[U-Boot-Users] Newbie question

[Frank Young]

The is not a u-boot question but a question about u-boot source code.

In file cpu/ppc4xx/start.S, the first line for 405GP is:
addi r4, r0, 0x0000

I think the purpose of this line is to set r4 as 0x0000, but where is r0 
set? Is it supposed to be 0 when the code is started?

Also, why not simply use li r4, 0x0000. Any difference?

Thanks!

Frank

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