Set hardware breakpoint instruction for ejtag under the PMON of the Godson development board

EJTAG yes mips Of onchip debug Commissioning standard , Its full name is Enhanced Joint Test Action Group, yes MIPS The company is based on IEEE

1149.1 The basic structure and function extension of the protocol , It's a hardware / Software subsystem , In the processor, a system based on

Hardware debugging features , Used to support on-chip debugging . Current Godson 1 Number 、 Godson 2 Number ( Godson 2F And previous versions do not support ) Helong core 3 Number system

All columns support ejtag debugging .

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Ejtag Can be in windows and linux Used in two environments , stay  linux  There is no need to install the driver in the environment , As we are 6.1

Used in the chapter Ejtag burning pmon Mirror image , The driver is not installed , Directly to root User rights open ejtag_debug_usb Software can make

use . So here we will focus on how to windows Lower installation Ejtag The driver .

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Based on xunweilongxin 2K1000 Development board ：

Set the hardware breakpoint instruction to  hb, View the breakpoint instruction as  hbls, The instruction to delete breakpoints is  unhb, The command format is as follows ：

Set breakpoint to addr: hb addr

View breakpoints ：hbls addr

Delete breakpoints ：unhb addr

give an example , Set breakpoint to 0xffffffffbfc000da, And see if it was successful , Then delete the breakpoint , And check whether the deletion is successful , as follows

As shown in the figure ：

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