Re: [PATCH 2.6.24] mm: BadRAM support for broken memory

[H. Peter Anvin]

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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