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When CONFIG_LOG is activated, if LOG_DEBUG is defined in a file and DEBUG is not defined the trace with debug() macro are not displayed, because the parameter cond : _DEBUG = 0 is checked in debug_cond(). With this patch the define DEBUG, used to force the trace generated by debug() macro, is linked with the define LOG_DEBUG, used to force the trace generated by other macros (log_debug, dev_dbg, pr_debug). We only need to define LOG_DEBUG in a file to activate all the traces generated by any U-Boot debug macro, as it is described in /doc/develop/logging.rst Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>