> Well, the ps7500fe is highly integrated, but going through cirrus' pdf
>on it i can't find any mention of a hardware watchdog.
No, the '7500 doesn't have one.
> There's also a small ASIC (well, Lattice calls it something else but it
>sure sounds like an ASIC to me),
If this is a PLD (or indeed an ASIC) it could do almost anything, including the
watchdog function. If you can find the reset signal on the CPU it should be
possible to determine what other devices are connected to the same trace,
assuming there aren't any in BGA packages or the like.
>investment in a watchdog is, so, I'm not sure what to look for. I mean,
>if I started cataloging ICs and found one that phillips identifies as a
>watchdog, sure, but, that sounds so unlikely it's silly.
Well, people like Maxim do make chips which do precisely that; they handle
power-on reset, watchdog, and brownout protection.
> I suppose we could try something drastic like severing the reset pin on
>the cpu. Real hacking starts with an x-acto knife, yaknow ;-)
Unfortunately that would probably stop it starting up at all. :-) But if the
watchdog is a discrete part, you may be able to sever something that will
de-fang it.
p.
_______________________________________________
http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm
