first commit

external/packages/bsp/rk356x/etc/profile.d/usbdevice.sh

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+#!/bin/sh
+
+# The env variables below can be overridden
+
+# option: adb acm hid mtp ntb rndis uac1 uac2 ums uvc
+export USB_FUNCS="adb"
+
+export UMS_FILE=/userdata/ums_shared.img
+export UMS_SIZE=256M
+export UMS_FSTYPE=vfat
+export UMS_MOUNT=0
+export UMS_MOUNTPOINT=/mnt/ums
+export UMS_RO=0