Debugging Raspberry Pi 4 through JTAG using JLink and OpenOCD

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Debugging Raspberry Pi 4 through JTAG using JLink and OpenOCD

Hardware environment:
  • One Raspberry Pi, this routine uses Raspberry Pi OS 64 bit system, and can be used on any other Raspberry Pi operating system
  • Host win10, install openocd and gdb (this routine includes openocd and gdb multiarch installed in mingw64, which can also be done on Linux)
  • One JLink ARM simulator with 8 DuPont cables
Enable Raspberry Pi JTAG pins

Edit config.txt in the root directory of the Raspberry Pi image and add enable_jtag_gpio=1

Raspberry Pi and JLink Connection

Install JLink driver (this step can be skipped under Linux)

It should be noted that OpenOCD does not use the original driver of JLink. It only treats JLink as a regular USB device, so it is necessary to use the zadig tool to reinstall the USB driver for JLink

Start openocd

Edit and save raspberry4.cfg

Start openocd

OpenOCD defaults to starting gdbserver service on port 3333 and telnet service on port 4444

Start GDB

Gdb multiarch, as the name suggests, is a gdb that supports multiple architectures

 

 

 

 

 

 

 

 

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