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When we read the docs, we have the feelings that theses variables are boolean ones. So I was setting, for example in my distro.conf file the variable ' ENABLE_I2C = "1" ' to enable I2C. Then I wanted to disable it by simply setting 'ENABLE_I2C' to "0" but it wasn't working. So I noticed that, for example, ' ENABLE_UART ' was checked with ' = "1" ' condition and some other "boolean" was checked against ' -n ' like for ENABLE_I2C. This commit tries to have an uniform behavior for all variables that are shown in the doc under the format ' VARIABLE = "1" ' to enable them and the reader can think they are kind of 'boolean' values. Signed-off-by: Joël Carron <joel.carron@eeproperty.ch>