【ARM Coresight OpenOCD 系列 5 -- arp_examine 使用介绍】

OpenOCD arp_examine 使用

因为我们很多时候运行 Openocd 的时候有些 core 还没有启动, 所以最好在配置脚本中添加 -defer-examine这个参数, 如下：

#cortex-m33
target create ${_CHIPNAME}.m33 cortex_m -dap ${_CHIPNAME}.dap -ap-num 0x6B240000 -dbgbase 0xE000E000 -defer-examine

添加完之后，在启动Openocd之后：

> Connection closed by foreign host.
zhugong@:~/workbase/openocd/$ telnet 127.0.0.1 8888
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
Open On-Chip Debugger
> targetsTargetName         Type       Endian TapName            State
--  ------------------ ---------- ------ ------------------ ------------0  debug.a53.0        aarch64    little debug.cpu          examine deferred1  debug.a53.1        aarch64    little debug.cpu          examine deferred2  debug.a53.2        aarch64    little debug.cpu          examine deferred3  debug.a53.3        aarch64    little debug.cpu          examine deferred4  debug.a78.0        aarch64    little debug.cpu          examine deferred5  debug.a78.1        aarch64    little debug.cpu          examine deferred6  debug.a78.2        aarch64    little debug.cpu          examine deferred7  debug.a78.3        aarch64    little debug.cpu          examine deferred8  debug.m33          cortex_m   little debug.cpu          examine deferred9  debug.m33_ahb      mem_ap     little debug.cpu          running

在使用某个AP的时候需要先手动做arp_examine，否则会报错Target not examined yet，如下图所示：

> targets debug.axi
> mdw 0x88000000 4
Target not examined yet

添加过 -defer-examine参数之后可以使用下面类似的命令 enable 这个AP：

> debug.axi arp_examine
> debug.axi mdw 0x80000000 4
0x80000000: 00000000 00000000 00000000 00000000