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不小心RG100-AA成砖了，先尝试用TTL修复吧，不行再使用JTAG，USB-TTL PL-2303_HX_数据线驱动。

黑=GND
白=RXD
灰=TXD

RG100-AA TTL连接图，从左到右依次为：VCC-GND-RXD-TXD

securecrt参数设置：

以下开始刷机，按住路由reset键，然后开启路由电源，10秒左右松开reset键，进入CFE界面，输入e a回车清除flash信息，CFE登录账号和密码：

#https://www.haiyun.me
用户：telecomadmin 密码：telecomadmin
用户：telecomadmin 密码：nE7jA%5m　
帐号：admin　      密码：8mCnC@bj　
帐号：bjcnchgw     密码：8mCnC@bj

清除信息后会重新启动进入CFE界面，将网络插入LAN4接口，通过浏览器打开192.168.1.1进入WEB升级界面，密码同上，上传OpenWRT固件刷机即可。
整个步骤securecrt显示如下：

Initializing Arena.
Initializing Devices.
Parallel flash device: name AM29LV320MT|S29GL128-A, id 0x2201, size 16384KB
Flash Layout: Boot[0,0xbe000000] Kern[1,0xbe020000]
              AuxFS[93,0xbeba0000] Misc[125,0xbefa0000] PSI[127,0xbefe0000]
Flash RootFS Partition Length: 12058624
CPU type 0x2A010: 300MHz, Bus: 133MHz, Ref: 64MHz
CPU running TP0
Total memory: 67108864 bytes (64MB)

Total memory used by CFE:  0x80401000 - 0x80529850 (1214544)
Initialized Data:          0x8041E730 - 0x80421050 (10528)


** Flash image not found. **


*** Break into CFE console ***

Board IP address                  : 192.168.1.1:ffffff00  
Host IP address                   : 192.168.1.100  
Gateway IP address                :   
Run from flash/host (f/h)         : f  
Default host run file name        : vmlinux  
Default host flash file name      : bcm963xx_fs_kernel  
Boot delay (0-9 seconds)          : 1  
Board Id (0-8)                    : 96358VW2  
Number of MAC Addresses (1-32)    : 11  
Base MAC Address                  : 00:1f:a3:65:55:8c  
PSI Size (1-64) KBytes            : 24  
Flash Block Size (1-128) in KBytes: 128  
Auxillary File System Size Percent: 25  
Main Thread Number [0|1]          : 0  

udp_send finished
No answer .auto boot ...
CFE> e a
Pleas longin:
user:telecomadmin
passwd:*************
login success
CFE> e a
Erase all flash (except bootrom)? (y/n):y
No image tag found.  Erase the blocks start at [1]
...............................................................................................................................

Resetting board...Boot Address 0xbe000000

Initializing Arena.
Initializing Devices.
Parallel flash device: name AM29LV320MT|S29GL128-A, id 0x2201, size 16384KB
Flash Layout: Boot[0,0xbe000000] Kern[1,0xbe020000]
              AuxFS[93,0xbeba0000] Misc[125,0xbefa0000] PSI[127,0xbefe0000]
Flash RootFS Partition Length: 12058624
CPU type 0x2A010: 300MHz, Bus: 133MHz, Ref: 64MHz
CPU running TP0
Total memory: 67108864 bytes (64MB)

Total memory used by CFE:  0x80401000 - 0x80529850 (1214544)
Initialized Data:          0x8041E730 - 0x80421050 (10528)


** Flash image not found. **

Board IP address                  : 192.168.1.1:ffffff00  
Host IP address                   : 192.168.1.100  
Gateway IP address                :   
Run from flash/host (f/h)         : f  
Default host run file name        : vmlinux  
Default host flash file name      : bcm963xx_fs_kernel  
Boot delay (0-9 seconds)          : 1  
Board Id (0-8)                    : 96358VW2  
Number of MAC Addresses (1-32)    : 11  
Base MAC Address                  : 00:1f:a3:65:55:8c  
PSI Size (1-64) KBytes            : 24  
Flash Block Size (1-128) in KBytes: 128  
Auxillary File System Size Percent: 25  
Main Thread Number [0|1]          : 0  

udp_send finished
No answer .auto boot ...
web info: Upload 3801092 bytes, Broadcom image format.
CFE> 
Flashing root file system and kernel at 0xbe020000: ..............................

.
*** Image flash done *** !

Resetting board...Boot Address 0xbe000000

2015.02.09更新：
Windows8.1已自带TTL数据线驱动，插入后通过设备管理器查看COM接口：

然后点击查看属性，后面使用xshell或securecrt要用到：

使用xshell新建会话，速率和上面的不一样：

然后连接：

Connecting to COM3...
Connected.

后面直接开机和进入CFE会显示启动界面，可用于进入CFE刷机或SSH不能连接Openwrt路由时使用。