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   Single Stage to Orbit  wrote:   
   > So that's the difference, thanks for the info, much appreciated. To sum   
   > up SWD on the Raspberry Pi probe only good enough for rp2040s and   
   > others with SWD.   
   >   
   > What do you suggest I use on raspberrypi instead? It is indeed the boot   
   > process I need to debug. It is working OK in Qemu 9.x but does not boot   
   > on real rpi hardware, either rpi3 and rpi4.   
      
   I'd maybe try a second RPi running OpenOCD and the GPIO to drive the JTAG   
   pins on the first RPi:   
   https://forums.raspberrypi.com/viewtopic.php?t=336001   
      
   Theo   
      
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