NVIDIA has updated L4T, their "Linux For Tegra" platform, for those using NVIDIA's ARM hardware.
Linux For Tegra 15 provides preliminary U-Boot support, Vetana kernel support for U-Boot, and a new source-sync script to sync the kernel and U-Boot source-code. NVIDIA developers have also been playing around with a hardfp (ARM hard floating-point) version of the NVIDIA Linux drivers, but those are still in an alpha state. L4T 15 hardfp should be properly released "shortly", according to NVIDIA's web-site.
Linux For Tegra 15 is targeted for the NVIDIA Tegra 3 "Cardhu" and the NVIDIA Tegra 2 "Harmony" and "Ventana" flavors. Howerver, the NVIDIA Harmony device support is being deprecated and will be moving to a community-supported stack.