Re: module compilation on 2.6

From: Fred Fedora (fedorafred2000_at_yahoo.com)
Date: 06/19/04

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    Date: Fri, 18 Jun 2004 16:10:29 -0700 (PDT)
To: For users of Fedora Core releases <fedora-list@redhat.com>

    Rick,
    Thanks for explaining. Is there some sample makefile which ahieves this trick somewhere on teh web? I just downloaded ATMEL code from sourceforge to find if they have some clues.
    --Prasad

    Rick Stevens <rstevens@vitalstream.com> wrote:
    Fred Fedora wrote:
    > Rick,
    > Thanks for the reply. Should the module code be physically located
    > inside the kernel source tree(/usr/src/linux-kernel-version??)?
    > I had a module built outside kernel tree on 2.4. Things compiled OK. I
    > want to check itout (using the same make commands) on 2.6 and I get
    > bunch of errors.
    > Is irq_vectors.h automatically picked by kernel using some variable?

    If the module's source is designed correctly, it'll look for the kernel
    headers it needs by looking at /lib/modules/`uname -r`/build. Under
    2.4, this is generally a symlink to the actual kernel source directory.
    In 2.6, it's typically a directory that contains all of the necessary
    source (headers and whatnot) to build your module.

    The trick is that the module MUST be designed with 2.6 in mind. A quick
    search for the file you have problems with lists four "irq_vectors.h"
    files based on the basic system architecture, "mach-default",
    "mach-visws, "mach-voyager" and "mach-pc9800". The module's Makefile
    must understand this to grab the right file.

    So providing the module is 2.6-aware, yes, you should be able to build
    your module outside the kernel source tree. I know it works as I've
    built several drivers that way (for example, the atmel driver for
    atmel-based wireles LAN cards).

    > */Rick Stevens /* wrote:
    >
    > Fred Fedora wrote:
    > > Is module compilation diffrent for 2.6 kernel from 2.4? I am get
    > tons of
    > > erros.
    > > Any hints?
    > > (irq_vectros.h not found etc. are my errors).
    >
    > 2.6 kernel building is a lot different. Your best bet is to do it
    > from ground zero:
    >
    > # cd /usr/src/linux-whatever
    > # make mrproper
    > # make xconfig -or- make gconfig -or- make menuconfig
    > (load an existing config file or set things up as you wish)
    > (save this new config)
    > # make
    >
    > ----------------------------------------------------------------------
    > - Rick Stevens, Senior Systems Engineer rstevens@vitalstream.com -
    > - VitalStream, Inc. http://www.vitalstream.com -
    > - -
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    -- 
----------------------------------------------------------------------
- Rick Stevens, Senior Systems Engineer rstevens@vitalstream.com -
- VitalStream, Inc. http://www.vitalstream.com -
- -
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