I've just come across this conversation in my own search for a rock-solid, 
embeddable configuration for the BeagleBone Black.  I’m trying to develop 
an embedded controller device that needs to live behind walls, in ceilings 
and in other inaccessible places. ( It is for the automation of art & other 
electronic installations.)

>From what I gather here, the BBB is not quite up to the task, without an 
external watchdog circuit (please correct me if I’m misreading this thread).

@John3909: Your suggestion of the GreenPak prompted my own discovery of 
that tech — it looks great, esp the ecosystem of tools around the platform. 

In looking around, I found some Silego application notes that implement a 
hardware watchdog for MCUs.  
http://www.silego.com/products/352/312/AN-1058.html  This might be a useful 
starting point for anyone using GreenPak for a hardware watchdog.

@John3909: Does this design look like it might be a good fit for the BBB? 
(Not knowing how to read GreenPak internals, it is not obvious to me)

Alternately, I'm wondering in the two years that have passed since this 
thread started, if anyone has developed a hardware watchdog design for the 
BBB they'd be willing to share.  An open-source hardware watchdog for the 
BBB would go a long way towards ameliorating the hardware issues with the 
PMIC on RevC, and allow it to prosper as a base for applications where 
long-term reliability matters.

Although I’m first and foremost a software engineer, I've got some 
electronics chops (albeit mostly digital), but (sadly) very limited 
hardware design equipment (oscilloscope, etc).  [That said, I have iron, 
and will solder!]  I’d be happy to develop & contribute the software 
components for such a system (I’d envision a library + device tree overlay) 
if someone(s) else would like to partner up to design the hardware side.

Best,

ST

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