19
ODROID XU4 USER MANUAL
Development boards such as the XU4, by deinition, will at some point
either require an OS upgrade or a simple relash to revert to a known
good base state. The following section describes lashing the media.
USB microSD card adapter
No matter which boot media you select for your XU4, you will
need an additional device to perform the lashing process, which is
called a USB SD card reader / writer. It should be compatible with
your host desktop or laptop (lashing computer) and with the OS run
-
ning on it. The image above shows a typical microSD card adapter.
If you recall in the previous section, we recommended the placement
of a USB3 hub close to your free work area. This hub, if present, is
where you would connect the USB SD card reader / writer.
Now, you may see the point of the suggested hub location - basical-
ly, it allows for frequent lashing of the boot media and its convenient
attachment to the XU4. If all points in the connection are USB3 type,
you will get the fastest possible read / write speeds. USB2 compati-
bility will allow one or more points to be of type USB2, but will result in
slower speeds.
Start using the designated non-conductive free work area for
all subsequent activities. In the microSD receptacle of the USB SD
card reader / writer, look for the metal contact pins. Then, if you
are using a microSD card to lash the image, align the metal strips
of the microSD card to make contact with the pins. Insert the mi-
croSD card into the USB SD card reader / writer. The image below
indicates the alignment when using the Transcend USB3 microSD
card reader / writer model. The alignment may be different with
your reader / writer model.
However, if you are using an eMMC module to lash the image,
you irst need to attach the eMMC module to the eMMC/microSD USB
adapter. Place the eMMC module and the adapter such that the 34
pin female/male connectors overlap and gently press them together.
Align the metal strips of the microSD adapter to make contact with the
pins in the microSD receptacle of the USB SD card reader / writer. In-
sert the assembly by pressing irmly on the eMMC module until it clicks
into place.
Chapter 2