I'm working on a CC Wi-i.MX53 board. How can I config the uSD card in the system instead of SD card as storage media?

Embedded Devices
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Hello, It seems you are talking about the Android OS on the CCWi-i.MX53? If it is,Please contact Digi technical support at tech.support@digi.com, they can provide you the application note regarding , how to mount Micro SD card On Android 2.3 CCWi-i.MX53 device.

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Thank you very much cpigilam for your answer. I will be in contact with Digi technical support then. Thank you again.

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These are the instructions to modify the default behavior on Android to mount by default the microSD instead of a SD card.

You must modify the file ‘vold.fstab’, you can find in the rootfs at /system/etc

After the changes, the microSD is mounted under /mnt/sdcard and SD is mounted under /mnt/extsd.
This way, default Android applications (such as Gallery) will consider the uSD as the default external storage.

ORIGINAL FILE CONTENT:
dev_mount sdcard /mnt/sdcard auto /devices/platform/mxsdhci.1/mmc_host/mmc0
dev_mount extsd /mnt/extsd auto /devices/platform/mxsdhci.2/mmc_host/mmc1
dev_mount udisk /mnt/udisk auto /devices/platform/fsl-ehci.1/usb

MODIFIED FILE CONTENT:
dev_mount sdcard /mnt/extsd auto /devices/platform/mxsdhci.1/mmc_host/mmc0
dev_mount extsd /mnt/sdcard auto /devices/platform/mxsdhci.2/mmc_host/mmc1
dev_mount udisk /mnt/udisk auto /devices/platform/fsl-ehci.1/usb