am2 MBs - 4g + SCSI wipes out root partition
Gary Jennejohn
gary.jennejohn at freenet.de
Mon Oct 13 12:51:00 UTC 2008
On Mon, 13 Oct 2008 09:35:10 -0200
JoaoBR <joao at matik.com.br> 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.
---
Gary Jennejohn
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