I2C interface on Linux (with MMU)

I have verified: M41T0.

Here is the relevant output from boot:

i2c /dev entries driver
rtc-ds1307: probe of 0-0068 failed with error -5
i2c-0: I2C OpenCores Bus Adapter, MMIO = 0x2120C00, irq = 9
i2c-0: Using 85000kHz clock source

And when I run i2cdetect:

/#  i2cdetect 0
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-0.
I will probe address range 0x03-0x77.
Continue?  y
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --                         

I have verified in the part data sheet that the device address is 0x68.

I finally got my hands on the Microtronix driver, but it is in a full linux distribution, for nios2nommu.

I'm working on getting the relevant pieces transfered into the MMU build.