NEW_PCIB'.
>>>> I believe that I've got a similar problem with amdsbwd(4).
>>>> It needs some resources (I/O ports) that belong to ACPI.
>>>> The problem is that the driver attaches to isa bus which is under
>>>> isab->pci->pcib and those particular resources are not assigned to the Host-PCI
>>>> bridge.
>>>> I think that you already made a suggestion that perhaps isa bus should  directly
>>>> attach to acpi bus when acpi is available.  Not sure if there are any
>>>> alternative approaches.
>>> Can you try this:
>> Not so much. :) the first and last patches I can apply to HEAD by hand,
>> but /sys/dev/acpica/acpi_pcib_acpi.c is only 387 lines long, so I'm not
>> even sure where to start.
>> Any chance you could diff against HEAD?
> I believe this should be fixed (well, worked-around) by my most recent commit
> to sys/dev/acpica/acpi_pcib_acpi.c in HEAD.

Funny you should ask. :)  I saw that, and took a look. I'm getting the
following error, from a verbose dmesg:

isab0: found ICH10 or equivalent chipset: Intel ICH10DO watchdog timer
ichwd0: <Intel ICH10DO watchdog timer> on isa0
isab0: found ICH10 or equivalent chipset: Intel ICH10DO watchdog timer
pcib0: allocated type 4 (0x830-0x837) for rid 0 of ichwd0
pcib0: allocated type 4 (0x860-0x87f) for rid 1 of ichwd0
ichwd0: ICH WDT present but disabled in BIOS or hardware
device_attach: ichwd0 attach returned 6

That's different than the error message I got before, but watchdogd
still fails. I didn't have a chance to check the BIOS settings until
today, and there is no entry for anything even closely resembling this.
The only things I actually have disabled are the parallel port, and the
"Dell Trusted Platform Module," neither of which I can imagine would be

I'm happy to provide more info.



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