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Table of Contents
Chapter 1 Introduction ..................................................................................................1-1
Overview.................................................................................................................................. 1-2
Software Architecture .............................................................................................................. 1-2
Journaling Flash File System (JFFS2)........................................................................ 1-3
Software Package ....................................................................................................... 1-4
Chapter 2 Getting Started .............................................................................................2-1
Powering on the W311/321/341............................................................................................... 2-2
Connecting the W311/321/341 to a PC.................................................................................... 2-2
Serial Console ............................................................................................................ 2-2
Telnet Console............................................................................................................ 2-3
SSH Console .............................................................................................................. 2-4
Configuring the Ethernet Interface .......................................................................................... 2-5
Modifying Network Settings with the Serial Console................................................ 2-5
Modifying Network Settings over the Network ......................................................... 2-6
Configuring the WLAN ........................................................................................................... 2-6
IEEE802.11a/b/g ........................................................................................................ 2-6
Using WPA_SUPPLICANT to Support WPA and WPA2.......................................................2-11
SD Slot and USB for Storage Expansion................................................................................2-11
Test Program—Developing Hello.c....................................................................................... 2-13
Installing the Tool Chain (Linux)............................................................................. 2-13
Checking the Flash Memory Space.......................................................................... 2-13
Compiling Hello.c .................................................................................................... 2-14
Uploading and Running the “Hello” Program.......................................................... 2-15
Developing Your First Application ........................................................................................ 2-15
Testing Environment ................................................................................................ 2-16
Compiling tcps2.c..................................................................................................... 2-17
Uploading and Running the “tcps2-release” Program.............................................. 2-18
Testing Procedure Summary .................................................................................... 2-20
Chapter 3 Managing Embedded Linux ........................................................................3-1
System Version Information..................................................................................................... 3-2
System Image Backup.............................................................................................................. 3-2
Upgrading the Firmware............................................................................................. 3-2
Loading Factory Defaults........................................................................................... 3-5
Backing Up the User Directory.................................................................................. 3-5
Deploying the User Directory to Additional W311/321/341 Units ............................ 3-6
Enabling and Disabling Daemons............................................................................................ 3-6
Setting the Run-Level.............................................................................................................. 3-8
Adjusting the System Time...................................................................................................... 3-9
Setting the Time Manually ......................................................................................... 3-9
NTP Client................................................................................................................ 3-10
Updating the Time Automatically............................................................................. 3-10
Cron—Daemon to Execute Scheduled Commands ................................................................3-11