From mboxrd@z Thu Jan  1 00:00:00 1970
From: hmthalib <h.thalib@gmail.com>
Subject: Re: Where is MMU enabled?
Date: Tue, 10 Nov 2009 06:28:25 +0530
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To: Rick Brown <rick.brown.3@gmail.com>
Cc: kernelnewbies <kernelnewbies@nl.linux.org>, linux-newbie@vger.kernel.org

Rick Brown wrote:
> Hi List,
> 
> I am curious to know where is the MMU turned on in a Linux PPC system
> - is it the u-boot or the linux kernel?


It is Linux. u-boot uses the flat memory system.

  Since enabling of MMU shall be
> the point from where the CPU will have to generate virtual addresses -
> I think it should be somewhere in the kernel. The reason is that all
> the addresses that we give on the u-boot command line are physical
> addresses and not virtual, right (Thus implying MMU is not turned
> on?)?

yes. MMU is not turned on in u-boot

compare the data sheet and head_32.S for powerpc arch to know how the 
MMU is initialized .

> 
> Or is it that kernel always gets the control with MMU on on PPC systems?
> 
> How about other architectures?
> 
> Thanks,
> 
> Rick
> 
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> 


-- 
Regards,
Mohamed Thalib H
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