SMC2 uart problem when using SCC3 as hdlc

I use an MPC880, SMC1 as uart, SMC2 as uart, SCC3 as HDLC are used. When I 
compile support for SCC3 hdlc in the kernel, the SMC2 stops working. It 
hangs, sometime kernel reboots.

Any relocation patch should be used?
As far as I know should not be needed! 

Bye,
Antonio.