WRT54G

Hardware

Linksys hack

Linksys WRT54G specs summary

Specs

Ports:

• WAN: One 10/100 RJ-45 port for WAN connectivity
• LAN: Four 10/100 RJ-45 Auto-MDI(X) switched ports
• WLAN: 54mbps 802.11g on a MiniPCI card (1.0)/built-in (1.1) with dual external RP-TNC antenna ports

LED Indicators (1.0):

• Power, DMZ, Diag
• WLAN: Act, Link
• LAN: Link/Act, Full/Col, 100
• Internet: Link/Act, Full/Col, 100

Channels: 1-11 (USA)

System requirements: One PC (200MHz or Faster Processor) with: 64MB RAM, Internet Explorer 4.0 or Netscape Navigator 4.7 or Higher for Web-based Configuration, CD-ROM Drive, Microsoft Windows 98, Me, 2000, or XP, a 802.11g or 802.11b Wireless Adapter with TCP/IP Protocol Installed or Network Adapter with Category 5 Ethernet network cable and TCP/IP Protocol installed

In the box: Wireless-G Broadband Router, Power Adapter, Setup CD-ROM with User Guide, Ethernet Network Cable, Quick Installation guide, Registration Card

Device details:

• Width: 7.32 inches
• Height: 1.89 inches
• Depth: 6.89 inches
• Warranty, parts: 1-year limite
• Warranty, labor: 1-year limited

Transmit Power: 15 dBm (Can be increased to 20db/84mw) (FIX: 84mw=19.24db) Info: 15db=31mW 17db=50mW 20db=100mW

Receiver Sensitivity (unconfirmed):

• -65db for ofdm 802.11g 54 megs
• -80db for dsss 802.11b 11 megs

Power (1.0?): 5V @ 2.0A, center

Power (2.0): 12V @ 1.0A, center positive. (Regulated internally down to 3.3V by an AnaChip? 1501-33, so the unit should be very tolerant of input fluctuations from 5 to 40 volts. Get the polarity right and it'll make do with whatever you give it.)

To turn on ripd and zebra, go to Advanced -> Routing -> Dynamic Routing and click Apply."

Firmware

Sveasoft

linksys: adding files to the code.bin firmware

Community I developed a script to add custom files into the Linksys filesystem. This was needed, for example, to add ripd.conf and zebra.conf to /usr/local/etc for the zebra routing daemon.

This is how it works ($LINKSYS_SRC is the directory of your linksys source code eg. /home/djohnson/downloads/linksys/sveasoft/Alchemy-2.3.4/)

1. Copy the script (makeimage.sh) to $LINKSYS_SRC/src/router 2. Copy files that you need to the $LINKSYS_SRC/src/router/mipsel-uclibc/target directory (you can make directories and add/delete files in here) 3. Execute the makeimage.sh script from the $LINKSYS_SRC/src/router directory 4. A new code.bin will be built which can be uploaded to the linksys box

The makeimage.sh script looks as follows:

1. $include .config
2. iLINUIXDIR=(shell pwd)
3. echo $LINUXDIR
4. export LINUXDIR
5. export PLATFORMDIR := $(TOP)/$(PLATFORM)
6. export INSTALLDIR := $(PLATFORMDIR)/install
7. export TARGETDIR := $(PLATFORMDIR)/target

../linux/linux/scripts/squashfs/mksquashfs mipsel-uclibc/target mipsel-uclibc/target.squashfs -noappend cp ../linux/linux/arch/mips/brcm-boards/bcm947xx/compressed/vmlinuz mipsel-uclibc ../../tools/trx -o mipsel-uclibc/linux.trx mipsel-uclibc/vmlinuz mipsel-uclibc/target.squashfs

cp ../linux/linux/arch/mips/brcm-boards/bcm947xx/compressed/zImage mipsel-uclibc dd conv=sync bs=64k < mipsel-uclibc/zImage > mipsel-uclibc/linux.bin cat mipsel-uclibc/target.squashfs >> mipsel-uclibc/linux.bin

cp mipsel-uclibc/linux.trx ../../image/linux.trx cp ../../image/linux.trx ../../image/code.bin