I have moved all of the info that was here to the handhelds.org wiki
With the exception currently of:
The iPAQ 214 is based on the PXA310 chip, for which support has only appeared in the mainline linux kernel very recently. The sound and touchscreen are provided by a WM9713 chip on the AC97 bus. Unfortunately the PXA3xx AC97 support is in one repository on the Wolfson Open-Source site and the touchscreen driver is in another. Building the kernel requires merging the three. The easiest way is probably by downloading my git tree by running:
git clone http://www.oliford.co.uk/hpipaq214/ipaq214.git v3
Enjoy,
Oliver Ford