Barebox
Barebox is an attempt to work around the limitations that U-Boot shows through its age. Originally dubbed U-Boot v2, it now has a different name because its design goals are different.
Barebox now support support arm, powerpc, mips, nios2, blackfin, x86
U-Boot-v2 Presentation from CELF Embedded Linux Conference Europe Grenoble, 2009-10-16 (pdf)