UrJTAG - old software, not suggested for dd-wrt recovery. ZJtag - Newer, supports a short list of devices HairyDairyMaid Debrick Utility - Old, should only be used on WRT54G devices. This is also located on the dd-wrt website here
EJTAG TINY ICE DRIVER ARCHIVE
There are severalĪn archive of the original Jtag program used as the basis of tjtag original NOTE: As of this site is offline, it appears to have expired in June of 2017. With that understanding, we can now turn to the tjtag program So if you have followed the bouncing ball, you should now understand that you should use JTAG primarily for two things: Although you CAN flash the kernel using JTAG, it takes a LONG time and flashing using a jtag cable is not completely reliable, so you can end up with problems. If the CFE is working, you can flash using TFTP.exe or an equivalent program. Again, if you have a CFE on the router, you don't need to flash the kernel with Jtag. This is what you flash when you flash dd-wrt. If you delete the nvram, and have a proper CFE and kernel on the router, the nvram will rebuild itself.
You can erase the nvram by doing a HARD reset of the router but sometimes the router will not respond. This is often where things get mucked up and is often the reason why people need to jtag their router. The nvram is the place where variable information is stored. This can be tricky in some cases, so don't delete the bootloader! If you delete it, you at least have to find another one that is for your make and model of router. That is why it is so important not to ever delete this without backing it up.
EJTAG TINY ICE DRIVER MAC
It has the MAC addresses embedded in it for your router, so each one is a little different. Every router has it's own particular CFE. So, when people talk about the CFE of the router, they are talking about the bootloader. Linksys also used a VXworks bootloader on some routers that has to be replaced with a CFE linux bootloader using a VXKiller program. The bootloader on a DD-wrt is a linux bootloader, known as a CFE. It normally cannot be accessed without a jtag cable or using some dangerous commands. The bootloader protected and comes with the router. They are written to, and stored on your routers RAM chip. These three parts together are known as the WHOLEFLASH. The firmware is composed of a bootloader, (that starts up the router's operating system), the NVRAM, (where information particular to your router are stored, like it's IP address and your ssid name) and the kernel which is the program that your router uses. In order to understand jtag, you need to understand the three parts of the program that runs inside your router (known as the router's firmware). You often need to solder a pin connector to your motherboard. These ports do not usually have the pins there to connect to, but are just holes in your router motherboard.
EJTAG TINY ICE DRIVER SERIAL
There are sometimes two similar ports on a router one is the jtag port and the other is a serial port. Jtag is done with a cable hooked from a computer 25 pin printer port ( USB might also be available) to an electrical connection on your router called a jtag port. Jtag is a program for fixing your router if it is in an otherwise unrecoverable state. The best option is to get a ExpressCard Parallel port adapter. USB Jtag is expensive, and doesn't appear to work consistently well. Laptops don't normally have parallel ports anymore, and if your laptop doesn't you would be hooped.
Using a TUMPA may be the most accessible way to use JTAG. Often this means that the jtag will work without many failures that can come from interference and noise.Ī good all around debricking device is a TUMPA (~$30 US): TIAO USB Multi-Protocol Adapter (JTAG, SPI, I2C, Serial) Jtag on a Laptop Computer There is no router requiring a buffered jtag cable but it makes it easier with one since cable length is not so critical and you get less interference. Here is a great buffered adapter at a reasonable price: JTAG should only be used as a last resort option, TFTP and Serial should be used first.Īlso, do not even try JTAG on Atheros it is not supported.Ī jtag cable can be bought off ebay, or made very inexpensively. Today JTAG is commonly known for a JTAG debug port in many embedded systems - and (home) routers, wireless access points are examples of embedded systems. (source wikipedia:Joint Test Action Group) This was later standardized as IEEE 1149.1 Standard Test Access Port and Boundary-Scan Architecture. Joint Test Action Group ( JTAG) was originally known for testing printed circuit boards.
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