In 2008/9 I ported the linux kernel to my new HP iPAQ 214 (Also known as iPAQ 210).
On top of the kernel, I used something called the Angstrom distribution, which worked OK, but didn't really do much. All the details for that are now here:
http://www.oliford.co.uk/hpipaq214/moinBasicCopy/HpIpaq214.html
This was all on the handhelds.org wiki, but it appears to now be
broken:
http://www.handhelds.org/moin/moin.cgi/HpIpaq214
My notes and files are here:
public/
I've stopped working on all this now but a few people/groups have built significantly on work. Most notably an effort to put Android on the ipaq21x, headed by Alvin Wong:
http://sourceforge.net/p/ipaq214android
I also installed a serial port:
public/serial/
Oliver Ford