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  1. #1

    Compiling a kernel.

    Hi guys,
    I have followed the tutorial here and got my module up and running(cant put a www as i dont have 15 posts yet). My question is what device does this module actually interface with.Forgive me if it sounds stupid but I am kind of lost here.

  2. #2
    For the record, I believe you are referring to this article:

    As far as I can tell, the module created in the tutorial merely performs as an example - it does not actually interface with any device, per se. In userland, you would create (via the mknod command) a character device (like a console, versus a block device, like a disk drive) in order to "use" the module.

  3. #3
    In the tutorial the writer says
    mknod /dev/simple-driver c 250 0
    which I have done(Is this the mknod which you are referring to ?). I can also see the file when I cat it.But what I dont understand was what all that long code for registering a device was and reading from it too when there is no device actually. Once agin I aplogize for my igonrance but it is my first program indeed(of course after the hello world!).

  4. $spacer_open
  5. #4
    yes, that's what i meant by mknod.

    i guess the way you put it, the kernel module IS the device - at least that is what is registering with the kernel. even if there is no physical input device for a given kernel module, the module itself must register/un-register with the kernel. it makes more sense when you actually do have a physical device with which the kernel is communicating, of course.

    Edit: and as far as the kernel is concerned, /dev/simple-driver is a device (sort of), just as /dev/sda represents the primary hard disk.
    Last edited by atreyu; 07-06-2012 at 05:15 AM. Reason: is a device

  6. #5
    Thanks for the reply. It does make some sense now(Though the point of that tutorial I really dont get.). Do you know any good tutorials to actually get started with writing an actual usb driver. I have a usb stick which I can spare.

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