We just posted an update to our production U-Boot to include support for the Nitrogen6 Max board.
This release is still based on U-Boot 2014.04 from up-stream and consists mainly of additional (custom) boards, so there’s no reason to upgrade unless you need something specific.
We’re pushing this into our production branch to make way for updates to U-Boot 2014.07 and will push fairly quickly to U-Boot 2014.10 thereafter.
As always, we saved the previous production branch into production-before-20140912.
You can grab a package of binaries from the usual place:
U-Boot > bootfile=u-boot.nitrogen6q ; run upgradeu
The file name for the Nitrogen6 Max board is u-boot.nitrogen6_max.
The full list of binary files for various boards and configurations is available here in our U-Boot on i.MX6 page.