BTRFS file system for MAIN and rootfs partition (#65)

* BTRFS file system for MAIN and rootfs partition

board/miyoo/rootfs/etc/umtprd/umtprd.conf

@@ -0,0 +1,88 @@
+#
+# uMTP Responder config file
+# Must be copied to /etc/umtprd/umtprd.conf
+#
+
+# Loop / daemon mode
+# Set to 1 to don't shutdown uMTPrd when the link is disconnected.
+
+loop_on_disconnect 1
+
+#storage command : Create add a storage entry point. Up to 16 entry points supported
+#Syntax : storage "PATH" "NAME"
+
+storage "/"                     "rootfs" "ro"
+storage "/mnt"                  "MAIN" "rw"
+storage "/boot"                     "BOOT" "ro"
+
+#
+# Uncomment the following line if you want to 
+# override the system default umask value for 
+# the uploaded files.
+#
+
+umask 000
+
+# Set the USB manufacturer string
+
+manufacturer "Miyoo CFW 2.0"
+
+# Set the USB Product string
+
+product "Miyoo Handheld"
+
+# Set the USB Serial number string
+
+serial "01234567"
+
+# Set the USB interface string. Should be always "MTP"
+
+interface "MTP"
+
+# Set the USB Vendor ID, Product ID and class
+
+usb_vendor_id  0x1D6B # Linux Foundation
+usb_product_id 0x0100 # PTP Gadget
+usb_class 0x6         # Image
+usb_subclass 0x1      # Still Imaging device
+usb_protocol 0x1      #
+
+# Device version
+
+usb_dev_version 0x3008
+
+# inotify support
+# If you want disable the events support (beta), uncomment the following line :
+
+# no_inotify 0x1
+
+#
+# Internal buffers size
+#
+
+# Internal default usb_max_rd_buffer_size and usb_max_wr_buffer_size value set to 0x10000.
+# Internal default read_buffer_cache_size value set to 0x100000.
+# Uncomment the following lines to reduce the buffers sizes to fix USB issues on iMX6 based systems.
+
+ usb_max_rd_buffer_size 0x8000      # MAX usb read size. Must be a multiple of 512 and be less than read_buffer_cache_size
+ usb_max_wr_buffer_size 0x8000      # MAX usb write size. Must be a multiple of 512.
+# read_buffer_cache_size 0x8000     # Read file cache buffer. Must be a 2^x value.
+
+#
+# USB gadget device driver path
+#
+
+########################################################################
+#
+# -- Generic FunctionFS Mode --
+#
+########################################################################
+
+usb_functionfs_mode 0x1
+
+usb_dev_path   "/dev/ffs-mtp/ep0"
+usb_epin_path  "/dev/ffs-mtp/ep1"
+usb_epout_path "/dev/ffs-mtp/ep2"
+usb_epint_path "/dev/ffs-mtp/ep3"
+
+usb_max_packet_size 0x200