Re: Trying to kexec on Allwinner A80 - Russell King

From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Corentin Labbe <clabbe.montjoie@gmail.com>
Cc: kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	mripard@kernel.org, wens@csie.org, ebiederm@xmission.com,
	linux-arm-kernel@lists.infradead.org
Subject: Re: Trying to kexec on Allwinner A80
Date: Tue, 7 Apr 2020 11:01:00 +0100	[thread overview]
Message-ID: <20200407100100.GJ25745@shell.armlinux.org.uk> (raw)
In-Reply-To: <20200407093253.GA4630@Red>

On Tue, Apr 07, 2020 at 11:32:53AM +0200, Corentin Labbe wrote:
> On Tue, Apr 07, 2020 at 09:12:57AM +0100, Russell King - ARM Linux admin wrote:
> > That was not reflected in the command lines given to kexec that you
> > quoted previously, so I'm now wondering if you're giving me the full
> > information.
> > 
> > In any case, based on the information you've supplied thus far, I have
> > no further suggetsions to make.
> > 
> 
> Sorry I have added --debug after my initial mail.
> But I am surprised that no debug output like "MEMORY RANGES" is done (like I got in my first try).
> I have started to patch kexec-tools to check it, and debug is enabled.
> Furthermore, I got in locate_hole:237 memory_ranges=0.
> So the memory region in struct kexec_info is not initialized (and so cannot be printed)

The memory region information is initialised by get_memory_ranges()
in kexec/arch/arm/kexec-arm.c, which reads /proc/iomem.

That is called from my_load(), which checks that info.memory_ranges
is non-zero.  If it's zero, it errors out with "Could not get memory
layout".

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 10.2Mbps down 587kbps up

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