[U-Boot] stopping u-boot from booting an old image in RAM.

[Thompson, Nick (GE EntSol, Intelligent Platforms)]

> -----Original Message-----
> From: u-boot-bounces at lists.denx.de [mailto:u-boot-bounces at lists.denx.de] On Behalf Of David Collier
> Sent: 21 October 2009 16:08
> To: u-boot at lists.denx.de
> Subject: [U-Boot] stopping u-boot from booting an old image in RAM.
> 
> If I boot this unit, then remove the SD card it booted from and reset it,
> it happily boots some Linux image which is lying around in memory.
> 
> It even does it after a short power-off power-on sequence.
> 
> I think that's horrible behaviour.
> 
> I was told I could use && instead of ; between the commands in the
> bootcmd string to stop this, but that barfed, and then I was told that
> maybe && only existed if "scripting is enabled"
> 
> Could anyone please talk me through the steps of either
> 
> 1. doing what it takes to enable this && feature, so that if it fails to
> find the card, it doesn't go on and try to boot.
> 
> or
> 
> 2. something else that will do it, such as so effectively buggering up an
> image that has been booted from that it will never be re-used
> 
>  :-)
> 
> TVM
> 
> David Collier

Probably a simple mw (memory write) to the entry point of linux, before
You attempt to reload the image, would do the trick?

Usage:
mw [.b, .w, .l] address value [count]

Nick.