From: theom+news@chiark.greenend.org.uk   
      
   Single Stage to Orbit  wrote:   
   > Does anyone knows how to use the Raspberry Debug Probe with a Raspberry   
   > Pi 3B? I've googled but the articles I've found only explains how to   
   > use it with Raspberry Picos. I have a tricky issue to diagnose and it   
   > needs hardware level debugging to see what's going wrong with it.   
      
   What do you want to debug?  The regular Pis have JTAG to which you can hook   
   up a debug probe and run something like OpenOCD+gdb on another machine (you   
   can likely do that from another Pi using GPIO, or a USB JTAG widget).  But   
   you're debugging the whole OS including all the daemons and whatnot that are   
   running on it.  Unless your issue is with the kernel itself (eg a boot   
   failure) or with some code running bare-metal, I don't think JTAG is going   
   to help much.   
      
   The Pico's Debug Probe provides SWD, which is for microcontrollers but not   
   for application-cores on the big Pis.  It provides 2 signal wires where JTAG   
   needs 4, so I don't think you could repurpose it for JTAG even if you wanted   
   to.   
      
   Theo   
      
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