Latest Kernel on Zaurus SL-5500

Hi,

I have a Zaurus SL-5500 running on Kernel 2.4.6 and have been using
Zeeswan extensively for IPSec, both for IPv4 and IPv6.
I want to upgrade to newer Kernels and hopefully use the Kernel IPSec.
Is anyone working on 2.6 for SL series?
I checked out OZ, but the stable release that they have also seems to be
based on 2.4.6 Kernel. Any pointers in this regard would be very helpful.
Even a Kernel 2.4.20 or something for SL-5500 would be nice, in which
case I can look at Herbert Xu's back-ports for IPSec.

Thanks & regards,
Suvidh