how to use memmap= option

how to use memmap= option

[Long Wind]

I have asked Debian users, they don't seem to know
kernel 2.4/2.6 fail to boot on my PC
probably because it can't detect my memory
so I have to tell kernel memory map

the following is copied from kernel-parameters.txt:

memmap=exactmap	[KNL,X86] Enable setting of an exact
			E820 memory map, as specified by the user.
			Such memmap=exactmap lines can be constructed based on
			BIOS output or other requirements. See the memmap=nn@ss
			option description.



Could you tell me how to construct memmap= lines?

Re: how to use memmap= option

[Long Wind]

On 1/8/14, Long Wind <longwind2009@gmail.com> wrote:
> I have asked Debian users, they don't seem to know
> kernel 2.4/2.6 fail to boot on my PC
> probably because it can't detect my memory
> so I have to tell kernel memory map
>
> the following is copied from kernel-parameters.txt:
>
> memmap=exactmap	[KNL,X86] Enable setting of an exact
> 			E820 memory map, as specified by the user.
> 			Such memmap=exactmap lines can be constructed based on
> 			BIOS output or other requirements. See the memmap=nn@ss
> 			option description.
>
>
>
> Could you tell me how to construct memmap= lines?
>

Sorry, it seems that I have posted wrong list
If you could tell me which list I should join, I will very appreciate
I'm leaving the list

Re: how to use memmap= option

[Randy Dunlap]

On 01/08/2014 06:06 AM, Long Wind wrote:
> On 1/8/14, Long Wind <longwind2009@gmail.com> wrote:
>> I have asked Debian users, they don't seem to know
>> kernel 2.4/2.6 fail to boot on my PC
>> probably because it can't detect my memory
>> so I have to tell kernel memory map
>>
>> the following is copied from kernel-parameters.txt:
>>
>> memmap=exactmap	[KNL,X86] Enable setting of an exact
>> 			E820 memory map, as specified by the user.
>> 			Such memmap=exactmap lines can be constructed based on
>> 			BIOS output or other requirements. See the memmap=nn@ss
>> 			option description.
>>
>>
>>
>> Could you tell me how to construct memmap= lines?
>>
> 
> Sorry, it seems that I have posted wrong list
> If you could tell me which list I should join, I will very appreciate
> I'm leaving the list


No, this is the correct mailing list for your question (or use
linux-mm@kvack.org).

First you obtain a listing of your computer's valid memory map,
either from Linux booting on it (maybe not so likely on your computer)
or maybe from BIOS SETUP.

With that information, you construct a kernel command line with multiple
memmap= options.
You can see an example of this here:
http://lkml.indiana.edu/hypermail/linux/kernel/0809.1/0664.html


Hope that helps you.
-- 
~Randy