How to tell whether ECC (memory) is enabled?

Thomas Zander thomas.e.zander at
Sat Nov 6 16:09:40 UTC 2010

On Fri, Nov 5, 2010 at 22:21, John Baldwin <jhb at> wrote:

>> During POST, die BIOS also tells me that ECC memory is installed, so
>> far so good. But I was a little surprised that the FreeBSD kernel
>> tells me absolutely nothing about it. Or do I have to tune loader.conf
>> variables?
> I think the EDAC register is using the registers for the QPI PCI buses.
> There is a driver now to export those PCI buses to the OS in 7.x+.  However,
> someone would need to port the EDAC driver (or something similar) to work
> with those devices.

I see. Thanks for clarification!
This means for now I have to trust the BIOS that ECC is enabled and I
should see MCA reports in the dmesg output once a bit error is


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