[Ovmsdev] OVMS v2 Memory/Settings Corruption

[Mark Webb-Johnson]

That really sounds like something writing to EEPROM (but confused and writing the wrong thing).

I see in vehicle_twizy.c there are a lot of par_write and par_set. Also some in vehicle_kiasoul.c.

Could it be a large number of writes either going through the write cycles of EEPROM, or perhaps showing up a bug in params.c par_write() function?

Regards, Mark

> On 25 Nov 2016, at 4:38 PM, Julien Banchet <jaxx at jaxx.org> wrote:
> 
> Oh ! This one is impressive
> Definitly not bit flip nor single caracter screw-up:
> My phone number became "Topping o"! (I was far from topping off, and the OVMS was plugged 15 minutes before charging the Twizy)
> 
> Screenshot this morning
> https://goo.gl/photos/6Yv9TUTTHmQTLosT8 <https://goo.gl/photos/6Yv9TUTTHmQTLosT8>
> 
> JaXX./.
> 
> 
> On Fri, Nov 25, 2016 at 8:16 AM, Julien Banchet <jaxx at jaxx.org <mailto:jaxx at jaxx.org>> wrote:
> Sorry, I only gave flaky examples because I switched phones recently and was lazy to digup the old one that had some screenshots
> 
> Here are some real cases
> C33651886877
> +336518867s7
> +3365188T877
> +336518868h7
> 
> That said, it still is way more than a simple bit flip, and only corrupts the phone number as far as I can recall.
> 
> I have no explanation, all I can say is, most of the time, I plug the OVMS when I plan charging later in the morning, usually when I'm still underground and a handful of seconds before putting contact (if this can point to any clue)
> 
> Anyways, gonna try cutting GPRS this morning and see how quick it discharges and might automate switching SMS<->SMSIP once in a while to keep an eye on the battery (my cell operator has an API) though it might wearout eeprom even more :-/
> 
> JaXX./.
> 
> 
> On Fri, Nov 25, 2016 at 1:56 AM, Mark Webb-Johnson <mark at webb-johnson.net <mailto:mark at webb-johnson.net>> wrote:
> $ perl -e 'printf "%08b\n",ord("5");'
> 00110101
> $ perl -e 'printf "%08b\n",ord("k");'
> 01101011
> $ perl -e 'printf "%08b\n",ord("8");'
> 00111000
> $ perl -e 'printf "%08b\n",ord("Z");'
> 01011010
> 
> Strange. Seems more than a simple bit flip. I haven’t seen this myself, or heard of it much from other users.
> 
> 
> 
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