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rtl_printf an floating point



hello
i am using floating point in rt module and i would like to see some
results (for debugging) by using rtl_printf
but if i write  rtl_printf("%f", var) with var declared as double i just
see   %f   in /var/log/messages
how can i do to see this var value?
i use rtl3.0 pre9
thank you for your help