................ Lite5200_config \ Lite5200_LOWBOOT_config \ Lite5200_LOWBOOT08_config \ icecube_5200_config \ icecube_5200_LOWBOOT_config \ icecube_5200_LOWBOOT08_config \ icecube_5200_DDR_config \ icecube_5200_DDR_LOWBOOT_config \ icecube_5200_DDR_LOWBOOT08_config \ icecube_5100_config: unconfig .........

above are from Makefile of u-boot-1.1.3,we can see that icecube_5100_config: unconfig what's the meaning of "unconfig"

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