U-Boot shell: Difference between revisions
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To disable the press-and-hold method of entering the U-Boot shell, use the following U-Boot commands: | To disable the press-and-hold method of entering the U-Boot shell, use the following U-Boot commands: | ||
<source lang=bash> | <source lang=bash> | ||
env set rstuboot 0 | |||
env save | env save | ||
</source> | </source> | ||
By setting the env var, rstuboot, to a 1, the push-and-hold method can be re-enabled. | By setting the env var, rstuboot, to a 1, the push-and-hold method can be re-enabled. | ||
Latest revision as of 16:28, 18 December 2017
The U-Boot shell is a powerful tool. It allows modification of the environment, as well as the ability to run commands directly. By default, there are two ways to enter the shell: Set the U-Boot jumper, or press and hold the Push Switch before applying power and hold it for 5 seconds. When entering the U-Boot shell, it will attempt to run a script on a USB mass storage device before finally dropping to the shell.
The reset switch is provided as a convenience, so U-Boot can be entered without having to open any kind of enclosure. It can also be disabled for security purposes. Even if the switch is disabled, the U-Boot shell can still be accessed by using the U-Boot jumper.
To disable the press-and-hold method of entering the U-Boot shell, use the following U-Boot commands:
env set rstuboot 0
env save
By setting the env var, rstuboot, to a 1, the push-and-hold method can be re-enabled.