[U-Boot] [RFC] bootm: Add sub commands

[Wolfgang Denk <wd@denx.de>]

Dear Kumar Gala,

In message <CF82B92D-9821-495A-AA5A-192B83C8619E@kernel.crashing.org> you wrote:
>
> >> +	if (!images.valid) {
> >> +		printf("Need to call %s start first\n", argv[0]);
> >> +		return 1;
> >> +	}
> >
> > We should probably set up a small state machine.
> 
> A small state machine for what?

Well, we have states - here you code that a certain operation is  not
allowed   unless   something  else  has  been  done  before.  SImilar
dependencies may follow - after uncompressing and loading the  kernel
image  it  might  for  example  be  not  allowed  any more to turn on
interrupts, etc. Of course we can  handle  all  this  in  a  maze  of
conditional statements. Or we could use a small state machine.

Best regards,

Wolfgang Denk

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