Re: Centrino Advanced-N 6235 - Microcode SW error detected

["Pali Rohár" <pali.rohar@gmail.com>]

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On Monday 12 February 2018 20:48:47 Luca Coelho wrote:
> On Tue, 2018-01-30 at 20:49 +0100, Pali Rohár wrote:
> > Hello,
> 
> Hi Pali,
> 
> 
> > for almost 3 years I have a problem with Intel wifi card Centrino
> > Advanced-N 6235. Its firmware periodically crash and in dmesg I'm
> > seeing
> > a message "Microcode SW error detected".
> > 
> > Problem happens independently of kernel versions (I tried 3.8, 3.13,
> > 3.18, 4.0, 4.9). Currently I'm using Debian Stretch and its 4.9
> > version.
> > 
> > This wifi card is identified as:
> > 
> > $ lspci -s 03:00.0 -vv
> > 03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 24)
> >         Subsystem: Intel Corporation Centrino Advanced-N 6235 AGN
> 
> [...]
> 
> > And here is example of dmesg error flood:
> > 
> > [26624.998823] iwlwifi 0000:03:00.0: Microcode SW error detected.  Restarting 0x2000000.
> 
> [...]
> 
> > [26624.999013] iwlwifi 0000:03:00.0: Loaded firmware version: 18.168.6.1
> > [26624.999117] iwlwifi 0000:03:00.0: Start IWL Error Log Dump:
> > [26624.999118] iwlwifi 0000:03:00.0: Status: 0x000002CC, count: 6
> > [26624.999120] iwlwifi 0000:03:00.0: 0x000028AA | ADVANCED_SYSASSERT          
> > [27464.823779] iwlwifi 0000:03:00.0: Loaded firmware version: 18.168.6.1
> > [27464.823903] iwlwifi 0000:03:00.0: Start IWL Error Log Dump:
> > [27464.823904] iwlwifi 0000:03:00.0: Status: 0x000002CC, count: 6
> > [27464.823906] iwlwifi 0000:03:00.0: 0x000028AA | ADVANCED_SYSASSERT          
> 
> [...]
> 
> > This really looks like firmware problem. What can I do with these
> > microcode errors? Can you help me?
> 
> Yes, this is a firmware problem.  But unfortunately this is a really
> old hardware (6 years old) and we don't support the firmware anymore. 

Hi! That is pity :-(

> I'm sorry, but there is really nothing we can do.

So can I debug this problem myself? Is there any documentation or
resources for this?

> I hope the driver manages to recover properly and WiFi continues to
> work on your machine without much disturbance when this happens.
> 
> --
> Cheers,
> Luca.

-- 
Pali Rohár
pali.rohar@gmail.com

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