linux-kernel - Re: Kexec couldn't reboot capture kernel on pandaboard ES with OMAP4460

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Date:	Thu, 11 Apr 2013 10:19:21 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Li Haifeng <omycle@...il.com>
CC:	pandaboard@...glegroups.com, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: Kexec couldn't reboot capture kernel on pandaboard ES with OMAP4460

On 04/10/2013 10:46 PM, Li Haifeng wrote:
> 2013/4/10 Stephen Warren <swarren@...dotorg.org>:
>> On 04/10/2013 03:35 AM, Li Haifeng wrote:
>>> Hi, everyone.
>>>
>>> Recently, I try to run kdump on pandaboard ES with omap4460. After
>>> load capture kernel by "kexec -l" and execute "kexec -e", the serial
>>> port output "Starting new kernel" and "Bye", then the system hangs up.
>>>
>>> I have tried the upstream Linux Kernel v3.4 and v3.8. All are with this issue.
>>
>> This is a shot in the dark. I assume you have SMP enabled. Can you use
>> hotplug to remove all CPUs other than CPU0, so that the kexec happens on
>> the boot CPU? That is certainly necessary for kexec to work correctly on
>> Tegra.
> 
> Thanks for your attention.
> 
> I do disable SMP feature. And the .config file for v3.8 could be found here:
> http://pastehtml.com/view/cylyrfejt.txt
...
> The output:
> [   57.373687] Starting new kernel
> [   57.377044] Bye!
> 
> Then system hangs.

Oh well, you've exhausted my knowledge I'm afraid! I can only suggesting
trying to enable earlyprintk and/or uncompressor debug in the kernel
you're kexec'ing and see if that yields any clue. Either that, or JTAG!
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