How was iPodLinux originally ported to the Ipod?

[saratoga]

I'm curious how the iPod was reverse engineered.  Since Rockbox took so much of the code whole from that project, I didn't hear about the work involved.  Does anyone have a link explaining how it was originally done?

[safetydan]

I know this isn't the full story, but part of it was done by having the firmware dumped via the piezo. More information here http://ipodlinux.org/stories/piezo/

[saratoga]

I saw that, which is what got me interested.  However, they don't say how they were able to get the piezo code running without first getting access to the firmware.