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+README.md for sub/busybox
+-------------------------
+
+host-full-config and host-mdev-config are two different
+configuration files for busybox, which is actually built
+twice during the bootstrap:
+
+- host-full-config is the "full" configuration for busybox, i.e.
+it instructs the build process to build a busybox binary that
+contains all the basic commands our host will need: coreutils,
+modprobe, ifconfig, mdev, etc. That's the binary that will be
+installed in /opt/busybox and linked in /bin.
+
+- host-mdev-config is "mdev-only". It instructs the build process
+to build a busybox binary that contains *only* the mdev command
+and its dependencies. That one will be copied into the initramfs:
+the initramfs uses "mdev" and "mdev -s" commands, this is necessary
+for coldplugging devices at boot. We don't need busybox to provide
+any other commands in the initramfs because all the rest is done by
+skarnet.org binaries.