as far as i know, the bcm4400 driver for that device needs at least kernel 2.4.23 while SME runs kernel 2.4.20.
so you have to upgrade the kernel first and compile the driver. But there is no compiler in SME-standard.
there is a how-to which describes how to integrate the compiler into SME.
many things to do, better would be to insert another NIC in the pundit.
cheers