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

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Message-ID: <CAFNq8R6mRJRygfnYvZgwVWOqsrhrjNUYzyZGU0cVsnE30W_xGg@mail.gmail.com>
Date:	Thu, 11 Apr 2013 12:46:07 +0800
From:	Li Haifeng <omycle@...il.com>
To:	Stephen Warren <swarren@...dotorg.org>
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

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 log and operation could be found here:
http://pastehtml.com/view/cylyfrb3a.txt

Some key setting list below.

bootargs:
rw vram=32M fixrtc mem=1G@...0000000 root=/dev/mmcblk0p2
console=ttyO2,115200n8 rootwait crashkernel=64M@...2000000

operation:
/ # ./kexec -l  --append="rw vram=32M fixrtc  root=/dev/mmcblk0p2 console=ttyO2,
115200n8 rootwait" uImage
/ # ./kexec -d -e

The output:
[   57.373687] Starting new kernel
[   57.377044] Bye!

Then system hangs.
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