Hello Michael, On Wed, Oct 30, 2013 at 6:35 PM, Michael Trimarchi <mich...@amarulasolutions.com> wrote: > On Wed, Oct 30, 2013 at 9:11 PM, Wolfgang Denk <w...@denx.de> wrote: >> 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. >> > > No because you need anyway to have a way to load it and dfu is a way. > >>> 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. >> > > I accept the lesson even I don't thing that I need a lesson on it. We > are talking that we have only otg.
I see your user-case and I think I agree with you. > BTW Forget about it. Please don't. I think it is a valuable contribution and I think it is good to have a mechanism which work for your user-case in U-Boot; it is easy to maintain long term and avoid duplication of work in case users has some problem. I got a little bit lost when Tom gave an example where he 'loads' MLO and U-Boot image from OTG; just clarify it for me as it is not clear if it works for you or does not. >From what I understand, your use-case would be: OTG -> SPL -> DFU -> U-Boot Image -> Jump to U-Boot ? -- Otavio Salvador O.S. Systems http://www.ossystems.com.br http://code.ossystems.com.br Mobile: +55 (53) 9981-7854 Mobile: +1 (347) 903-9750 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
