#Raspi3 Raspi4 jtag debug
- Connect the JTAG to RPI
40-pin gpio connect
gpio22-27 Alternative Function Assignments all are ALT4.
connect following gpio pin to jlink pin.
| 管脚名字 | gpio功能ALT4 |
|---|---|
| GPIO22 | ARM_TRST |
| GPIO23 | ARM_RTCK |
| GPIO24 | ARM_TDO |
| GPIO25 | ARM_TCK |
| GPIO26 | ARM_TDI |
| GPIO27 | ARM_TMS |
| 3.3v | Vref |
| GPIO09 | GND |
- copy some files into SD card
- Copy the config.txt and loop.bin into SD boot partition.
- Insert the SD card to PI.
- Power on the PI.
Connect the JLINK to PC.
- Download the openocd. https://github.com/xpack-dev-tools/openocd-xpack/releases you can download the pre-build or download the source code build by youself.
注意：使用我们提供的Vmware image，内置了openocd，不需要额外下载。
-
run the openocd to connect the JLINK $ sudo openocd -f jlink.cfg -f raspi4.cfg or $ sudo ./openocd/0.10.0-13/bin/openocd -f jlink.cfg -f raspi4.cfg
-
Open another terminal. $ telnet localhost 4444
halt load_image /home/rlk/xxx/BenOS/arch/arm64/boot/benos.bin 0x80000 step 0x80000
- Open another terminal. $ gdb-multiarch --tui benos (gdb) target remote localhost:3333 (gdb) b print_el #set break point (gdb) s # step to debug