Overo-second-nic-patch is a project mainly written in ..., it's free.
Short duration project to manage u-boot change for Tobi-Duo board
Tobi-duo u-boot patch for the second lan.
Tested against Sakoman's omap3-v2009.11.1 u-boot branch using a 2.6.34 kernel.
The basic speed issue for the second nic appears to be okay. Not a big increase so not urgent.
More testing to do. Something strange happening when both nics are being used simultaneously.
The patch is not for an OE build of u-boot, but for a regular u-boot build.