Netgear WGT634U-based Network Stumbler

This is a description of how RussellSenior goes about building a stumbler device based on the NetgearWgt643u and OpenWrt. This is experimental software. Follow these instructions at your own risk. Based on the excellent trailblazing work and example provided by JasonMcArthur.


Building OpenWrt Software

Currently, I am using the buildroot-ng svn tree. This description is based on the already obsolete r4902.

cd /src/openwrt
svn co 
svn co 
cd /src/openwrt/buildroot-ng/openwrt/package 
for i in $(find ../../../packages -type d | grep -v .svn | awk -F/ 'NF==6') ; do echo $i ; ln -s $i $(echo $i | awk -F/ '{ print $6 }') ; done

# add package infrastructure for an older version of gpsd (v2.9)
mkdir /src/openwrt/buildroot-ng/openwrt/package/gpsd-old
cd /src/openwrt/buildroot-ng/openwrt/package/gpsd-old
mv gpsd-old-makefile Makefile

cd /src/openwrt/buildroot-ng/openwrt
make menuconfig

In the menuconfig, I set the Target System to (Broadcom BCM47xx/53xx [2.6]), and for kicks I also "Select all packages by default" and enable a few things (which I am currently forgetting) that don't automatically get configured in. Often, you will find packages that won't build for some reason or another. In those cases, open a ticket, deconfigure the package in menuconfig and try again. Run make alone to see abbreviated messages, or make V=99 to get lots of information. The configuration I used for r4902 can be found [ here].

When the build is complete, the resulting files will be found thusly:

Additionally, as of my recent attempts, the Packages file that is needed for the ipkg utility to function properly later on is apparently not constructed (maybe I missed it), but I developed a script that does it for me:



rm -f ${PKGSFIL}

for i in $(find ${CTRLDIR} -name 'control' | grep CONTROL) ; 
  do echo $i ; 
  PACKAGE=$(grep ^Package: $i | cut -d' ' -f2) ; 
  VERSION=$(grep ^Version: $i | cut -d' ' -f2) ; 
  ARCH=$(grep ^Architecture: $i | cut -d' ' -f2) ; 
  if [ -f ${IPKG} ] ; then
      SIZE=$(wc -c ${IPKG} | cut -d' ' -f1) ; 
      MD5=$(md5sum ${IPKG} | cut -d' ' -f1) ; 
      cat $i >> ${PKGSFIL} ; 
      echo "Filename: ${FILENAME}" >> ${PKGSFIL} ; 
      echo "Size: ${SIZE}" >> ${PKGSFIL} ; 
      echo "MD5Sum: ${MD5}" >> ${PKGSFIL} ; 
      echo "" >> ${PKGSFIL} ; 
      echo "${FILENAME} NOT FOUND!"

Now, you can copy the ipkg repository somewhere wget'able, e.g.:

rsync -v -a -H /src/openwrt/buildroot-ng/openwrt/bin/packages/

Checking out the WGT634U

If this is a new device, it is probably a good idea to check it out on the stock firmware first to make sure it functions.

The Flash Environment

There is more than one way to flash the newly-built image onto the WGT634U.

CFE TFTP Flash-From-Console Method

This is the method I tend to use. For this, you will need a TFTP server and a serial console cable. On my debian/unstable box, I use the tftpd-hpa package.


Adding Sound

For this, you need a usb-audio device and some additional software: