Howto get a specific kernel from kernel repository?

[Shaz]

Dear lists,

I want kernel 2.6.26-rc8 or 2.6.30 onwards for my development work on
OpenMoko. If it cannot be checked out then is there some way that I
can move around with patches to get there?

Some help will be appreciated because I am not well versed with git or
patch management. Even if some quick readings/tutorials are pointed
out that will be good too.

--
Shaz