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In message OFE8693F4B.1B31392F-ON6525707E.002A1DF5-6525707E.002BE3EE@tcs.com you wrote:

What is the significance of Load address and Entry point?

The load address is where your uncompressed kernel gets loaded (copied) to, and the entry point address is, umm, well, it's the kernel's entry point address.

Can I choose A1, A2, A3 arbitrarily? Is there any dependency on ARM/PPC/MIPS architecture on the address A1, A2, A3?

No, you cannot chose these addresses arbitrarily. They must match your architecture, your board's memory map and your kernel configuration.

BTW: allthis has been discussed many times before on this list; it would have been a good idea to search a bit in the archives.

What is the justification of saying "This is bound to fail on ARM" for load address =0 and entry point =0?

ARM has usually ROM at address 0; you will not be able to copy your kernel to this address; the following jump to this address provokes undefined behaviour.

Best regards,

Wolfgang Denk