Dear Michael Trimarchi,
In message <CAOf5uw=hckwpaqogco3kvm1erhs-dvc5brt4usu3uqkettt...@mail.gmail.com>
you wrote:
>
> > This does not answer Stefano's question: why do it in SPL, what's
> > wrong with loading the real U-Boot for this purpose?
>
> Because it's not possible, internal memory size of some cpus. You need
> to have a way to load the second stage and I'm discussing a general
> way to do.
I'm not sure that there are many use cases where you have sufficient
room for all that is needed for DFU (including I/O buffers); and if
you move to RAM early, you have other options as well.
> What is your alternative way?
Depending on your hardware there is a zillion ways to do this. For
low to medium volumes good old JTAG is still a very powerful tool; for
high volumes you will probably just fit pre-programmed NAND on your
board. And of course there is the growing number of systems that can
just boot and install from a SDCard or USB MSD.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
But the only way of discovering the limits of the possible is to
venture a little way past them into the impossible.
- _Profiles of the Future_ (1962; rev. 1973)
``Hazards of Prophecy: The Failure of Imagination''
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