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

[Matthias Kaehlcke <matthias@kaehlcke.net>]

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

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