这段时间在用jlink调试freescale的mx51板子，下面将使用jlink的方法在此做一个笔记。
jlink是segger公司的产品，由于正版的工具巨贵，所以现在大部分人都喜欢用山寨版的jlink，幸运的是我的山寨版jlink支持arm cortex a8，所以能调试mx51板子。
jlink的官方提供调试软件和驱动，调试软件有jlink commander（j-tag调试）、j-mem（内存查看）、j-flash（flash烧写）等。我主要用到的是jlink commander，以下是它的命令集：
SEGGER J-Link Commander V4.20h ('?' for help)
Compiled Oct 5 2010 19:11:57
DLL version V4.20h, compiled Oct 5 2010 19:11:41
Firmware: J-Link ARM V8 compiled Oct 5 2010 08:59:59
Hardware: V8.00
S/N: 20100214
Feature(s): RDI,FlashDL,FlashBP,JFlash,GDBFull
VTarget = 3.280V
Info: TotalIRLen = ?, IRPrint = 0x..FFFFFFFFFFFFFFFFFFFFFFF1
WARNING: CPU core not found.
No devices found on JTAG chain. Trying to find device on SWD.
WARNING: CPU core not found.
****** Error: Parity error (Data = 0xFFFFFFFF, ReceivedParity = 1)
No device found on SWD.
Did not find any core.
Info: TotalIRLen = 9, IRPrint = 0x0011
Found 2 JTAG devices, Total IRLen = 5:
#0 Id: 0x2B900F0F, IRLen: 04, IRPrint: 0x0, ARM ETB
#1 Id: 0x07B76F0F, IRLen: 05, IRPrint: 0x1, ARM1176 Core
ARM11 identified.
J-Link>
Available commands are:
----------------------
f Firmware info
h halt
g go
Sleep Waits the given time (in milliseconds). Syntax: Sleep
s Single step the target chip
st Show hardware status
hwinfo Show hardware info
mem Read memory. Syntax: mem , (hex)
mem8 Read 8-bit items. Syntax: mem8 , (hex)
mem16 Read 16-bit items. Syntax: mem16 , (hex)
mem32 Read 32-bit items. Syntax: mem32 , (hex)
w1 Write 8-bit items. Syntax: w1 , (hex)
w2 Write 16-bit items. Syntax: w2 , (hex)
w4 Write 32-bit items. Syntax: w4 , (hex)
wm Write test words. Syntax: wm
is Identify length of scan chain select register
ms Measure length of scan chain. Syntax: ms
mr Measure RTCK react time. Syntax: mr
q Quit
qc Close JLink connection and quit
r Reset target (RESET)
rx Reset target (RESET). Syntax: rx
RSetType Set the current reset type. Syntax: RSetType
Regs Display contents of registers
wreg Write register. Syntax: wreg ,
SetBP Set breakpoint. Syntax: SetBP [A/T] [S/H]
SetWP Set Watchpoint. Syntax: [R/W] [ [] [A-Mask]]
ClrBP Clear breakpoint. Syntax: ClrBP
ClrWP Clear watchpoint. Syntax: ClrWP
VCatch Write vector catch. Syntax: VCatch
loadbin Load binary file into target memory.
Syntax: loadbin ,
savebin Saves target memory into binary file.
Syntax: savebin , ,
SetPC Set the PC to specified value. Syntax: SetPC
le Change to little endian mode
be Change to big endian mode
log Enables log to file. Syntax: log
unlock Unlocks a device. Syntax: unlock
Type unlock without to get a list
of supported device names.
nRESET has to be connected
---- CP15 ------------
rce Read CP15. Syntax: rce , , ,
wce Write CP15. Syntax: wce , , , ,
---- ICE -------------
Ice Show state of the embedded ice macrocell (ICE breaker)
ri Read Ice reg. Syntax: ri (hex)
wi Write Ice reg. Syntax: wi , (hex)
---- ETM -------------
etm Show ETM status
re Read ETM reg. Syntax: re
we Write ETM reg. Syntax: we , (hex)
es Start trace
---- ETB -------------
etb Show ETB status
rb Read ETB register. Syntax: rb
wb Write ETB register. Syntax: wb , (hex)
---- TRACE -----------
TAddBranch TRACE - Add branch instruction to trace buffer. Paras:,
TAddInst TRACE - Add (non-branch) instruction to trace buffer. Syntax:
TClear TRACE - Clear buffer
TSetSize TRACE - Set Size of trace buffer
TSetFormat TRACE - SetFormat
TSR TRACE - Show Regions (and analyze trace buffer)
TStart TRACE - Start
TStop TRACE - Stop
---- SWO -------------
SWOSpeed SWO - Show supported speeds
SWOStart SWO - Start
SWOStop SWO - Stop
SWOStat SWO - Display SWO status
SWORead SWO - Read and display SWO data
SWOShow SWO - Read and analyze SWO data
SWOFlush SWO - Flush data
---- File I/O --------
fwrite Write file to emulator
fread Read file from emulator
fshow Read and display file from emulator
fdelete Delete file on emulator
fsize Display size of file on emulator
---- Test ------------
thg Run go/halt 1000 times
ts Run step 1000 times
testwspeed Test download speed. Syntax: testwspeed [ []]
testrspeed Test upload speed. Syntax: testrspeed [ [] [<numblock< div="" style="word-wrap: break-word;">
s>]]
testcspeed Test CPU speed. Syntax: testcspeed []
---- JTAG ------------
Config Set number of IR/DR bits before ARM device.
Syntax: Config ,
speed Set JTAG speed. Syntax: speed |auto|adaptive, e.g. speed 2000,
speed a
i Read JTAG Id (Host CPU)
wjc Write JTAG command (IR). Syntax: wjc (hex)
wjd Write JTAG data (DR). Syntax: wjd (hex), (dec)
RTAP Reset TAP Controller using state machine (111110)
wjraw Write Raw JTAG data. Syntax: wjraw , ,
rt Reset TAP Controller (nTRST)
---- JTAG-Hardware ---
c00 Create clock with TDI = TMS = 0
c Clock
0 Clear TDI
1 Set TDI
t0 Clear TMS
t1 Set TMS
trst0 Clear TRST
trst1 Set TRST
r0 Clear RESET
r1 Set RESET
---- Connection ------
usb Connect to J-Link via USB. Syntax: usb , where port is 0..3
ip Connect to J-Link ARM Pro or J-Link TCP/IP Server via TCP/IP.
Syntax: ip
---- Configuration ---
si Select target interface. Syntax: si ,
where 0=JTAG and 1=SWD.
power Switch power supply for target. Syntax: power [perm],
where State is either On or Off. Example: power on perm
wconf Write configuration byte. Syntax: wconf ,
rconf Read configuration bytes. Syntax: rconf
usbaddr Assign usb address to the connected J-Link: Syntax: usbaddr =
ipaddr Show/Assign IP address and subnetmask of/to the connected J-Link.
gwaddr Show/Assign network gateway address of/to the connected J-Link.
dnsaddr Show/Assign network DNS server address of/to the connected J-Link.
conf Show configuration of the connected J-Link.
ecp Enable the J-Link control panel.
calibrate Calibrate the target current measurement.
----------------------
NOTE: Specifying a filename in command line
will start J-Link Commander in script mode.
总结一下我们使用的最多的命令：
usb--------连接目标板
r----------重启目标板
halt-------停止cpu运行的程序
loadbin----加载可执行的二进制文件
g----------跳到代码段地址执行 s----------单步执行（调试用） setpc-----设置pc寄存器的值（调试用） setbp-----设置断点
Regs-------读寄存器组织
wreg-------写寄存器
mem--------读内存
w4---------写内存
power off mmu---关闭mmu，这个对于裸板调试很重要 w4 cpsr,0x0000001f------切换到系统模式
speed------设置jtag的传输速率 rce 0,c0,c0,0-----设置cp15寄存器的第1个寄存器为0
完结。
Jlink Commander的使用例子：其中输入的地址和数据大小都是默认十进制来的，
windows 中
下载运行特制的程序对于S3C2410、S3C2440处理器，它们内部有4K的SRAM，当使用Nor Flash启动时，地址为0x40000000；当使用Nand Flash启动时，地址为0。对于S3C2410、S3C2440开发板，一般都外接64M的SDRAM。SDRAM能被使用之前，需要经过初始化。所以，先把一个init.bin下载到内部SRAM去运行，它执行SDRAM的初始化；然后再下载一个比较大的程序，比如u-boot到SDRAM去动行，它将实现对Nor、Nand Flash的操作。以下是在J-Link commander里的命令，假设init.bin、u-boot.bin在e:盘下。1. speed 12000 //设置TCK为12M，下载程序时会很快 2. 下载并运行init.bin，这是用来初始化SDRAM的
### 如果是NAND启动：
loadbin e:\init.bin 0
setpc 0
g
### 如果是Nor启动：
loadbin e:\init.bin 0x40000000
setpc 0x40000000
g
### 下载特制的uboot：
h
loadbin e:\u-boot.bin 0x33f80000
setpc 0x33f80000
g
现在，u-boot已经启动了，在串口工具上可以看到如图6所示界面，以后就可以通过网络、串口下载文件，然后使用u-boot里的命令进行烧写。
当然，如果没有网络，也不想忍受串口的速率，也可以通过jlink commander下载，比如：
h
loadbin your_file.bin 0x30000000
g
这时，你的文件已经被下载到SDRAM 0x30000000去了。
后面的操作就是u-boot的命令了。
###使用u-boot烧写Flash
以例子为例，假设需要烧写一个名为leds.bin的程序到Nor、Nand Flash，那么请参考
(1)．通过Jlink下载：
在J-Link commander里执行：
h
loadbin e:\leds.bin 0x30000000
g
注意leds.bin的大小
(2)．通过u-boot烧写到Nor Flash：
在u-boot里执行：
protect off all // 解锁
erase 0 2ffff // 擦除从0地址开始的大小为0x30000的NOR Flash扇区(大小为可擦除块的整数倍，可以运行flash info命令查看)
cp.b 0x30000000 0 30000 // 把前面下载到0x30000000的程序烧写到NOR去
(3)．通过u-boot烧写到Nand Flash：
在u-boot里执行：
nand erase 0 30000 // 擦除从0地址开始的大小为0x30000的Nnad Flash扇区
nand write.jffs2 30000000 0 30000 // 把前面下载到0x30000000的程序烧写到Nand去
注意，上面用的2ffff、30000等数字是192K，如果你的程序比较小，请自行设置
ubuntu中使用JLinkExe
J-Link>device arm9 (arm9是必须要加的，否则J-link会识别不出设备内核会报错)
Disconnecting from J-Link...O.K.
Device "ARM9" selected.
TotalIRLen = 4, IRPrint = 0x01
CP15.0.0: 0x41129200: ARM, Architecure 4T
CP15.0.1: 0x0D172172: ICache: 16kB (64*8*32), DCache: 16kB (64*8*32)
Cache type: Separate, Write-back, Format A
Found 1 JTAG device, Total IRLen = 4:
#0 Id: 0x0032409D, IRLen: 04, IRPrint: 0x1, ARM9 Core
ARM9 identified.
J-Link>loadbin /mnt/hgfs/ShareFolder/leds.bin 40000000
Halting CPU for downloading file.
Downloading file [/mnt/hgfs/ShareFolder/leds.bin]...
O.K.
J-Link>setpc 40000000（等效于0x40000000）
J-Link>g
J-Link>JFlash的使用
windows中用命令行cmd的方式 使用JFlash来给开发板烧写程序
"D:\Program Files (x86)\SEGGER\JLink_V512f\JFlash.exe" -openprjG:\s3c2440.jflash -openG:\leds.bin,0 -auto -startapp -exit
注意1：cmd中对路径中包含空格的不能识别
D:\>D:\Program/ Files/ /(x86/)\SEGGER\JLink_V512f\JFlash.exe
'D:\Program/' 不是内部或外部命令，也不是可运行的程序
或批处理文件。
解决办法：如上所示，将包含空格路径的用“”包含起来即可。
注意2：JFlash.exe 使用-openprj"*.jflash的工程路径" -open"*.bin的二进制程序路径",0(烧写的起始地址) 选项来指定烧写参数。-openprj与后面的路径不能有空格，-open与后面的路径不能有空格，逗号“，”前后不能有空格，否则烧写不成功。
可以写成一个批处理 内容和上面输入的内容一样
