Appendices : Advanced Boot and Backup Configuration : Changing the boot image in U-Boot monitor mode

Changing the boot image in U-Boot monitor mode
You can access U-Boot monitor mode in one of the following two ways:
During boot, when the Hit any key to stop autoboot prompt appears, pressing any key before the timer expires brings the OnBoard appliance to U-Boot monitor mode.
The U-Boot hw_boot command boots from either the first or second image according to the value of the currentimage environment variable. You can use the following procedures to change which image is used for booting.
To boot in U-Boot monitor mode:
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During boot, when the Hit any key to stop autoboot prompt appears, press any key before the time elapses to stop the boot. The U-Boot monitor prompt appears.
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To boot from an alternate image in U-Boot monitor mode:
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For example, to boot from image2 enter the number 2, as shown in the following screen example.
=> setenv currentimage 2
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To boot in single user mode from U-Boot monitor mode:
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The single-user # prompt appears, as shown in the following example.