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For security, u-boot shell needs to be disabled. Setting the
CONFIG_BOOTDELAY to -2 will disable the prompt for entering into shell.
-1 will skip executing the commands.
>=0 will prompt to enter shell.
-2 will skip the prompt.
https://github.com/u-boot/u-boot/blob/51aef405550e603ff702c034f0e2cd0f15bdf2bb/common/autoboot.c#L479
Making it configurable through DISTRO_FEATURES.
Add "disable-u-boot-shell" to DISTRO_FEATURES for this feature.
Signed-off-by: Vivekanand Veeracholan <vveerach@google.com>
Change-Id: I1b1e1a6c2552335b13fb3f1a9561d08f3a0e8f94
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