Re: Hardware Error Kernel Mini-Summit

From: Andi Kleen
Date: Tue Jun 15 2010 - 02:45:13 EST

> There was a case mentioned at the collaboration summit
> meeting where a BIOS bug mis-reported whether ECC was
> enabled - claiming it was on, when in fact it was off.

Yes I heard about that, but since it's not a single bit setting
there are lots of different ways it could be broken in theory.

To check it you really need to have a tool that knows about
all the registers and checks them all.

It's a bit like checking if someone speaks a foreign language
by asking them a single question with a one letter answer.

> of the chipset specific code against each other. An EDAC
> driver that tells you that ECC is enabled might be lying too,
> if it is looking at the wrong bit or the wrong register.


It's asking a question with a one word answer where you don't
know the correct answer.


ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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