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authorLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 15:52:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 15:52:13 -0800
commit1df2d017fe9d22a49bad157b4f5aa19212f29557 (patch)
tree8907fd08c5c367067768e79b3d98af2772cfa680 /Documentation/bad_memory.txt
parent022992ee59e90fef719493c09988884be157fb73 (diff)
parentd5b524327b2a482dddae3839ced8f8825074730d (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
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+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
+