[U-Boot] Multiple binaries built through u-boot source

[Mike Frysinger <vapier@gentoo.org>]

On Tuesday, September 14, 2010 08:40:55 Stefan Roese wrote:
> On Tuesday 14 September 2010 12:21:41 Vipin Kumar wrote:
> > > Take a look at the NAND_SPL infrastructure (nand_spl/*). It was created
> > > for platforms booting from NAND with tight restrictions (e.g. 4k image
> > > size for inital setup, mostly DDR). General idea here is that 2 images
> > > are created:
> > > 
> > > a) Very small SPL (secondary program loader) image with only basic
> > > 
> > >    setup, like DDR and NAND
> > > 
> > > b) RAM based U-Boot image
> > > 
> > > Both images are combined in the build process creating a single image
> > > that can be flashed into NAND.
> > > 
> > > doc/README.nand-boot-ppc440 might be interesting to get some more infos
> > > about this, some of it PPC4xx specific though.
> > 
> > Yes, got it. The only point is that this is meant to boot from NAND,
> > ONENAND devices(As the name suggests). Can there be a generic interface
> > independent of a particular device.
> > 
> > Offcourse I agree that execute in place would work for NOR devices and we
> > wont need this kinda solution but still a generic solution for both types
> > of devices is preferable
> 
> Sure, a more generic approach would be better. But I suspect that this is
> not so easy to do. Those tight image-size restrictions of the IPL/SPL
> loaders will make such generalisation efforts quite difficult.

there should at least be a build system unification if the general source code 
isnt possible.  all Blackfin builds now (LDRs) have a dedicated binary to 
initialize memory before any of u-boot is loaded.  this is the "initcode" 
stuff in the blackfin cpu dir.
-mike
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