i can use a virtual machine if is necessary to install debian arm and to recompile the kernel
you are way out of your depth here. what you want to do is way too difficult for you to do. first learn the basics before you try to tackle the more difficult things, ie you need to learn how to crawl before attempting to run.
I suspect zeroc87 wouldn't be attempting this if s/he didn't feel they had already learned the "basics".
However... building kernels for Zaurus (as for any exotic-flavored hardware) requires quite a firm and stable
understanding of how the device works, since mainline kernels and even the most heavily customized zaurus-specific
kernels require non-trivial amounts of attention and patience to navigate.
zeroc87: if you think the Zaurus cpu is "too slow" to build its own kernel, please recognise that it will take quite considerably
more of your time to craft a working Zaurus kernel on your PC, than it would take a Zaurus to build a kernel.
Meditate on this brick if you would :
If you're not sure what it means, please feel free to ask.