linux-kernel - Re: [PATCH] ramoops appears geared to not support ARM

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Message-ID: <20111029125342.GB19187@n2100.arm.linux.org.uk>
Date:	Sat, 29 Oct 2011 13:53:42 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Marco Stornelli <marco.stornelli@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org, msb@...omium.org,
	linux-kernel@...r.kernel.org, sergiu@...omium.org,
	Bryan Freed <bfreed@...omium.org>, akpm@...ux-foundation.org,
	seiji.aguchi@....com
Subject: Re: [PATCH] ramoops appears geared to not support ARM

On Sat, Oct 29, 2011 at 02:42:42PM +0200, Marco Stornelli wrote:
> Ok, I understand, but other question: isn't there any way to reserve  
> normal memory? Or at least, hasn't the mem kernel option any effect from  
> that point of view?

mem= can be used to redefine the available memory to the kernel, but
then you have to have some way to define a region of the memory you've
excluded to the kernel to use for ramoops.

A platform can also use the memblock stuff to extract some memory
dynamically from the information passed from the firmware - by using
memblock_alloc + memblock_remove + memblock_free.  The memblock_remove
call will take the memory out of the available memory to the kernel,
and thus will prevent it being mapped.

This must be done via the ->reserve callback in the ARM board/SoC
record (it can't be done later because the memory will have already
been mapped.)
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