[U-Boot-Users] Extremely tiny footprint

[Amnon Cohen]

If you remove any commands you don't actually need from CONFIG_COMMANDS
you can strip you executable size down a fair bit. But if you need tftp
support,
you won't be able to get down to 32Kb.

Good luck
   Amnon

On 3/2/07, Laurent Pinchart <laurent.pinchart at technotrade.biz> wrote:
>
> Hi Martin,
>
> > > I would like to use U-Boot as a first-stage boot loader to program
> > > flash memory on the target board. The idea is to perform a two-steps
> > > procedure:
> > >
> > > 1. Program the first-stage boot loader in flash using JTAG (slow)
> >
> > There are JTAG programmers, which could work very fast (e. g. BDI2000
> > with workspace enabled). The limiting factor is the flash itself,
> > not the programmer, or the JTAG interface.
> >
> > > 2. The first-stage boot loader downloads the final boot loader
> > > (full-featured U-Boot) using TFTP and writes it to flash (fast)
> > >
> > > To minimize time spent in step one, I need to make the first-stage
> > > boot loader as small as possible (hopefully less than 32kB). Has
> > > anyone ever stripped U-Boot that much ? Is there any documentation
> > > available ?
> >
> > If programming speed is the only reason for your two-step approach,
> > then IMO this is not reasonable. It would be a waste of your time. Use
> > a faster JTAG programmer instead. Or you could buy the flashes
> > preprogrammed.
>
> Buying the flashes preprogrammed is not an option given the quantities.
>
> We already have a BDI2000 which has issues programming the flash using the
> workspace, so it reverts to the slow pure JTAG mode. I still have to
> investigate this directly with Abatron, we haven't found a solution so
> far.
>
> Even using the internal workspace, the BDI2000 is not a very practical
> solution, as it wouldn't be easy to integrate it in our test bench
> architecture. The price is also an issue. This is why I was looking for
> another solution. The alternative I thought of is using a pure JTAG
> programmer (slow) with a tiny ethernet-enabled boot loader. The Freescale
> JTAG commands used to control the processor are not documented, so I can't
> develop a faster JTAG-only alternative. Are you aware of any other
> solution ?
>
> Laurent Pinchart
>
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