Re: Document hadling of bad memory

Randy Dunlap
2008-12-01T18:57:19Z

On Wed, 26 Nov 2008 17:15:21 +0100 Pavel Machek wrote:

> Document how to deal with bad memory reported with memtest.
>
> Signed-off-by: Pavel Machek <pavel@suse.cz>
>
> diff --git a/Documentation/bad_memory.txt b/Documentation/bad_memory.txt
> new file mode 100644
> index 0000000..df84162
> --- /dev/null
> +++ b/Documentation/bad_memory.txt
> @@ -0,0 +1,45 @@
> +March 2008
> +Jan-Simon Moeller, dl9pf@gmx.de
> +
> +
> +How to deal with bad memory e.g. reported by memtest86+ ?
> +#########################################################
> +
> +There are three possibilities I know of:
> +
> +1) Reinsert/swap the memory modules
> +
> +2) Buy new modules (best!) or try to exchange the memory
> + if you have spare-parts
> +
> +3) Use BadRAM or memmap
> +
> +This Howto is about number 3) .

No space between 3) and '.'.

> +
> +
> +BadRAM
> +######
> +BadRAM is the actively developed and available as kernel-patch
> +here: http://rick.vanrein.org/linux/badram/
> +
> +For more details see the BadRAM documentation.
> +
> +memmap
> +######
> +
> +memmap is already in the kernel and usable as kernel-parameter at

a kernel parameter at

> +boot-time. Its syntax is slightly strange and you may need to

boot time.

> +calculate the values by yourself!

s/!/./

> +
> +Syntax to exclude a memory area (see kernel-parameters.txt for details):
> +memmap=<size>$
> +
> +Example: memtest86+ reported here errors at address 0x18691458, 0x18698424 and

s/here //

> + some others. All had 0x1869xxxx in common, so I chose a pattern of
> + 0x18690000,0xffff0000.

What is the 0xffff0000 for? Needs explanation.

> +
> +With the numbers of the example above:
> +memmap=64K$0x18690000
> + or
> +memmap=0x10000$0x18690000
> +

Please lose the last empty line.

and thanks for the patch/new file.

---
~Randy