If a file exists in the initramfs at runtime, cpio won't overwrite it by default when extracting the initramfs-extra archive. This adds the -u option to cpio, to overwrite any existing files in the destination. This is meant to fix issues where the -extra archive has an app that is meant to replace a busybox app, busybox --install creates it in the initramfs and gzip will skip it since it's newer than what is in the archive.
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