IBM PowerPC Initialization and Boot Software
['http://git.denx.de/?p=u-boot.git;a=blob;f=arch/powerpc/cpu/ppc4xx/miiphy.c;h=297155fdafa064b955e53e9832de93bfb0cfb85b;hb=9fab4bf4cc077c21e43941866f3f2c196f28670d']