--- In "naturalwatt" <> wrote:
>
> We have some dozens of units out in the field now, and sometimes some of them
> lock up, and have to be power cycled. Some sites never freeze, other do so
> annoyingly often.
>
> I am using a watchdog program that uses the TX watchdog, and although the
> watchdog program seems to work, it does not prevent these lockups that
> require power cycling. When I say the watchdog program works, if I kill
> -STOP it, the TS7250 reboots within about 5 seconds.
>
> I suspect mains spikes are the cause, but I would welcome thoughts and
> suggestions.
>
> When a system locks up it does not respond to ping or telnet or ssh or ftp.
>
> Martin
>
Hi Martin --
Just some random thoughts:
* There were some ep93xx errata regarding lockups in the ep93xx reset/poweron
sequence. Are all your chips the same rev level?
* Have you recorded any kernel oops / lockups in testing? Though that should
be the same for all boards ...
* Do the lockups seem to correlate by site? That is, can you swap a board that
never locks up with one that does, and see if the lockups follow the board or
the site?
* Are the power supplies all the same? You could try a big cap across the 5V
supply line, or go to a better grade regulated 5v supply at the problem sites.
If your analog skills are good (mine aren't), you could even come up with a
drop-out detector that would sit between the PS and the board, and latch an LED
if the 5V drops below a certain level.
regards, ........... Charlie
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