Added installer variables for audio and camera module, Re-added gpu_mem installer variable

Author: Phiber2000

README.md

@@ -165,6 +165,11 @@ The format of the _installer-config.txt_ file and the current defaults:
                               # undesirable.
     enable_watchdog=0         # loads up the hardware watchdog module and configures systemd to use it. Set to
                               # "1" to enable this functionality.
+    gpu_mem=                  # Specifies the amount of RAM in MB that should be reserved for the GPU.
+                              # Minimum is "16". If not defined, the bootloader sets it to 64MB.
+    sound_enable=0            # Set to "1" to enable the onboard audio.
+    camera_enable=0           # Set to "1" to enable the camera module. This sets all needed parameters in config.txt.
+    camera_disable_led=0      # Disables the camera led. The option `camera_enable=1` has to be set to take effect.
 
 The timeserver parameter is only used during installation for _rdate_ which is used as fallback when setting the time with `ntpdate` fails.  
 

scripts/etc/init.d/rcS

@@ -41,6 +41,9 @@ final_action=reboot
 hwrng_support=1
 enable_watchdog=0
 gpu_mem=
+sound_enable=0
+camera_enable=0
+camera_disable_led=0
 
 # these shouldn't really be changed unless auto-detection fails
 bootdev=/dev/mmcblk0
@@ -519,8 +522,10 @@ echo "  rootfs_mkfs_options = $rootfs_mkfs_options"
 echo "  rootfs_install_mount_options = $rootfs_install_mount_options"
 echo "  rootfs_mount_options = $rootfs_mount_options"
 echo "  final_action = $final_action"
-echo "  hardware_versions = $hardware_versions"
 echo "  gpu_mem = $gpu_mem"
+echo "  sound_enable = $sound_enable"
+echo "  camera_enable = $camera_enable"
+echo "  camera_disable_led = $camera_disable_led"
 echo
 
 echo -n "Waiting 5 seconds"
@@ -1014,6 +1019,27 @@ echo -n "Creating default cmdline.txt... "
 echo "$cmdline root=$rootpartition rootfstype=$rootfstype rootwait loglevel=3" > /rootfs/boot/cmdline.txt
 echo "OK"
 
+# enable sound if specified in the configuration file
+if [ "${sound_enable}" = "1" ] ; then
+    sed -i "s/^#\(dtparam=audio=on\)/\1/" config.txt
+fi
+
+# enable camera if specified in the configuration file
+if [ "${camera_enable}" = "1" ] ; then
+    if [ "${gpu_mem}" -lt "128" ] ; then
+        gpu_mem=128
+    fi
+    echo "start_x=1" >> /rootfs/boot/config.txt
+    if [ "${camera_disable_led}" = "1" ] ; then
+        echo "disable_camera_led=1" >> /rootfs/boot/config.txt
+    fi
+fi
+
+# set gpu_mem if specified in the configuration file
+if [ -n "${gpu_mem}" ] ; then
+    echo "gpu_mem=${gpu_mem}" >> /rootfs/boot/config.txt
+fi
+
 # run post install script if exists
 if [ -e /bootfs/post-install.txt ]; then
     echo "================================================="