am2 MBs - 4g + SCSI wipes out root partition

JoaoBR joao at
Mon Oct 13 06:19:58 PDT 2008

On Monday 13 October 2008 10:50:54 Gary Jennejohn wrote:
> On Mon, 13 Oct 2008 09:35:10 -0200
> JoaoBR <joao at> wrote:
> > On Saturday 11 October 2008 07:13:16 Jeremy Chadwick wrote:
> > > It's a driver problem.  If you want to use SCSI then you'll have to
> > > limit memory to 3.5 GB.
> I probably should have written - it seems to be a problem with ahc.  In
> general SCSI seems to work, as Scott has recently documented.  But see
> below.
> > well indeed with less then 4G installed it works flawless, so the
> > difference I see is that former athln64 MBs had memory hole remap options
> > or when 4Gig installed they only gave 3.something to the OS even under
> > amd64 - this is NOT the case with the AM2 MBs which should support up to
> > 8/16Mb onboard but wth this amount freebsd amd64 does not even boot when
> > a scsi adaptor is installed
> I'm beginning to believe that it's motherboard/BIOS related and not a
> general problem with ahc or any other SCSI driver.  I can say that
> at least with my Gigabyte GA-M61P-S3 I observed data corruption with
> 4GB of memory installed and with the BIOS mapping a part of memory
> above 4GB.
> Forcing the kernel to use only 3.5GB solved the problem.

exactly, I have the same MB and Gigabytes support changed Ideas with me, even 
released a newer bios version but at the end they insisted that it is an OS 
issue since this problem does not appear with windows and fedora



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