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Starting with the iPod Classics and the Video Nanos, libgpod needs an
additional configuration step to correctly modify the iPod content. libgpod
needs to know the so-called iPod "firewire id", otherwise the iPod won't
recognize what libgpod wrote to it and will behave as if it's empty.

There are two ways to set up the iPod to make libgpod able to find its firewire
id.

The 1st one is mostly automated. First, make sure you have libsgutils installed
before running configure/autogen.sh. If you built libgpod without it, install
it and run configure/make/make install. You should now have an
ipod-read-sysinfo-extended tool available. Run it with the iPod device path
(eg /dev/sda) and the iPod mount point (eg /mnt/ipod) as arguments. This may
require root privileges. ipod-read-sysinfo-extended will read an XML
file from the iPod and write it as
/mnt/ipod/iPod_Control/Device/SysInfoExtended. See
http://ipodlinux.org/Device_Information for more details about the method used.
Having that file is enough for libgpod to figure out the iPod firewire id.

The 2nd method requires more manual intervention. First, you need to get your
firewire id manually. To do that, run "sudo lsusb -v | grep -i Serial" (without
the "") with your iPod plugged in, this should print a 16 character long string
like 00A1234567891231. Once you have that number, create/edit
/mnt/ipod/iPod_Control/Device/SysInfo (if your iPod is mounted at /mnt/ipod).
Add to that file the line below:
FirewireGuid: 0xffffffffffffffff
(replace ffffffffffffffff with the string you obtained at the previous step)
Save that file, and you should be all set. Be careful when using apps which
lets you manually specify which iPod model you own, they may overwrite that
file when you do that. So if after doing that libgpod still seems to write
invalid content to the iPod, double-check the content of that SysInfo file to
make sure the FirewireGuid line you added isn't gone. If that happens, readd it
to the end of the file, and make sure libgpod rewrite the iPod content.