[U-Boot] Two U-Boot versions on same device

[Rishi Dhupar]

The size differences are substantial.  170 K for the regular uboot binary
and about 1.1 MB for the uboot binary with diagnostic software.

On Fri, Mar 5, 2010 at 7:31 AM, Matthias Kaehlcke <matthias at kaehlcke.net>wrote:

> El Fri, Mar 05, 2010 at 07:09:11AM -0500 Rishi Dhupar ha dit:
>
> > Strange question but I am using an OMAP 3530 and the boot process
> currently
> > is from TI's X-Loader to U-Boot to Linux.
> >
> > What I want is to have two different versions of U-Boot, an extremely
> > optimized and small one (to reduce boot time) but then also a debug
> version
> > that has a built in device test suite and allows updating of the Linux
> > kernel.
> >
> > The optimized version would boot first and then check if a GPIO is set,
> if
> > so then it would boot into the debug U-Boot to perform tests or software
> > updates.
> >
> > Anyone do anything like this or is it even possible?
>
> i think it should be possible, but i wonder if you really need
> this. do you have hard data that suggest that the test suite or
> allowing to update the linux slows down U-Boot significantly?
>
> in my environment i use scripts stored in environment variables to
> update the kernel and the rootfs, afaik this doesn't add any overhead
> at all.
> the test suite you mentioned might be a different issue depending on
> its size, as it has to be copied from flash to RAM at boot time. if
> it's just adds a few kB i think it shouldn't be relevant, especially
> on your high-profile system
>
> best regards
>
> --
> Matthias Kaehlcke
> Embedded Linux Developer
> Barcelona
>
>      There is no passion to be found playing small - in settling
>    for a life that is less than the one you are capable of living
>                       (Nelson Mandela)
>                                                                 .''`.
>    using free software / Debian GNU/Linux | http://debian.org  : :'  :
>                                                                `. `'`
> gpg --keyserver pgp.mit.edu --recv-keys 47D8E5D4                  `-
>