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author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-08 15:52:13 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-08 15:52:13 -0800 |
commit | 1df2d017fe9d22a49bad157b4f5aa19212f29557 (patch) | |
tree | 8907fd08c5c367067768e79b3d98af2772cfa680 /Documentation/bad_memory.txt | |
parent | 022992ee59e90fef719493c09988884be157fb73 (diff) | |
parent | d5b524327b2a482dddae3839ced8f8825074730d (diff) |
Merge branch 'docs-next' of git://git.lwn.net/linux-2.6
* 'docs-next' of git://git.lwn.net/linux-2.6:
Fix a typo in the development process document.
Document handling of bad memory
Document RCU and unloadable modules
Diffstat (limited to 'Documentation/bad_memory.txt')
-rw-r--r-- | Documentation/bad_memory.txt | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/Documentation/bad_memory.txt b/Documentation/bad_memory.txt new file mode 100644 index 00000000000..df841621320 --- /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) . + + +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 +boot-time. Its syntax is slightly strange and you may need to +calculate the values by yourself! + +Syntax to exclude a memory area (see kernel-parameters.txt for details): +memmap=<size>$<address> + +Example: memtest86+ reported here errors at address 0x18691458, 0x18698424 and + some others. All had 0x1869xxxx in common, so I chose a pattern of + 0x18690000,0xffff0000. + +With the numbers of the example above: +memmap=64K$0x18690000 + or +memmap=0x10000$0x18690000 + |