am2 MBs - 4g + SCSI wipes out root partition
freebsd at sopwith.solgatos.com
Mon Oct 13 16:25:56 UTC 2008
> > It sounds as if there's an implementation/design problem either in
> > FreeBSD's hardware compatibility support for AM2 (probably something
> > very low-level) systems, or there is a bug with these Gigabyte boards;
> good, but it is not only gigabyte, I experienced it on Asus, Abit, Epox and=
> MSI =20
Perhaps something common in the firmware/BIOS ?
> all this MBs have in common that when 4Gig is installed the full 4gig are=20
> avaliable to the Os, on former S939 arquitecture, depending on mem hole=20
> remapping setting in BIOS there was +/-3.5gig or 4.+Gig available for amd6=
> mostly the remapping feature was not existent and then there was always=20
> +/-3.5 Gig available
Is there some debugging flag to turn on that shows what the firmware/BIOS
says about addresses, and the final address map (both RAM and I/O devices)
as used by FreeBSD?
> > it could be either, or possibly both. It might work in Linux because,
> > for all we know, Linux may have workarounds in place for whatever the
> > problem may be. We simply do not know at this point.
IIUC, Linux uses the firmware/BIOS as little as possible and does
everything itself. Which is why *BSD can't run on LinuxBIOS.
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