How to enable JTAG for BPI-R3

Banana Pi Router design BPI-R3/R3 Mini(MT7986)
1

Hi,

I want to use the JTAG in BPI-R3. According to File:R3 gpio 40.jpg - Banana Pi Wiki, I connect the pin 19,21, 23, 24 and one GRD pin 25 to the JTAG tool. Do I need to connect other pins?Seems these pins are multi-purpose pins.We also need to set some other settings. @sinovoip, would you help? Thanks!

Tony

2

I’ve tested using TRACE32 and confirmed that only SWD is working on BPI-R3, and the normal JTAG does not work at all due to missing the nSRST and nTRST signals.

3

How do you confirm SWD works? Just get the SWD ID or you can use the trace32 control the CPU(stop/run)? Would you share the configuration commands or script? Thanks a lot.