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unable to connect DStream JTAG to imx6ulevk

Question asked by Mark Bohanon on Sep 14, 2016
Latest reply on Sep 24, 2016 by igorpadykov


I am attempting to debug a linux application on my imx6ul evk.  I am having some difficulties connecting my DStream JTAG to NXP i.MX6UL EVK.   The EVK is connected to Ethernet, usb, and JTAG.  DSteam connected to Ethernet.  I’m using DS-5 ultimate.


With DSteam not connected, I can connect to EVK and debug using gdb.


If I reset EVK, wait for it to fully boot up, then try to connect using DStream (Bare Metal or Linux), I get:

                Unable to connect to (DStream)

                Unable to connect to device AHB_0

                No Connection to target.


If I connect using DStream and DS-5 debugger right after restart, then I am able to connect.  However, kenel loading process freezes and I can’t do anything.  I do have a JTAG connection, I can get trace data, registers, etc.  The boot process does not complete. 


On the putty terminal, it stops after “snvs-secvio 20cc000.caam-snvs: can’t get snvs clock”.  BTW, I get this line when I do not have JTAG connected, and everything is normal.


The Remote Systems Explorer no longer works.


The Debug LED on the DStream flashes rapidly.  The LED on the EVK Ethernet port flashes rapidly as well.