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Date: Tue, 04 Mar 2008 08:29:36 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Ingo Molnar <mingo@elte.hu>
CC: Rick van Rein <rick@vanrein.org>, linux-kernel@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 2.6.24] mm: BadRAM support for broken memory
References: <20080302134221.GA25196@phantom.vanrein.org> <20080303082238.GB13580@elte.hu> <47CC3005.5090706@zytor.com> <20080304133028.GC32383@elte.hu>
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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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