Choose kernel in NSLU2

[Xan <dxpublica@telefonica.net>]

Hi,

I have several kernels in NSLU2 with debian installed (squeeze):

$ dpkg -l "linux-image*" |grep "ii"
ii  linux-image-2.6-ixp4xx               2.6.32+29                    
Linux 2.6 for IXP4xx (meta-package)
ii  linux-image-2.6.26-2-ixp4xx          2.6.26-26lenny2              
Linux 2.6.26 image on IXP4xx
ii  linux-image-2.6.32-5-ixp4xx          2.6.32-38                    
Linux 2.6.32 for IXP4xx
xan@caixa:~$


and

$ uname -a
Linux caixa 2.6.32-5-ixp4xx #1 Mon Oct 3 12:19:10 UTC 2011 armv5tel 
GNU/Linux


I want to know:

a) how can I choose that other linux version boots my system: 
dpkg-reconfigure what?
b) can I follow the general howto to build my own kernel and make dpkg 
-i my-kernel.deb ?

I'm interested, overall, in (a).


Thanks in advance,
Xan.