Specify length of memory block via command line

[PRASANTH RAJAGOPAL <prasanthris@xxxxxxxxx>]

How can I specify the length of a Memory Block over command line - for
the GCC Linker?

For example , I have a Memory block defined in script:  MEM_L1_CODE :
ORIGIN = 0xFFA00000, LENGTH = 0x4000

I would like to change the length of this block alone, without
touching the script. Is there a way?

Thanks