[E1000-devel] ARM support for igb driver

[ben.dooks@codethink.co.uk (Ben Dooks)]

On 03/06/14 16:23, Arnd Bergmann wrote:
> On Tuesday 03 June 2014 16:13:07 Ben Dooks wrote:
>> On 03/06/14 16:05, Arnd Bergmann wrote:
>>> On Tuesday 03 June 2014 15:49:13 Ben Dooks wrote:
>>>> On 05/05/14 22:20, Alexander Duyck wrote:
>>>>> On 05/05/2014 01:38 PM, Thomas Petazzoni wrote:
>>>>>
>>>>> Glad to hear that this is working on your ARM platform as expected.
>>>>>
>>>>> I believe the issue Shiv is having is due to a problem with the specific
>>>>> platform as the IGB device is reporting a Data Link Protocol error via
>>>>> AER and I believe this is what is causing his platform issues.  On
>>>>> enabling BME the device is likely signalling a Fatal Error message in
>>>>> response to the DLP error.  The original error he was seeing was:
>>>>>
>>>>> Unhandled fault: imprecise external abort (0x1406) at 0x00000000
>>>>
>>>> I should sort out making these errors non-fatal to the system, there's
>>>> not really much point in killing a process that may not have been the
>>>> initiator of the problem.
>>>
>>> We really shouldn't catch those errors system-wide, it belongs into
>>> the specific host bridge driver, but Shiv refuses to say which one that
>>> is, so we can't fix it.
>>
>> I am not sure what else we can do, either we either have to have a
>> default null handler, or log that they have happened.
>>
>> The whole issue with the "imprecise external" part is that you have
>> no idea what instruction (or core) caused the issue and IIRC there is
>> very little information about what actually sent the abort.
>>
>> I believe these are useful to report as they tend to show that some
>> part of the system has gone wrong. For example, we get them on the
>> rcar-h2 if the system tries to access a unit that has not been
>> properly clocked.
> 
> In my experience, any unit that can send such an abort also has
> a diagnotic register that you can look into to find out at least the
> unit that triggered it so you can disable it.

Not on the rcar-h2.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius