Support to specify build time OS target

Now run:

make PX4_TARGET_OS=nuttx

or

make PX4_TARGET_OS=linux

To test the linux build and make sure that the required directories
exist, run:

make linuxrun

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Makefile

@@ -143,7 +143,7 @@ testbuild:
 	$(Q) (cd $(PX4_BASE) && $(MAKE) distclean && $(MAKE) archives && $(MAKE) -j8)
 	$(Q) (zip -r Firmware.zip $(PX4_BASE)/Images)
 
-testrun:
+linuxrun:
 	Tools/linux_run.sh
 
 #

Tools/linux_run.sh

@@ -3,7 +3,7 @@
 if [ ! -c /tmp/ttyS0 ] || [ ! -c /tmp/ttyS1 ]
 	then
 	echo "Need to create /tmp/ttyS[01]"
-	echo "socat PTY,link=/tmp/ttyS0 PTY,link=/tmp/ttyS1"
+	echo "sudo socat PTY,link=/tmp/ttyS0 PTY,link=/tmp/ttyS1"
 	exit 1
 fi
 
@@ -12,6 +12,15 @@ if [ ! -d /fs/msdcard ] && [ ! -w /fs/msdcard ]
 	echo "Need to create/mount writable /fs/microsd"
 	echo "sudo mkdir -p /fs/msdcard"
 	echo "sudo chmod 777 /fs/msdcard"
+	exit 1
+fi
+
+if [ ! -d /eeprom ] && [ ! -w /eeprom ]
+	then
+	echo "Need to create/mount writable /eeprom"
+	echo "sudo mkdir -p /eeprom"
+	echo "sudo chmod 777 /eeprom"
+	exit 1
 fi
 
-Build/linux_default.build/mainapp
+Build/linux_default.build/mainapp linux-config/linuxtest/init/rc.S

makefiles/setup.mk

@@ -33,8 +33,11 @@
 # Path and tool setup
 #
 
-#export PX4_TARGET_OS	 = nuttx
+ifdef ($(PX4_TARGET_OS),nuttx)
+export PX4_TARGET_OS	 = nuttx
+else
 export PX4_TARGET_OS	 = linux
+endif
 
 #
 # Some useful paths.