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Boundary Scan on IMX7

Question asked by Pivk Luka on Oct 27, 2016
Latest reply on Nov 27, 2016 by Yuri Muhin

Hi All,

 

We are trying to do a boundary scan on IMX7D and IMX7S. As far as we can tell there are 2 modes for JTAG. 

 

Debug and Test mode. Our hardware is designed to pull JTAG_MOD pin always down so we go to Debug mode. 

 

Now if I pull that resistor up I can enter the boundary scan and do my tests. 

 

Issue is that pin JTAG_MOD is pulled down and as far as we can tell from reference manual we have to go trough DAP to be able to do boundary scan.

 

My 1st question is -> Is it even possible to do boundary scan this way? Or do we need to be in test mode to do it? 

 

If its possible do you have some hints on how to configure DAP to be able to do boundary scan. I do not want to rewrite all the software I currently have to do boundary scan so it would be nice if there is an easy way to do it while JTAG_MOD is pulled down.

 

Thanks.

Luka

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