[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

Hauke Mehrtens hauke at hauke-m.de
Tue Jul 30 16:54:04 EDT 2013

On 07/30/2013 03:36 PM, Will Deacon wrote:
> On Sat, Jul 27, 2013 at 08:49:16PM +0100, Arnd Bergmann wrote:
>> On Friday 26 July 2013, Will Deacon wrote:
>>>>> At least, we need a pretty good explanation of what exactly is causing
>>>>> these spurious aborts before we start ignoring them unconditionally like
>>>>> this. You're effectively masking an extremely serious error indicator with
>>>>> this change.
>>>> This fault occurs once every boot sometime early in the boot process,
>>>> but the actual time this happens varies randomly.
>>> Well that's interesting in itself. It sounds like we don't know *for sure*
>>> whether the abort is triggered by Linux. Since the abort is imprecise, the
>>> timing will vary.
>> It might be possible to find out the culprit if you just enter an endless loop
>> in the early kernel boot code. If you enter the loop before Linux does something
>> wrong, it won't crash, otherwise it will. After that, you could bisect the
>> boot process by moving the busy loop around.
>> If it even crashes at the point where Linux gets entered, it's a bug in the
>> boot loader.
> Can you give Arnd's suggestion a go please Hauke?


I just tried that, but it did not crash in the loop. :-(

Now, with 3.11-rc3 it crashed reproducible after Freeing unused kernel
memory, see this:

[    0.859198] Freeing unused kernel memory: 1124K (c0260000 - c0379000)
[    0.866298] Unhandled fault: imprecise external abort (0x1c06) at
[    0.873538] Kernel panic - not syncing: Attempted to kill init!

Do you have some more informations about this type of error?


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