[maemo-developers] N810 Resets

[From: Eero Tamminen]

Hi,

ext Alex Iliadis wrote:
> Hi Eero,
> On Thursday 13 December 2007 10:16:09 am you wrote:
>> ext Alex Iliadis wrote:
>>> On Thursday 13 December 2007 02:25:58 am you wrote:
>>>> ext Alex Iliadis wrote:
>>> I scrolled a bit further down though and I noticed the following:
>>>
>>> Dec 13 09:36:20 Nokia-N810-42-18 kernel: [   18.531250] mmcblk0: rw=0,
>>> want=4013848, limit=3932160
>>> Dec 13 09:36:20 Nokia-N810-42-18 kernel: [   18.531250] Buffer I/O
>>> error on device mmcblk0p1, logical block 501728
>>> Dec 13 09:36:20 Nokia-N810-42-18 kernel: [   18.531250] attempt to
>>> access beyond end of device
>> Does the reboot happen if you remove the MMC?
>>
>> There was earlier some case where an application infinitely reading
>> corrupted MMC FAT file system could sometimes cause kernel panic, but
>> that should have been fixed for N810 & Chinook.
>>
>>
> I think it's an internal one bundled with the device. (I haven't connected 
> any in the slot) Not sure why it's displayed as mmc, but I'm guessing the 
> linux kernel identifies it as one? Maybe somehow it got corrupted and  
> that's what's causing the problems? I'll try to do a clean flash of the 
> system and re-run the application and let you know of the result.

Reflashing doesn't do anything to the MMCs (whether it's the N810
internal one of something that user can change).  You can format it
from the file manager or from Desktop after connecting the USB cable.

In Chinook the MMC is mounted as read-only if it's corrupted.
However if something in system is accessing it incessantly, it's
possible that this can cause some instability.


Btw. As everybody knows, the MicroSoft FAT file system used on
the memory cards wasn't designed to be robust.  If you unplug
the USB cable without "safely remove" step, remove MMC otherwise
when it's being written, take battery out when device is on or
device HW (not SW) watchdog reboots it, the MMC FAT filesystem
will get corrupted.  (These aren't a problem with the internal
JFFS2 filesystem)


	- Eero