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When creating a minimal config or creating a hard baseline for incremental changes, it is often desired to disable all kernel options and then begin building and enabling only what is required. To support this workflow, a new variable KCONFIG_MODE is introduced to contain a hint to the kernel configuration about how the kernel config should be produced. This variable is passed directly to lkc when it is invoked during configuration, so the contents of the variable must be a valid option for the kernel config build. Additionally, when a defconfig is detected, allnoconfig is enabled as the default operation, unless otherwise specified by KCONFIG_MODE. (From OE-Core rev: 644f2e525b910b9ff8d9aaa33f11eba3fefa7c85) Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>