Re: [PATCH v2 0/3] support for broken memory modules (BadRAM)

From: H. Peter Anvin
Date: Wed Jun 22 2011 - 14:15:52 EST

On 06/22/2011 04:18 AM, Stefan Assmann wrote:
> The idea is to allow the user to specify RAM addresses that shouldn't be
> touched by the OS, because they are broken in some way. Not all machines have
> hardware support for hwpoison, ECC RAM, etc, so here's a solution that allows to
> use bitmasks to mask address patterns with the new "badram" kernel command line
> parameter.
> Memtest86 has an option to generate these patterns since v2.3 so the only thing
> for the user to do should be:
> - run Memtest86
> - note down the pattern
> - add badram=<pattern> to the kernel command line

We already support the equivalent functionality with
memmap=<address>$<length> for those with only a few ranges... this has
been supported for ages, literally. For those with a lot of ranges,
like Google, the command line is insufficient.

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