MTD help

[itche]

hello all, 
thanks for all those who replied to my previous messages.
I am still stuck.
I am trying to make this nand to work
i can get the device id and creating the partitions with no problem.
i have a problem with erasing, mounting, etc.
i think my problem lies with the R/!B line.
it is connected to my 5272 on PB4.
i have no problem to access the other control lines.
how do i "make" the driver to look at this line on PB4?
is there a file where these definitions are defined?

i am using uclinux 2.4.19 
i have modified NAND.C and created my own board specific .C fie as well.  

thanks in advance 
Isack