The MR2600 is a rebranded (or same ODM) D Link DIR-882 with a different plastic case, but the MR doesn't come with a rear USB 2.0 port. The FCC photos for each are identical otherwise, right down to the silkscreened board revision.

There's already an OpenWRT image for the DLink model, so coming up with an entry for the Motorola version shouldn't be hard.