> Hi, > > I am trying to understand the magic behind memory mapped I/O in linux > device drivers. I understand the concepts behind setting up memory > mapped I/O but I am confused about how the data (once written into > memory) gets transferred onto the bus and onto the peripheral. "Memory mapped I/O" means taht through the specified address, mapped in the address space, you actually send data to the device. It means you map I/O buffers on the device into addressable memory. After that, everything you write at these addresses will go to the device as set up, not to memory. > > E.g. many network drivers use memory mapped I/O and this makes it quite > generic but how do you specify the bus in all this? All the memory mapped I/O setup does the job. > > Thanks for any help, > Amit > _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
