[U-Boot] SPL Dfu update

[Tom Rini]

On Wed, Oct 30, 2013 at 08:58:14PM +0100, Wolfgang Denk wrote:
> Dear Michael Trimarchi,
> 
> In message <CAOf5uw=1yvf8xde--7bP2y0joPhj9WcEhE8jS8Y05+WYZ_wGBQ at mail.gmail.com> you wrote:
> > 
> > > Apart of the fact that is possible to add DFU to SPL, I am missing which
> > > is the real advantage. One goal of having split U-Boot into two images
> > > (SPL and U-Boot) is also to get a simpler and smaller image, letting the
> > > main U-Boot image doing the rest (hush shell, further drivers, and so
> > > on). We are now trying to push features that we currently have into SPL.
> > > Well, why cannot we simply run U-Boot if we need a DFU update ? Which
> > > are the real advantages for having DFU in SPL ?
> > 
> > USB flashing (no serial, no display) only otg
> 
> This does not answer Stefano's question: why do it in SPL, what's
> wrong with loading the real U-Boot for this purpose?

The answer, of debatable value, is that we can't download the whole
thing at once to the target device.  One could wrap the logic and load
SPL, then load special task U-Boot, at least in the examples I know well
enough to talk about them (the TI parts).

-- 
Tom
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