[OE-core] is "LINUX_VERSION" actually needed for a kernel checkout?

[Bruce Ashfield]

On Sat, Jul 14, 2012 at 3:07 PM, Robert P. J. Day <rpjday at crashcourse.ca> wrote:
>
>   pawing my way through the kernel recipe file and checkout code so i
> understand it once and for all, and i'm curious about the setting of:
>
> LINUX_VERSION ?= "3.4.4"
>
> in linux-yocto_3.4.bb.
>
>   for my example, i'm testing with straight oe-core and building for
> qemuarm, so i can see the following relevant lines from the kernel
> recipe file that will affect my kernel checkout:
>
> KBRANCH_qemuarm  = "standard/arm-versatile-926ejs"
> SRCREV_machine_qemuarm ?= "9aca8fec49787efbe44d0f137f31ee59edd94c49"
> SRCREV_meta ?= "a8cf77018b0faa0d29f1483ff4e5a2034dc8edd5"
>
> SRC_URI =
> "git://git.yoctoproject.org/linux-yocto-3.4.git;protocol=git;nocheckout=1;branch=${KBRANCH},meta;name=machine,meta"
>
> LINUX_VERSION ?= "3.4.4"
>
>   as i read the docs (and i could be totally off-base), the KBRANCH
> variable identifies the branch i want for my checkout, while the
> SRCREV_machine variable identifies the particular commit on that
> branch that i want (typically, it's a merge of standard/base into that
> branch).  and of course, SRCREV_meta is the state of the meta branch i
> want for further configuration.
>
>   but at no time did i need to know the tagged kernel version that my
> machine branch was based on, did i?  so for the purposes of what
> happened above, i didn't *require* the value of LINUX_VERSION, did i?
>
>   i can see that it will be handy in, say, creating meaningful
> directory names for building.  but beyond that, what else is it used
> for?  (i haven't got to the meta/ directory processing yet, so i have
> no idea whether it's suddenly necessary there.)

The kernel itself doesn't care .. but the rest of the system does,
since that is used
for setting PV.

Cheers,

Bruce

>
> rday
>
> --
>
> ========================================================================
> Robert P. J. Day                                 Ottawa, Ontario, CANADA
>                         http://crashcourse.ca
>
> Twitter:                                       http://twitter.com/rpjday
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> ========================================================================
>
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