It seems like you would have two choices. You could display the message sooner by creating a script and making sure it run very early in the boot process. The other choice that would display it very soon would be to add some code to u-boot that displays the message. Of course, that's going to probably risk bricking your device, and I don't even know if u-boot would support i2c on the Edison, but that should allow you to bring it up right away.
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