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Raspi3 Raspi4 jtag debug

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
GPIO01 Vref
GPIO09 GND

Download pre-built OpenOCD for Windows

https://gnutoolchains.com/arm-eabi/openocd/