[foxboard] problems with i2c

[epsoniktg]

Hi,

I'm trying to use the i2c bus to communicate between my fow lx and another 
board.

but it seems I barelly can't open the i2c driver.
here's my code:
class I2C
{
public:
  I2C::I2C()
  {
    i2c = open("/dev/i2c", O_RDWR);
  }
  I2C::~I2C()
  {
    close(i2c);
  }
  int getI2C() const
  {
    return i2c;
  }
protected:
  int i2c;
};

when i use it, the i2c has a value <= 0 (I get the same results when I just do 
the open line and test the value it returns).

Any particular trick for this to work??