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    SubjectRe: Where I can find the guide/help to device driver development
    On Sun, 15 Apr 2012 00:37:04 -0400 (EDT)
    David Miller <> wrote:

    > From: Vishal Nandanwar <>
    > Date: Sun, 15 Apr 2012 09:59:02 +0530
    > > I am new in Linux device driver development. Currently I am learning
    > > drivers from the book "Linux device drivers" by Rubini. This book is
    > > quite big and quite boring. What are the ways to learn the drivers?
    > >
    > > Do any one have any guide in video or PPT format or in any other format?
    > Sorry, nobody is going to produce and direct a science fiction film
    > about kernel development just to make it more interesting for you.

    I don't know...this could actually be kind of fun...


    Our hero Luke is happily gaming away when his whole system goes up in
    flames. He encounters a pompous whitespace-specialist robot accompanied by
    an R2-format USB stick in search of Obiwan Rubini. Luke realizes he knows
    Obiwan, a reclusive, bearded figure seen as boring by younger folks, but
    known to the older generation as the source of great wisdom. Obiwan is
    able to decrypt a video on the R2, finding a plea for help from Princess
    Leianux, who is in great need of help.

    Obiwan takes the group to the Black Thorn Cantina, known to be an
    occasional gathering place for great hackers in the early days; there they
    encounter Alan Solo, who is able to offer the services of his beat up old
    development system. As they travel, Obiwan begins to teach Luke the
    secrets of the Gnudi Hackers and how to use the light side of The Source.
    Luke gets frustrated; it seems he is spending all his time being zapped by
    compilation errors and configuration variables, but Obiwan insists that one
    must follow the path, even if it's boring, lest one end up on the dark
    side, where binary blobs and DRM are to be found.

    There is an early encounter with Darl McVader and his fearsome squads of
    imperial IP lawyers, but our heroes are lucky: while the lawyers may look
    scary, they are unable to shoot well enough to hit the side of a Java heap
    allocator. They are able to rescue the princess and head off to join the
    rebel hackers with the top-secret Death Box datasheet that the princess was
    able to copy. Luke's training continues; by the time they join the rebels,
    he has a sense for char drivers, has learned all about printk(), and can
    sometimes feel the presence of a bug with his eyes closed. He has also,
    like any aspiring Gnudi, built his own weapon: an ftrace saber of great

    This episode ends with a climactic encounter at the Death Box, which is
    threatening our hackers with a litigation ray of unprecedented power. But,
    by this point, Luke has learned the power of kmalloc() and feels ready.
    Analysis of the datasheet, along with some rebel reverse engineering, has
    turned up a zero-day vulnerability in the Death Box; it is Luke's job to
    drop a patch into it and jailbreak the whole thing. In the end, when all
    appears lost, Luke turns off his debugger and, using his growing ability
    to be one with the Source, gets his patch in just before the merge window
    closes and everybody lives happily ever after.

    Or at least until...


    The empire discovers the rebels' secret repository and succeed in getting
    it taken off the net; the rebels, faced with injunction-bearing AT-AT
    walkers, are forced to flee. Luke, realizing that he must grow his Gnudi
    development skills, heads off to the swampy LKML system to study under the
    great master Ts'oda. He learns of block drivers, DMA, and signals, but,
    impatient to earn his place in the top-20 contributors list and heedless of
    Ts'oda's admonition that "changeset counts make not one great!", he leaves
    before his training is complete.

    Darl McBride is able to exploit this impatience to set up a race condition
    and force Luke into a triple fault situation. As the battle winds down,
    Luke learns that his nemesis is, in fact, his parent process; Darl offers a
    sharing of resources, but Luke NAKs the idea and chooses to oops instead.
    Happily he is able to kexec() into a new image, leaving open the
    possibility of a proper reboot in a future episode. Meanwhile, though,
    Alan Solo has been manipulated into a hard-frozen non-compete agreement and
    is effectively removed from the scene.


    Princess Leianux and Luke are able to rescue Alan Solo from his
    non-compete, which had been transferred to Ballmer the Hutt; the rescue
    involves an unlikely escape from the extreme Sarlacc memory leak. Luke
    returns to LKML to finish his training, hoping to learn about race
    conditions, concurrency, and mutual exclusion, but finds that the server
    has been compromised; Luke has no alternative to learning from the Source

    It seems that the Death Box is being rebooted with new firmware, a
    regression that, from the rebels' point of view, must be reverted
    immediately. The alliance stages a daring attack, hoping to shut it down
    before it goes multiuser, only to discover "It's a BPT trap!" and the Box
    is already at full capability, and, even worse, is running systemd. It
    looks like a dark time for the Gnudi.

    But Alan Solo and Leianux are able, with the help of an army of long-haired
    smellies and a simple credential-spoofing attack, to get into the shield
    generator and disable SELinux. Luke manages to defeat Darl McVader in a
    vicious editor battle, but, despite the init process's goading, is
    unwilling to kill McVader and cause himself to be reparented to Init
    directly. McVader himself attaches to Init, putting him into the zombie
    state; McVader, it seems, has cast off his binary blobs and returned to the

    The Death Box is rooted once again. Luke adds his Acked-by to the merge of
    Alan Solo and Princess Leianux, then, with signoffs from Ts'oda, McVader,
    and Obiwan Rubini, takes his place as a proper Gnudi subsystem maintainer.


    To be written in about 20 years; look for the thrilling appearance of
    Jar-Jar Bunks!

    I guess I better get some real work done now.


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