Re: Boot time memory allocation

["Mark.Zhan" <rongkai.zhan@windriver.com>]

Ralf Baechle wrote:
> On Tue, May 09, 2006 at 03:35:14PM +0100, Alex Gonzalez wrote:
> 
>> I have two independent processors with access to a shared memory
>> region, mapped in the 256MB to 512MB region (kseg0).
>>
>> One is running a propietary OS, and the second one is running Linux 2.6.12.
>>
>> How would I arrange to leave that shared memory region out of the
>> scope of Linux's memory management system, but at the same time make
>> it possible for a driver to access it?
>>
>> I have done similar things before with the help of alloc_bootmem, but
>> this time I don't want the kernel to reserve the memory, I want the
>> kernel to be completely unaware of it, and I need to specify its start
>> and end.
> 
> At kernel initialization time just don't tell the kernel about the
> existence of your memory region.  For many systems that just means you
> shrink the memory region passed to the add_memory_region() call to
> something that suits your platform.
> 
>   Ralf
> 

Maybe it is a more flexible way to specify the memory regions via 
command line. You know, this will produce User-defined memory regions to 
kernel.