[syslinux] mysteries of memdisk code

[H. Peter Anvin]

Loginov Alexander wrote:
> 
> 1)       _binary_memdisk_bin_start[], _binary_memdisk_bin_end[] and
> _binary_memdisk_bin_size[]; These variables are declared (as extern
> const chat in 'setup.c') but never defined in the code. Yet, it seems
> that somehow they are initialized with the size and start address of
> memdisk. How can it be?
> 

GNU ld can convert a binary file to an object file (.o), and then it 
automatically create those symbols assuming that the original file was 
named memdisk.bin.
	
	-hpa