Mantis: save mission in RAM

This is using a reduced number of mission items of 1000 instead of 2000
in order to fit in RAM.

boards/atl/mantis-edu/init/rc.board_defaults

@@ -20,7 +20,10 @@ param set-default EV_TSK_STAT_DIS 1
 
 set LOGGER_ARGS "-m mavlink"
 
-# Start esc
+# Save missions RAM
+set DATAMAN_ARGS "-r"
+
+# Start ESC already here, so that we have beeps.
 tap_esc start -d /dev/ttyS4 -n 4
 
 # Transition from previous non open-source flight stack

boards/atl/mantis-edu/src/board_config.h

@@ -59,6 +59,7 @@
 #define BOARD_ARMED_STATE_LED  LED_BLUE
 
 #define FLASH_BASED_PARAMS
+#define RAM_BASED_MISSIONS
 
 /*
  * ADC channels

src/modules/navigator/navigation.h

@@ -48,6 +48,8 @@
 #  define NUM_MISSIONS_SUPPORTED 50
 #elif defined(__PX4_POSIX)
 #  define NUM_MISSIONS_SUPPORTED (UINT16_MAX-1) // This is allocated as needed.
+#elif defined(RAM_BASED_MISSIONS)
+#  define NUM_MISSIONS_SUPPORTED 500
 #else
 #  define NUM_MISSIONS_SUPPORTED 500
 #endif