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programming I2C

Hi all, 
  I'm trying to access to an i2c device which i connected to the 
  board Etrax 100LX. 
  I have made a program to access to it, but i didn't get it. 
  I tried to open the i2c driver (7dev7i2c) but when i setup the 
  device number, it gives an error. 
  how can i access to that i2c device?