CONFIG_FEATURE_DEVFS
Enable if you want BusyBox to work with devfs.
+Enable devfs support
+CONFIG_FEATURE_DEVPTS
+ Enable if you want BusyBox to use Unix98 PTY support. If enabled,
+ busybox will use /dev/ptmx for the master side of the pseudoterminal
+ and /dev/pts/<number> for the slave side. Otherwise, BSD style
+ /dev/ttyp<number> will be used. To use this option, you should have
+ devpts or devfs mounted.
+
Clean up all memory before exiting
CONFIG_FEATURE_CLEAN_UP
As a size optimization, busybox by default does not cleanup memory