[oe] u-boot update question

[Sledz, Steffen]

We like to update u-boot for our OXNAS machine from 1.1.2 to the newer version 2009.03.

The first idea was to create a new u-boot_2009.03.bb.

But then i found u-boot_git.bb and i thought this recipe seems to be the better way. I added 

  SRCREV_oxnas = "e60beb13cf0135dc71c541021487b5ccc4d269cb"

which seems to be the hash from 2009.03. Or is there a way to use the tag v2009.03 directly?

And there is another question. How do i persuade bitbake to use u-boot_git.bb instead of u-boot_1.1.2.bb? I couldn't find DEFAULT_PREFERENCE items for the other machines in both recipes so i assumed that the git recipe is preferred to the other. But a "bitbake u-boot" still builds from 1.1.2 .  :(

Steffen