I2C Master + BOA webserver (µClinux)

There already is a device driver for the OpenCores I²C Controller.

in my Kernel configuration I see this: (I set the [*] where I suppose you need them.)

Device Drivers  --->    
<*> I2C device interface    
<*> I2C support  --->    
I2C Hardware Bus support  ---> 
     *** I2C system bus drivers (mostly embedded / system-on-chip) ***   
<*> OpenCores I2C Controller 
< > Simtec Generic I2C interface (NEW)   
         *** External I2C/SMBus adapter drivers ***     
< > Parallel port adapter (light) (NEW)      
< > TAOS evaluation module (NEW)      
                *** Other I2C/SMBus bus drivers ***                
< > PCA9564/PCA9665 as platform device (NEW)     
< > I2C/SMBus Test Stub (NEW)

So you don't need to use hardware registers or interrupts in your own code. You just need to create an appropriate driver for the I²C chip you want to use. For communication with the chip, this driver uses the "open Cores" I²C hardware via the I²C subsystem. Seehttp://www.nioswiki.com/OperatingSystems/UClinux/Video for more info.

There seem to be six chip drivers provided that use this bus. you might take a look at their source code to find out how to access the I²C subsystem.

-Michael