[MinnowBoard] MinnowBoard Turbot Watchdog

[Mike Winter (Work)]

Hi B-O

Thanks for looking at this. I have just looked up the E3800, and found a brief mention in the datasheet about the Watchdog. So it does look like the Minnowboard will have a Watchdog. I will need to investigate this (at a later date). First to get Windows IoT working...

Thanks again for the information

Mike

-----Original Message-----
From: Berth-Olof Bergman [mailto:bo.bergman at winzenttech.com] 
Sent: 12 April 2016 10:59
To: MinnowBoard Development and Community Discussion <elinux-minnowboard at lists.elinux.org>
Subject: Re: [MinnowBoard] MinnowBoard Turbot Watchdog

Hi all,

Why don’t use the built in watchdog present in all E3800 series chips? The watchdog is located in the TCO logic.

Regards,

B-O

> 12 apr. 2016 kl. 11:30 skrev Mike Winter (Work) <mike.winter at miwin.co.uk>:
> 
> Hi Eric
> 
> How have you implemented a software Watchdog? What happens if your WD 
> software hangs?
> 
> Not that I have a lot of experience, but quite a few, if not all of 
> the boards that I have come across for embedded purposes have a watchdog :
> Beagleboard (http://beaglebone.cameon.net/home/watchdog-timer)
> RPi
> (http://blog.ricardoarturocabral.com/2013/01/auto-reboot-hung-raspberr
> y-pi-u
> sing-on.html)
> The PC that I am looking to replace with the Minnowboard is a DMP eBox 
> - In the manual, it tells you about the watchdog :
> ftp://ftp.dmp.com.tw/DMP_Vortex86_Series_Software_Programming_Referenc
> e_0912
> 16.pdf
> 
> I just tried googling the processor used in the Turbot, and the first 
> one that came up was this (which includes a WD):
> http://www.portwell.com/pdf/catalog/Intel_Bay_Trail_E3800.pdf
> 
> From Wiki : "Watchdog timers are commonly found in embedded systems 
> and other computer-controlled equipment where humans cannot easily 
> access the equipment or would be unable to react to faults in a timely 
> manner. In such systems, the computer cannot depend on a human to 
> reboot it if it hangs; it must be self-reliant"
> 
> I may be wrong (frequently am!), but I think that the way these WD 
> work, is by software enabling the Hardware WD, which has a timer (also 
> initiated by s\w). The timer starts to count down, and if it gets to 
> 0, will perform a hardware reset - same as physically turning the power off & then on again.
> The software's 'job' is to make sure the timer never gets to 0, so 
> should frequently set the timer back to your specified WD interval.
> 
> What I normally do is set the WD timeout period to 3 seconds, and then 
> in my s\w initialize the WD every second. This allows you to miss a 
> cycle by accident, without the PC rebooting.
> 
> Regards
> 
> Mike
> 
> 
> 
> -----Original Message-----
> From: Eric [mailto:ericolv at cox.net]
> Sent: 08 April 2016 20:39
> To: 'MinnowBoard Development and Community Discussion'
> <elinux-minnowboard at lists.elinux.org>
> Subject: Re: [MinnowBoard] MinnowBoard Turbot Watchdog
> 
> I've not heard of any PC motherboard or embedded board with a feature like
> this.   However, I have implemented this type of functionality in software.
> 
> -----Original Message-----
> From: elinux-MinnowBoard
> [mailto:elinux-minnowboard-bounces at lists.elinux.org] On Behalf Of Mike 
> Winter (Work)
> Sent: Friday, April 8, 2016 7:02 AM
> To: 'MinnowBoard Development and Community Discussion'
> Subject: Re: [MinnowBoard] MinnowBoard Turbot Watchdog
> 
> Hi John, thanks for the reply.
> 
> I am looking at using the Minnowboard in an embedded environment. 
> Other PCs that I have used have a hardware Watchdog, which, when 
> turned on, you are required to poll at definable intervals. If you do 
> not poll it quickly enough (or stop polling, due to hung software), 
> the PC will perform a hard reset. Is this a feature of the 
> Minnowboard, or likely to be incorporated in future versions?
> 
> Thanks again for your help
> 
> Mike
> 
> -----Original Message-----
> From: John Hawley [mailto:john.hawley at intel.com]
> Sent: 08 April 2016 06:09
> To: elinux-minnowboard at lists.elinux.org
> Subject: Re: [MinnowBoard] MinnowBoard Turbot Watchdog
> 
> What kind of watchdog are you looking for / need?  Just trying to 
> figure out what kind of watchdog you are looking for.
> 
> - John 'Warthog9' Hawley
> 
> On 4/7/2016 3:25 AM, Mike Winter (Work) wrote:
>> I have a MinnowBoard Turbot on the way, but when I ordered I forgot 
>> to check whether there is a watchdog, which is a requirement for my 
>> project. Is there one in the Turbot, I haven't found any mention of one?
>> 
>> 
>> 
>> Regards
>> 
>> *Mike Winter*
>> 
>> 
>> 
>> 
>> 
>> _______________________________________________
>> elinux-MinnowBoard mailing list
>> elinux-MinnowBoard at lists.elinux.org
>> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
>> 
> _______________________________________________
> elinux-MinnowBoard mailing list
> elinux-MinnowBoard at lists.elinux.org
> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
> 
> _______________________________________________
> elinux-MinnowBoard mailing list
> elinux-MinnowBoard at lists.elinux.org
> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
> 
> _______________________________________________
> elinux-MinnowBoard mailing list
> elinux-MinnowBoard at lists.elinux.org
> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
> 
> _______________________________________________
> elinux-MinnowBoard mailing list
> elinux-MinnowBoard at lists.elinux.org
> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard

_______________________________________________
elinux-MinnowBoard mailing list
elinux-MinnowBoard at lists.elinux.org
http://lists.elinux.org/mailman/listinfo/elinux-minnowboard