busybox-initramfs: copy SYSTEM to RAM before mounting. this new feature can be deactivated with the 'noram' option to the bootloaderconfig or is not avaible if to avaible total memory (1024000 Kb on normal systems, 364544 Kb for RaspberryPi) is to low.

Signed-off-by: Stephan Raue <stephan@openelec.tv>

packages/initramfs/sysutils/busybox-initramfs/scripts/init

@@ -81,6 +81,9 @@ NBD_DEVS="0"
       nosplash)
         SPLASH=no
         ;;
+      noram)
+        SYSTEM_TORAM=no
+        ;;
       overlay)
         OVERLAY=yes
         ;;
@@ -458,7 +461,20 @@ NBD_DEVS="0"
 
     if [ -f "/flash/$IMAGE_SYSTEM" ]; then
     # /flash is filesystem with system image file
-      mount_part "/flash/$IMAGE_SYSTEM" "/sysroot" "ro,loop"
+      INSTALLED_MEMORY=`cat /proc/meminfo | grep 'MemTotal:' | awk '{print $2}'`
+      SYSTEM_TORAM_LIMIT=1024000
+
+      if [ -f "/etc/initramfs.conf" ]; then
+        . /etc/initramfs.conf
+      fi
+
+      if [ "$SYSTEM_TORAM" = "no" -o "$INSTALLED_MEMORY" -lt "$SYSTEM_TORAM_LIMIT" ]; then
+        mount_part "/flash/$IMAGE_SYSTEM" "/sysroot" "ro,loop"
+      else
+        cp /flash/$IMAGE_SYSTEM /dev/$IMAGE_SYSTEM
+        mount_part "/dev/$IMAGE_SYSTEM" "/sysroot" "ro,loop"
+      fi
+
       /bin/busybox mount --move /flash /sysroot/flash
     else
     # /flash is actual root filesystem