linux-kernel - Re: BUG: 32 Bit Kernel kexec hangs on P2020

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Date:	Thu, 11 Jul 2013 10:32:30 +0800
From:	"tiejun.chen" <tiejun.chen@...driver.com>
To:	Stefani Seibold <stefani@...bold.net>
CC:	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>, <kexec@...ts.infradead.org>
Subject: Re: BUG: 32 Bit Kernel kexec hangs on P2020

On 07/10/2013 06:00 PM, Stefani Seibold wrote:
> Am Mittwoch, den 10.07.2013, 16:48 +0800 schrieb tiejun.chen:
>> On 07/10/2013 04:39 PM, Stefani Seibold wrote:
>>> Hi,
>>>
>>> i have tried to kexec a 32 bit kernel on a Freescale P2020 dual core CPU
>>> (e500v2, revison 5.1 - pvr 8021 1051), but Kexec will hang after the
>>> "Bye!".
>>>
>>> The host and the kexec kernel are the same, based on the current kernel
>>> version 3.10.
>>>
>>> I have tried it with kexec-tools 2.0.4.git released 30 June 2013.
>>>
>>> Invoking kexec with
>>>
>>> kexec --command-line "1 maxcpus=1 noirqdistrib reset_devices $(cat /proc/cmdline)" -t elf-ppc --dtb=rs2020.dtb \
>>> --reuse-node="/cpus/PowerPC,P2020@...imebase-frequency" \
>>> --reuse-node="/cpus/PowerPC,P2020@...us-frequency" \
>>> --reuse-node="/cpus/PowerPC,P2020@...lock-frequency" \
>>> --reuse-node="/cpus/PowerPC,P2020@...ext-level-cache" \
>>> --reuse-node="/cpus/PowerPC,P2020@...imebase-frequency" \
>>> --reuse-node="/cpus/PowerPC,P2020@...us-frequency" \
>>> --reuse-node="/cpus/PowerPC,P2020@...lock-frequency" \
>>> --reuse-node="/cpus/PowerPC,P2020@...ext-level-cache" \
>>> --reuse-node="/cpus/PowerPC,P2020@...pu-release-addr" \
>>> --reuse-node="/cpus/PowerPC,P2020@...nable-method" \
>>> --reuse-node="/soc@...00000/bus-frequency" \
>>> --reuse-node="/soc@...00000/serial@...0/clock-frequency" \
>>> --reuse-node="/soc@...00000/ethernet@...00/local-mac-address" \
>>> -d -l -x vmlinux
>>> kexec -e
>>
>> Could you try again with one simple command like,
>>
>> kexec -l vmlinux --append="`cat /proc/cmdline`";kexec -e
>>
>
> Great, this works.
>
> I did more test and the issue for the fail is the passing of the device
> tree. But the device tree is exact the same as the previous used one.
>
> Is passing a new device tree not allowed?

No, I think this is not interdicted.

I suspect you probably don't pass a proper dtb, so you can take a further test 
to figure out this problem.

For example, in the u-boot prompt, you can use the fdt command to get last dtb 
after that board setup from u-boot, then pass that directly to try.

Tiejun

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