Kernel panics running 5.4-RC3 and 5.4-STABLE on an AMD-64 with 8GB RAM

David O'Brien obrien at
Wed Apr 27 08:33:31 PDT 2005

On Tue, Apr 26, 2005 at 09:25:05PM +0400, Diomidis Spinellis wrote:
> David O'Brien wrote:
> >On Mon, Apr 25, 2005 at 08:48:26PM +0400, Diomidis Spinellis wrote:
> >>I am trying to make a Tyan S4882 (K8QSPro) motherboard with two 2.2GHz 
> >>Opterons and 8GB RAM to work with FreeBSD.  Both the 5.4-RC3 
> >>installation boot disk, and Thursday's 5.4-STABLE code panic.  The 
> >>system works fine with 4GB of RAM (it can run make buildworld), either 
> >>by physically removing the memory, or by adding "set hw.physmem = 4GB" 
> >>in boot/loader.rc.
> >
> >What BIOS version are you using, and what are your BIOS settings for
> >memory related things?  Do you have "Hardware memory hole" or "Software
> >memory hole" enabled?  Can use the full 8GB fine if you use "Failsafe
> >defaults"?  If you use "Optimial defaults"?
> I am using BIOS version 1.0.2.  Unfortunately, I've been unable to flash 
> a newer BIOS; the procedure fails with an error indicating that the BIOS 
> size did not mathc the image's size.  This happens with all BIOS 
> versions, including the one we are currently running.  I'm waiting a 
> reply from Tyan on this.
> These are the memory related BIOS settings.
> Advanced configuration:
> - 4GB memory adjust is set to auto (it can also be set to manual, in 
> which  case the hole size can be adjusted from 64MB - 2GB).

I would disabled this until you can upgrade to the latest BIOS.

> - Speculative TLB reload enabled

Disable this and see if that helps any.
> In PCI configuration:
> - IO MMU enabled , size 256MB

The IOMMU setting doesn't affect FreeBSD, so you could disable it if you

-- David  (obrien at

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