[U-Boot] trigger automatic update (FIT image) from prompt instead of "updatefile" env variable

[Wolfgang Denk]

Dear Andreas Pretzsch,

In message <1302554333.13241.158.camel at ws-apr.office.loc> you wrote:
> Is there a way to manually trigger an automatic update using a FIT
> image, based on the way described in doc/README.update ?

Yes, there is.

> I mean beside setting "updatefile" environment variable, saveenv and
> reboot, but trigger it from U-Boot prompt resp. script ?
> 
> As far as I can see, update_tftp() is only called once during the
> startup, but not referenced by any command.

It requires a two-step approach.  In the first step, implement such a
command - patches welcome :-)

Best regards,

Wolfgang Denk

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