Thanks Marshall, I could download but it seems bitbake still tries to get it remotely 
(after bitbake -c clean virtual/kernel and bitbake virtual/kernel) :

From git://www.sakoman.com/git/linux-omap-2.6
 * branch            omap-2.6.39-pm -> FETCH_HEAD
NOTE: Creating tarball of git repository
fatal: failed to unpack tree object ed0d909828929e2616a8ff6b1cc932c081ffac29
ERROR: TaskFailed event exception, aborting
ERROR: Build of /local/mathiasfk/overo-oe/user.collection/recipes/linux/linux-omap-pm_2.6.39.bb do_fetch failed
ERROR: Task 8 (/local/mathiasfk/overo-oe/user.collection/recipes/linux/linux-omap-pm_2.6.39.bb, do_fetch) failed with 256
ERROR: '/local/mathiasfk/overo-oe/user.collection/recipes/linux/linux-omap-pm_2.6.39.bb' failed
NOTE: Task failed: Fetch failed: Unable to fetch URL git://www.sakoman.com/git/linux-omap-2.6;protocol=git;branch=omap-2.6.39-pm from any source.
NOTE: package linux-omap-pm-2.6.39-r90-pm2+gitred0d909828929e2616a8ff6b1cc932c081ffac29: task do_fetch: Failed
ERROR: TaskFailed event exception, aborting
ERROR: Build of /local/mathiasfk/overo-oe/user.collection/recipes/linux/linux-omap-pm_2.6.39.bb do_fetch failed
ERROR: Task 8 (/local/mathiasfk/overo-oe/user.collection/recipes/linux/linux-omap-pm_2.6.39.bb, do_fetch) failed with 256
ERROR: '/local/mathiasfk/overo-oe/user.collection/recipes/linux/linux-omap-pm_2.6.39.bb' failed
ERROR: '/local/mathiasfk/overo-oe/user.collection/recipes/linux/linux-omap-pm_2.6.39.bb' failed


--
Mathias Falconi Kriebel
Estudante de Engenharia de Controle e Automação
Universidade Federal de Minas Gerais


> Date: Fri, 5 Aug 2011 10:19:14 -0500
> From: maroc81@gmail.com
> To: gumstix-users@lists.sourceforge.net
> Subject: Re: [Gumstix-users] Low Power How to
>
> Create a directory in your overo-oe/sources/git/ directory called
>
> www.sakoman.com.git.linux-omap-2.6
>
> Change into that directory and run
>
> git clone git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm.git;protocol=git;branch=pm
>
> That should pull the git sources and put them in the .git directory.
> After that try and run the kernel recipe again.
>
> Marshall