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