Linux 3.0 XIP kernel size is much bigger than 2.6, adding zeros at the end?

By enabling CONFIG_XIP_KERNEL in the .config and built the xipImage file. Found the size is over 16MB. Tried with Kernel 2.6, and it is only 6MB.

Looking into the kernel image and found after the data ends, it adds huge zeros at the end.

Anybody knows why?

Thanks,

Philip