Couldnot understand a grub manual line..
 

this statement i found in grub manual. what does it mean:


Only kernels loaded at 1 megabyte or above are presently supported. Any attempt to load below that boundary will simply result in immediate failure and an error message reporting the problem

It's bootloader arcana saying where in physical memory the kernel should expect to immediately be loaded. In order to be compatible with GRUB the kernel must be loaded at or above 1 megabyte of physical memory (this location is specified in the ELF or a.out image file of the kernel executable).

If you're not planning to write your own operating system, you don't have to worry about this :).