1. In device/fsl/imx6/sabresd/vold.fstab, change
dev_mount udisk /mnt/udisk auto /devices/platform/fsl-ehci.0/usb1
to
dev_mount udisk /mnt/udisk auto /devices/platform/fsl-ehci.0/usb1/1-1/1-1.4
dev_mount udisk1 /mnt/udisk1 auto /devices/platform/fsl-ehci.0/usb1/1-1/1-1.1
1-1 is usb hub device name in sysfs, 1-1.4 and 1-1.1 is usb hub port number in sysfs. You can get this number from kernel log when insert usb hub and usb disk.
2. In device/fsl/imx6/sabresd/overlay/frameworks/base/core/res/res/xml/storage_list.xm, add below code before </StorageList>.
<storage android:mountPoint="/mnt/udisk1"
android:storageDescription="@string/storage_usb"
android:primary="false"
android:removable="true" />
3. Apply below patch in device/fsl/imx6/etc/init.rc
diff --git a/imx6/etc/init.rc b/imx6/etc/init.rc
index b33b654..397b809
--- a/imx6/etc/init.rc
+++ b/imx6/etc/init.rc
@@ -24,7 +24,7 @@ loglevel 3
export LOOP_MOUNTPOINT /mnt/obb
export SHM_MOUNTPOINT /mnt/shm
export EXTERNAL_STORAGE /mnt/sdcard
- export SECONDARY_STORAGE /mnt/extsd:/mnt/udisk
+ export SECONDARY_STORAGE /mnt/extsd:/mnt/udisk:/mnt/udisk1
export BOOTCLASSPATH /system/framework/core.jar:/system/framework/core-junit.jar:/system/framework/bouncycastle.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/
export LIGHTSENSOR_PATH /sys/class/i2c-adapter/i2c-1/1-0044
@@ -55,6 +55,8 @@ loglevel 3
symlink /mnt/extsd /extsd
mkdir /mnt/udisk 0000 system system
symlink /mnt/udisk /udisk
+ mkdir /mnt/udisk1 0000 system system
+ symlink /mnt/udisk1 /udisk1
mkdir /system
mkdir /data 0771 system system
mkdir /cache 0770 system cache
