The problem with ARM is there is no 'generic' platform, devices tend to differ considerably.. so drivers have to be written.
Just because they support the PXA255 XScale processor doesn't mean they support this device.
I found a small mention of it on an NetBSD mailing list, but that's about it.
http://mail-index.netbsd.org/port-hp...2/04/0000.html
http://mail-index.netbsd.org/port-hp...2/04/0001.html
Hope that helps.