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=$
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