Messages in this thread | | | Date | Tue, 04 Mar 2008 08:29:36 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 2.6.24] mm: BadRAM support for broken memory |
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Ingo Molnar wrote: >>> >> How is this different from: >> >> memmap=<size>$<len> >> >> ... ? > > it's the inverse? When we identify bad areas of RAM, we really want to > "punch holes" into the existing memory map. So 'badram=' or > 'excludemem=' would be nicer and easier to use. > > Or extend 'memmap=' with an inverse parameter: memmap=!0x10000000$1M > would exclude a 1MB region at 256MB physical. >
My understanding is that the $-form (as opposed to the @-form or #-form) is exactly that:
memmap=nn[KMG]$ss[KMG] [KNL,ACPI] Mark specific memory as reserved. Region of memory to be used, from ss to ss+nn.
"Reserved" usually means "don't use as either memory or free address space".
-hpa
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