linux-kernel - Re: [PATCH] ARM: keystone: add a work around to handle asynchronous external abort

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Date:	Tue, 18 Aug 2015 10:49:35 -0400
From:	Murali Karicheri <m-karicheri2@...com>
To:	Jisheng Zhang <jszhang@...vell.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	"santosh.shilimkar@...cle.com" <santosh.shilimkar@...cle.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <ssantosh@...nel.org>
Subject: Re: [PATCH] ARM: keystone: add a work around to handle asynchronous
 external abort

On 08/18/2015 04:28 AM, Jisheng Zhang wrote:
> On Tue, 18 Aug 2015 09:13:34 +0100
> Russell King - ARM Linux <linux@....linux.org.uk> wrote:
>
>> On Mon, Aug 17, 2015 at 08:09:17PM -0700, santosh.shilimkar@...cle.com wrote:
>>>  From the logs this seems to be mostly clock related issue for some
>>> peripheral. If the bootloader clock enable all hack still exists,
>>> may be you can try that out.
>>>
>>> Another way to debug this is to start disabling peripheral drivers
>>> from the kernel 1 by 1 and see if the issue goes away.
>>
>> Highly unlikely to make any difference.  As the failure happens soo early
>> with the patch applied, the kernel hasn't had much of a chance to touch
>> the hardware - about the only things are the decompressor and the kernel
>> touching the early console.  As they seem to be working, it suggests
>> that's not the cause.
>>
>> It seems to be pointing towards something in the boot loader...
>>
>> Normally, uboot will hook itself into the vectors to report errors, but
>> I wonder whether uboot enables asynchronous aborts while it's running.
>> Don't forget to make sure that the aborts are disabled again prior to
>> calling the kernel.
>>
>
> Another possible cause: trustzone software.
>
> we root caused such kind of asynchronous external abort on Marvell Berlin SoCs
> to a trustzone bug. I'm not sure whether keystone linux is running at normal
> world or not.
Yes, in normal world (Non secure supervisor)
>


-- 
Murali Karicheri
Linux Kernel, Keystone
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