u-boot factory reset

u-boot factory reset

[Damien LEFEVRE]

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Hi,

First time customizing u-boot, forgive my basic question.

To implement a factory reset, my initramfs expects a ‘factoryreset’ kernel
parameter to format an overlay FS partition before mounting it.

The target machine is a Tegra TX2.

I’m able to use the Volume Up button for factory reset, which is gpio-313 .
When starting the board if I press the button say 5s, I’d like to add the
‘factoryreset’ parameter to the boot parameters

I think I could use this syntax @uboot_var('factoryreset') in the
KERNEL_ROOTSPEC variable and have the variable set either to '' or
'factoryreset'

Maybe, I should append distro_bootcmd to add the gpio pin reading to
set factoryreset variable before proceeding with the boot sequence.

But how can I add the variable and have it set if the if the gpio pin is at
a certain state?

Thanks,

-Damien

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