FreeBSD 8.0 hangs on boot with ACPI enabled

John Baldwin jhb at
Wed Jan 6 18:51:46 UTC 2010

On Tuesday 05 January 2010 4:39:07 pm Joerg Wunsch wrote:
> As John Baldwin wrote:
> > So this is actually way too early.  The specific issue I'm referring
> > to is ACPI setting the BAR to zero when ACPI is initialized long
> > before we ever get to this point.  Hmmmmm.  Can you get the output
> > of 'devinfo -ur' with ACPI enabled?  Also, you can maybe try setting
> > 'debug.acpi.disabled=sysres' from the loader.
> Unfortunately, it's getting even more puzzling now. :-/
> When I set debug.acpi.disabled=sysres in the loader, I no longer get
> the resource allocation failure, thus ahc0 correctly gets the 0xde00
> IO address range.  Nevertheless, the boot hangs by the time when it
> wants to detect the disks.
> When I don't set debug.acpi.disabled=sysres, I'm back at the resource
> allocation failure.
> The only way to boot FreeBSD 8 is to disable ACPI.
> Are you interested in the devinfo -ur output from the FreeBSD 6.2 boot
> CD-ROM?  I didn't spot anything interesting in it, but alas forgot to
> save it from the serial console link into a file.

Yes, I want to see what resources ACPI thinks the system resource devices 
should be using.

John Baldwin

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