The aty128fb ATI Rage 128 framebuffer driver doesn't compile in 2.5.47 because it has not been ported to the new fbdev API. These changes are in the linuxppc tree, but have not been merged into mainline.
This is at least partially a dupe of bug 32.
Fixed in 2.5.51 ?
This now compiles in 2.5.51
Changed category to Drivers.