环境：

硬件：PC机<------>ARM仿真器v8.00<------>已下载好bit流的Xinlinx SoC开发板（其上有arm cortex-a9核）

软件：Redhat Linux6（或虚拟机） + openocd

使用openocd下载程序，调试arm cortex-a9核。

一、openocd安装

1. 下载libusb库安装或直接yum install libusb*
2. 下载openocd-0.10.0.zip：https://sourceforge.net/projects/openocd/解压，进入目录
3. $ ./configure --prefix=/home/benben/openocd --enable-jlink
4. $ make 　　                                 #若编译有错根据提示信息修改
5. $ sudo make install

二、openocd使用

$ lsusb

能查到仿真器usb信息...

$ openocd -f em8302_jtag.cfg（其中引用了jlink.cfg与v7arm.cfg） #连接开发板

打印出一些无Error的信息...

$ telnet localhost 4444 #启动守护程序

> resume 0 #从0地址开始运行

> halt #暂停cpu

> mdw 0 12 #从0地址读12个数（32位）

>mww 地址 写的数 #向某地址写数（32位）

>reg #查看寄存器

em8302_jtag.cfg内容

# The 8301 Board use jlink to Debug

source [find interface/jlink.cfg]

transport select jtag

# THe 8301 Board use a single v7arm chip

source [find target/v7arm.cfg]

echo "8302 Board Loaded."

# Set reset type and may be changed in some particular cases

reset_config trst_only

#reset_config separate

#reset_config trst_open_drain srst_open_drain

adapter_khz 200

# Wait after deasserting nTRST before starting new JTAG operations

#jtag_ntrst_delay 200

jlink.cfg内容（指定类型为jlink）

#

# Segger J-Link

#

# http://www.segger.com/jlink.html

#

interface jlink

# The serial number can be used to select a specific interface in case more than one

# is connected to the host.

#

# Segger software omits leading zeros in serial number displays,

# OpenOCD requires them.

#

# Example: Select J-Link with serial 123456789

#

# jlink serial 000123456789

v7arm.cfg（指定cpu信息）

if { [info exists CHIPNAME] } {

set _CHIPNAME $CHIPNAME

} else {

set _CHIPNAME ecictv7

}

# CoreSight Debug Access Port

if { [info exists DAP_TAPID] } {

set _DAP_TAPID $DAP_TAPID

} else {

set _DAP_TAPID 0x4ba00477

}

jtag newtap $_CHIPNAME dap -irlen 4 -ircapture 0x01 -irmask 0x0f \

-expected-id $_DAP_TAPID

#

# Cortex A9 target

#

# GDB target: Cortex-A9, using DAP, configuring only one core

# Base addresses of cores:

# core 0  -  0x1fffc000

# core 1  -  0x2fffc000

set _TARGETNAME1 $_CHIPNAME.cpu.0

set _TARGETNAME2 $_CHIPNAME.cpu.1

# A9 core 0

target create $_TARGETNAME1 cortex_a -chain-position $_CHIPNAME.dap \

-coreid 0 -dbgbase 0x80090000

# -coreid 0 -dbgbase 0xc0000000

#$_TARGETNAME1 configure -work-area-phys 0x80000000 -work-area-size 8096

$_TARGETNAME1 configure -event reset-start { adapter_khz 50 }

#$_TARGETNAME1 configure -event reset-assert-post "cycv_dbginit $_TARGETNAME1"

$_TARGETNAME1 configure -event gdb-attach { halt }

#smp mode cannot halt only one cpu core, have no idea, by yzq

# A9 core 1

#target create $_TARGETNAME2 cortex_a -chain-position $_CHIPNAME.dap \

#        -coreid 1 -dbgbase 0xc0002000

#$_TARGETNAME2 configure -event reset-start { adapter_khz 1000 }

#$_TARGETNAME2 configure -event reset-assert-post "cycv_dbginit $_TARGETNAME2"

#$_TARGETNAME2 configure -event gdb-attach { halt }

#target smp $_CHIPNAME.cpu.1 $_CHIPNAME.cpu.0

proc cycv_dbginit {target} {

# General Cortex A8/A9 debug initialisation

cortex_a dbginit

}