initial brax3 device makefiles

* boots and works fine

Signed-off-by: erascape <erascape@proton.me>

overlay/system/etc/umtprd/umtprd.conf

@@ -0,0 +1,46 @@
+#
+# uMTP Responder config file
+#
+
+# UBports: Don't show hidden files
+show_hidden_files 0
+
+# UBports: Use phablet user as default for all storage file operations
+default_uid 32011
+default_gid 32011
+
+# Add home folder as default "internal storage" entry
+storage "/home/phablet" "Internal Storage" "rw,locked"
+
+# Set the USB strings visible to host systems
+manufacturer "BraX"
+product "BraX3"
+# FIXME: set to something proper!
+serial "UT2004"
+
+# Set the MTP firmware version
+firmware_version "Rev A"
+
+# Set the USB interface string. Should be always "MTP"
+interface "MTP"
+
+# Set the USB Vendor ID, Product ID and class
+# FIXME: set to something proper!
+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
+
+# Generic FunctionFS Mode
+usb_functionfs_mode 0x1
+
+usb_dev_path   "/dev/usb-ffs/mtp/ep0"
+usb_epin_path  "/dev/usb-ffs/mtp/ep1"
+usb_epout_path "/dev/usb-ffs/mtp/ep2"
+usb_epint_path "/dev/usb-ffs/mtp/ep3"
+
+usb_max_packet_size 0x200