[yocto] Problems fetching branch for linux-yocto-custom

[Bruce Ashfield]

On 13-06-12 4:41 PM, Trevor Woerner wrote:
> On Wed, Jun 12, 2013 at 3:37 PM, Bryan Evenson <bevenson at melinkcorp.com> wrote:
>> # Added KBRANCH spec
>> KBRANCH = "linux-3.9-at91"
>>>> # Override SRC_URI in a bbappend file to point at a different source
>>> #
>>>> tree if you do not want to build from Linus' tree.
>>>> SRC_URI = "git://github.com/linux4sam/linux-at91.git;branch=linux-
>>> 3.9-
>>> at91;tag=dcdf169e24c0cb6d7dc69e0a09d2395934e95075;protocol=git;nochecko
>>> ut=1"
>>
>> # Changed SRC_URI to following
>> SRC_URI = "git://github.com/linux4sam/linux-at91.git;branch=${KBRANCH};protocol=git;nocheckout=1"
>
> It looks like all you did was to define the string "linux-3.9-at91" in
> its own variable, put that in your SRC_URI string, and remove the
> "tag=..." field. Would your original recipe have worked if all you did
> was remove the "tag=..." field?
>
> Is KBRANCH being used somewhere else? Doesn't bitbake's "git" fetcher
> already have a generic way of specifying a branch? Why would a kernel
> recipe need to also define a branch variable? Do non-kernel recipes
> also need to define some kind of branch variable too?

This is specific to the linux-yocto branch management. It is passed to
the configuration subsystem (and others) to properly prepare and process
the kernel.

It doesn't have anything to do with the fetcher.

Remember. linux-yocto is a set of standalone tools, mapped to bitbake
and yocto, so we are passing in what the tools need to work.

Cheers,

Bruce

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