Store the configuration on the SD card

log.h

@@ -12,6 +12,7 @@ void log_put_uint(unsigned int i);
 void log_put_float(float f);
 void log_put_header(unsigned int timestamp);
 void log_put_array(char *data, int length);
+void log_put_config(void);
 
 void log_mark_busy(void);
 void log_mark_idle(void);
@@ -19,6 +20,7 @@ unsigned int log_read_busytime(void);
 
 /* Needed by log.c and sdcard.c only */
 #define LOG_MAGIC 0x00000CFC
+#define LOG_MAGIC_CONFIG 0x00C07F18
 
 #define LOG_BUFFERSIZE 4096