mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
46 lines
1.1 KiB
Plaintext
46 lines
1.1 KiB
Plaintext
|
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
|
||
|
|
|