Difference between revisions of "Connect to a modified router"
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In Kermit, after the configuration commands have been entered, it was as easy as typing <code>connect</code>. Once connected, press <code>Enter</code> to get a console from [[OpenWRT]]. This should function just about identically to the ssh console, and if it works correctly, it means that the serial port has been correctly installed. | In Kermit, after the configuration commands have been entered, it was as easy as typing <code>connect</code>. Once connected, press <code>Enter</code> to get a console from [[OpenWRT]]. This should function just about identically to the ssh console, and if it works correctly, it means that the serial port has been correctly installed. | ||
| − | === Task Five: Access | + | === Task Five: Access the Common Firmware Environment CLI === |
| + | This will be filled in, but here's the basics: | ||
| + | * Make sure boot_wait is on (this should be added to the Install OpenWRT HOWTO) | ||
| + | * Reboot the router (<code>reboot</code> or power cycle). | ||
| + | * Hit CTRL+C on your serial console. | ||
| + | * You're in. | ||
== What to do next? == | == What to do next? == | ||
Revision as of 13:58, 6 March 2007
Summary
This will explain how to connect to the serial ports on a modified LinkSys WRT54G using serial communication software such as the open source Kermit.
Before Starting
Expose a serial port on the router
You must have successfully modified a LinkSys WRT54G to expose at least its first serial port in such a way that you can connect it to another machine with serial communications software. If you have not done so yet, please see HOWTO:Modify the Linksys hardware
Acquire serial communication software
A solid open source suite of communication software known as Kermit has served us well as a method of communicating with the WRT54G. C-Kermit, the UNIX compatible implementation, is available for download at their website [1].
Steps to Connect to the Router
Task One: Power up the Router
Yes, that means plug it in.
Task Two: Connect Serial (& Optionally Network) Cable(s)
Ensure that the connection is going from UART0 (the first serial port--you did label them didn't you?) as this is where the console will be running.
Also, because the goal is to upload custom code to the router, it would be a good idea to connect the router to your network by wiring it up via one of the numbered LAN ports on the back of the router (NOT the Internet/WAN port).
Task Three: Configure your Serial Communication Software
The connection used by the router's serial port is fairly standard: 115200bps, with 8 data bits, no parity bit, and 1 stop bit, or 8N1.
In our setup, once running Kermit on the external machine, we connected by typing in:
set line /dev/tty000
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to select the serial device that is connected to the router. | |
set serial 8n1
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which is not really necessary since this is default. | |
set speed 115200
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as given to us in the router specifications. |
Task Four: Connect to the OpenWRT Console
In Kermit, after the configuration commands have been entered, it was as easy as typing connect. Once connected, press Enter to get a console from OpenWRT. This should function just about identically to the ssh console, and if it works correctly, it means that the serial port has been correctly installed.
Task Five: Access the Common Firmware Environment CLI
This will be filled in, but here's the basics:
- Make sure boot_wait is on (this should be added to the Install OpenWRT HOWTO)
- Reboot the router (
rebootor power cycle). - Hit CTRL+C on your serial console.
- You're in.
