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EPP support in parport.c


Can someone explain me why in the parport.c code in the 
arch/cris/drivers directory the epp and ecp functions point to the 
software simulated functions and not the native read/write functions 
that are supported by the ETRAX chip.
I need to interface a 'device bus' to the EPP port and would like to use 
them, is it OK to modify the parport driver to use the native ones ?