Linksys WRT300N v2.0
From DD-WRT Wiki
THX to OpenWRT for parts of the instructions
IMPORTANT NOTE: All information below is PROOF-OF-CONCEPT and may not function on an actual router
DD-WRT is not officially supported for this router version!
Flashing the Linksys WRT300Nv2
 Installing Redboot
Be sure to have the latest firmware installed.
Reset the device to defaults.
Since the device has the Jungo loader installed by default we have to change it to Redboot to get DD-WRT up and running. But keep cool its easy to handle as you will see below.
You will need a lil .py script that will do the backup of the orig flash content and flash the new redboot. A backup of this script can be found here: Jungo-image.jpg (You will have to rename it to jungo-image.py!).
The 2nd thing that is needed is the Redboot itself. The latest version can be downloaded here: Redboot . You should verify what each MAC address for WAN/LAN/WIFI is, and write them down somewhere, before installing DD-WRT. The MAC address for the WAN should be on a sticker on the bottom, and the LAN is +1 hex.?????
From here it is partially taken from the OpenWRT Wiki:
Installation of RedBoot can be accomplished with the jungo-image.py script. The script uses the telnet interface into the router to accomplish it's task.
The standard password for the USR software is: admin/"leave emty". If that fails set it to: admin/admin.
The script will first make a backup of the current flash image; this procedure takes about 4 minutes. Use -h to get help on all the options. If there's some failure, the only recourse is to install a JTAG header and restore the firmware via JTAG; so, use at your own risk!
You will need to download and install python located here http://python.org/ftp/python/2.6.2/python-2.6.2.msi (for windows) and enter then at the DOS command line you will enter the info below. You may need to put your files in the install directory of python (ex. c:\python26)
 Windows 7
Users must enable telnet under Control Panel -> Programs -> Turn Windows features on or off Current secondary telnet port is 8083 for Rev C/D and you may have to edit the Jungo-image.py script to reflect port 8083.
You may have to install Python from your respective distribution's repository if you do not have it, but so long as you can point to the redboot image you should be able to have the files anywhere.
 Basic Usage
- Help: python jungo-image.py -h
- Backup existing image: python jungo-image.py -d -p <password> <router ip address>
- Write new redboot: python jungo-image.py -p <password> <router ip address> <redboot file>
The RedBoot prompt is accessible via telnet 192.168.1.1 9000 on the Wan and LAN ports. After establishing the 1st telnet session to RedBoot, the flash must be initialized and configured:
- Initialize flash: fis init -f
 Configure MAC addresses (initial setup only) but seems not to work
- fconfig npe_eth0_esa 0x00:0x01:0x02:0x03:0x04:0x05 (The "0x" tell's the redboot that its hex code.). Use the MAC address at the bottom of the unit plus 3. The one printed on the bottom is for the WAN, but we need to tell RedBoot what the LAN port MAC address is.
- fconfig npe_eth1_esa 0x00:0x01:0x02:0x03:0x04:0x05 tells Redboot the LAN mac. You can use the MAC printed on the bottom label +1 hex.
 Installing DD-WRT
The RedBoot prompt is accessible via telnet 192.168.1.1 9000 on the Wan and LAN ports.
- Install and configure your favorite TFTP server to serve the dd-wrt image as linux.bin
- Load linux.bin into memory: load -r -b 0x600000 -h <hostip> linux.bin
- Write linux.bin to flash: fis create linux
This may take a while, be patient. Proceed to the next step when you get the redboot prompt back.
 Configure Redboot
In order to autonomously boot to the DD-WRT kernel you just installed, you need to add a boot script to RedBoot:
- Open RedBoot's configuration: fconfig -d
- When prompted with Run script at boot, change the value to true
- Enter the following in the first line of the script enter: fis load linux
- Enter the second line: exec
- Hit enter to finish the script with an empty line.
- Change the timeout setting for loading the script to about 5 sec.
- Keep hitting enter until you get this prompt: Update RedBoot non-volatile configuration - continue (y/n)?.
- Type y and enter.
- Power cycle the router and dd-wrt should boot.
- Intel® XScale® IXP422 266MHz Processor
- 16Mbytes SDRAM
- 4Mbytes Flash
- 10/100 Base-TX Ethernet "WAN" Port
- 10/100 Base-TX Marvell 88E6060 4-port switch
- 1 RS-232 Serial Port (internal)
 Serial port
Connect the level shifter to the 4 Port serial header JP1 on the mainbord. Most outside hole is 1 (GND). VCC has an additional marking on the mainbord.
1 | GND 2 | TXD 3 | RXD 4 | VCC