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The value of the `boot_arg1` variable when the OS was started can be read via xref:configuration.adoc#part4[device-tree] at `/proc/device-tree/chosen/bootloader/arg1`
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==== `boot_count`
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Raspberry Pi 5 and newer flagship devices only.
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Raspberry Pi 5 and newer devices only.
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The `boot_count` variable is an 8-bit value stored in a reset-safe register that is incremented at boot (wrapping back to zero at 256). It is cleared if power is disconnected.
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