[Letux-kernel] U-Boot Watchdog?

[H. Nikolaus Schaller]

> Am 17.03.2017 um 22:55 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> 
> Hi,
> 
>> Am 17.03.2017 um 22:45 schrieb Belisko Marek <marek.belisko at gmail.com>:
>> 
>> Hi Nikolaus,
>> 
>> 
>> On Fri, Mar 17, 2017 at 8:18 PM, H. Nikolaus Schaller <hns at goldelico.com> wrote:
>>> Hi,
>>> I have one strange problem on one of my GTA04A4 devices.
>>> 
>>> I can boot from NAND or MMC and break into U-Boot.
>>> 
>>> But after ca. 5-10 seconds the boards simply reboots.
>>> It is quite reproducible and looks like a watchdog
>>> timer...
>> watchdog timeout is set to 60secs so it's unlikely it's reboot by
>> watchdog (drivers/watchdog/omap_wdt.c)
> 
> It is just sufficient time to break into the U-Boot console
> and start typing.
> 
> Or approx. the same time booting into Linux.
> 
> So it is more a 10 second "timeout" triggered by U-Boot having initialized :)
> 
>> it's reproducible 100% only on one board? thanks.
> 
> Yes. I have never seen that on any other board. Even when swapping the
> boot-SD card to others.
> 
> Maybe something in the twl4030 is broken?
> 
> What I have not tried to find out is if power consumption raises. Or
> if the charging circuits are damaged. That might decrease system voltage
> below the auto-power-off. But then it should no start over.
> 
> And, I should try to find out if the delay until reboot is always the
> same.

It appears to be always 7-8 seconds after inserting battery. Independent
of using the AUX button for the U-Boot Menu. Or using a different battery.

The only small difference is when booting from SD-Card. Then it is 9 seconds.

It also doesn't matter if NAND is flashed :(

> 
>>> 
>>> It is the first time in 6 years I have seen this...
>>> 
>>> And: it is exactly the same SD card I had used to reflash
>>> and test two other boards before.
>>> 
>>> Any ideas?
>>> 
>>> BR,
>>> Nikolaus
>>> 
>>> _______________________________________________
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>> 
>> BR,
>> 
>> marek
> 
> BR and thanks,
> Nikolaus
> 
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