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

[Wolfgang Denk <wd@denx.de>]

Dear Kumar,

in message <460D947F-9265-409E-A2E7-F079C52542CF@kernel.crashing.org> you wrote:
> 
> > 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.
> 
> So I'm not sure I completely understand what this state machine would  
> look like that you are thinking about.

It would describe legal state changes - each sub-command would only be
allowed in a certain set of states, and if run cause a transition into
another state.

> I get the issue, just not seeing the implementation you are thinking  
> about.

He, implementation. The details are left to the reader :-)

Sorry, I'm not even thinking about any actual code yet.

Best regards,

Wolfgang Denk

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