USB re-enumeration after kexec

Hi all,
In my application (based on OMAP3530) I need to load and execute a new 
kernel zImage using kexec.
I have several devices connected to host USB (thru HUB) and I need to 
re-enumerate after kexec without phisycal disconnect and reconnect.
Is there any way to do this action by SW?

Regards,
Andrea