@Narayan
AFAIK or AFAIR you can always add more chip ram via the expansion if only expansions were holdingthe chip ram, and not the fast ram. However, the fast ram is far more wanted and is a favour to do to amiga and it's users to leave the chip ram only as a built in ram or up to 2 Mb to keep it all clean and tidy, and produce fast ram as the rest, so everytime you go buying, you plainly take fast. Nothing more nothing less.
Not true.
You can not have more than 2MB chip memory. The maximum depends on the chipset not, not the OS. The OS could easily be hacked to see even 8MB (which you can see with UAE).
Even when the CPU would be able to address more than 2MB, the custom chipsets cannot. UAE >2MB hack is possible since they have full control of the chipset emulation, and the emulated chipset can easily be modified to support larger memory map.
@JuvUK
having 4 mb would be cool
Won't ever be possible with real Amiga.