Without the microSD card inserted, plug in a microUSB-to-USB cable to the USB OTG interface of your Wandboard. Check the lsusb utility on your Linux host to see whether the Wandboard appears as follows:

Bus 002 Device 006: ID 15a2:0054 Freescale Semiconductor, Inc. i.MX6Q SystemOnChip in RecoveryMode

If you don't see this, try a different power supply. It should be 5V, 10W.

Make sure you connect a NULL modem serial cable between the RS232 connector in your Wandboard target and a serial port on your Linux host. Then open a terminal program like minicom with the following:

$ minicom -D /dev/ttyS0 -b 115200

Insert the microSD card image to the module slot, not the base board, as the latter is only used for storage and not for booting, and power it. You should see the U-Boot banner in the minicom session output.

If not, you may have a problem with the serial communication. By default, the Ethernet interface in the FSL community BSP image is configured to request an address by DHCP, so you can use that to connect to the target.

Make sure you have a DHCP server running on the test network where the target is.

You can use a packet sniffer like Wireshark to capture a network trace on your Linux host and filter packages like the bootp protocol. At the least, you should see some broadcasts from your target, and if you use an Ethernet hub, you should also see the DHCP replies.

Optionally, you can log in to your DHCP server and check the logs to see if a new IP address has been assigned. If you see an IP address being assigned, you might want to consider adding an SSH server, like Dropbear, to your core-image-minimal image so that you can establish a network connection with the target. You can do this by adding the following line to the conf/local.conf configuration file:

IMAGE_INSTALL_append = " dropbear"

Note the space after the initial quote.

After building and reprogramming, you can then start an SSH session to the Wandboard from your Linux host with:

$ ssh root@<ip_address>

The connection should automatically log in without a password prompt.

Try to program the default microSD card images from http://www.wandboard.org/index.php/downloads to make sure the hardware and your setup is valid.

Try to reprogram your microSD card. Make sure you are using the correct images for your board (for example, do not mix dual and quad images). Also, try different cards and card readers.