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From: Ralf Baechle <>
To: "Michael D. Crawford" <>
Subject: Re: Conserving memory for an embedded application
Date: Wed, 25 Sep 2002 02:52:38 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>; from on Wed, Sep 25, 2002 at 12:53:16AM -0400

On Wed, Sep 25, 2002 at 12:53:16AM -0400, Michael D. Crawford wrote:

> on.  An important concern is to minimize the amount of ROM and flash ram that 
> the device has, both to save manufacturing cost and to minimize power consumption.
> One question I have is whether it is possible to burn an uncompressed image of 
> the kernel into flash, and then boot the kernel in-place, so that it is not 
> copied to RAM when it runs.  Of course the kernel would need RAM for its data 
> structures and user programs, but it would seem to me I should be able to run 
> the kernel without making a RAM copy.

Flash is much slower than normal memory so if you want any performance
beyond the level of Eniac I suggest to copy it to RAM ...

> don't think the user program would be very large.
> Also, what is the minimum amount of physical ram that you think I can get any 
> version of the kernel later than 2.0 or so to run in?  I heard somewhere that 
> someone can boot an x86 system with as little as 2MB of RAM.  Is that the case?

That's rather old kernels and also heavily hacked.


  parent reply	other threads:[~2002-09-25  0:47 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-25  4:53 Michael D. Crawford
2002-09-24 21:59 ` Brad Hards
2002-09-25  0:52 ` Ralf Baechle [this message]
2002-09-25  5:18 ` Robert Schwebel
2002-09-25  6:25 Greg Ungerer
2002-09-30  0:38 ` Pavel Machek

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