WHR-HP-G54使用JTAG不能识别CPU（问题解决了）

xunmi818

一个正常工作中的WHR-HP-G54已经焊好了JTAG插座，用一个原来在WRT54GS1.0上正常工作的JTAG线，使用EJTAG1.8、tjtagRC-3.0都不能识别CPU，何故？
1.图片是我的实物图，脚的定义没有问题吧？确认JTAG插座焊接没有问题，用万用表测量了3、5、7、9脚到打印口的2、13、4、3脚是通的，地线也通。1脚电压为3V，3、5、7、9脚的电压均为1.7V左右
2.CMOS中已经设置ECP\378
3.WHR-HP-G54是好的，现在上网用的就是它。

yy5409

是否JTAG的脚定义搞错或者giveio.sys有问题？还有就是JTAG插针没有焊接好！！！

xgg54321

很好识别。。呵呵，要不识别估计PCB有断线，检查一下。。

xunmi818

很好识别。。呵呵，要不识别估计PCB有断线，检查一下。。
xgg54321 发表于 2010-3-6 15:06

修正一下：
没有断线，我测量了，1脚电压为3V，3、5、7、9脚的电压均为1.7V左右

xgg54321

不是这样的，都是3伏？？

xunmi818

不是这样的，都是3伏？？
xgg54321 发表于 2010-3-6 16:57

修正一下：
再次仔细我测量，1脚电压为3V，3、5、7、9脚的电压均为1.7V左右

jacky_ye

LZ这个不是WHR-HP-G54吧，怎么看有点像whr-gs54？上个全图看看吧。如果是后者的话，JTAG是不一样的。

xunmi818

都来帮忙看看啦

xunmi818

看看我的实物图，应该没有错误吧

61888008

3、5、7、9脚的电压不对，应该都是 3-3.3V 左右，，，

maithon

要是3.3v 的话，也是tdo有，tdi 不会的，
试着调整线序。

xunmi818

要是3.3v 的话，也是tdo有，tdi 不会的，
试着调整线序。
maithon 发表于 2010-3-7 18:57

试着调整线序，不会吧？原厂的说明已经很清楚了，不会错的。

Buffalo WHR-HP-G54 JTAG

Lets say the instant you switch on your buffalo it displays all GREEN LEDs, the switch is all green, the green power
light is on but no other colours and nothing is blinking. Nothing changes and nothing you do has any effect, you
can't ping 192.168.1.1 nore 192.168.11.1 and you have tried shorting pin 12 as above. This is the time for JTAG
and the Hairy Dairy Maid utility! If you have heard of this then I expect you have been dieing to use it. JTAG is a
12 pin header on the board for which you will need to connect control 4 wires to your computers printer port (parallel) and 2 gound wires. JTAG allows the 'manual' operation of the boards circuits even if the CPU is well and trully crashed. A bit like brain surgery with the top of someones head removed. I did this on Windows 2000, it (and XP) does not like you messing with the parallel port so you need a special driver to allow this; giveio.sys. Without this nothing happens. You can get the program and instructions from here: Hairy Dairy Maid Now read those instructions and then read what I specifically had to do to get it working on our one.


solder the 25 way D on your JTAG cable follow the standard pinout.
solder the PCB end onto the JTAG header directly to the solder pads, evens are ground; 2+4+6+8=20+25, odds are signals; 3=2,5=13,7=4,9=3.
this is standard JTAG, nothing special, forget the resistors the PCB already has them.
to install the giveio.sys copy this file and loaddrv.exe into {windows}\system32\drivers
double click loaddrv.exe in the system32 dir. This is important.
append the filename giveio.sys onto the path in the utility
press the load button and the start button, they should both confirm success. If this does not happen go no further, go back and fix this.
from the command prompt cd to your Hairy Dairy directory and run wrt54g.exe to get a list of option
to check your cable, plugin and power up the buffalo and do wrt54g -backup:nvram /noemw /fc:29
it will detect the CPU type and you should see your data as FFFFFF and CFD1AFC nonsense whizz past. If not then check your cable.
finnaly to erase your NVRAM (the usual cause of the problem) wrt54g -erase:nvram /noemw /fc:29

lalfworld

试试EJTAG Debrick Utility v1.6r ，我以前刷WHR-HP-G54 就是用的这个
实在不识别就在命令后加 空格/fc:29

xunmi818

问题解决了，谢谢各位提供的各种建议。
换了一台电脑后一切正常，为什么和电脑有关系呢？

yy5409

请回看那台不能JTAG电脑里面的giveio.sys，看看其容量多大？