None of the images of Linaro starting from 14.06 is booting on my juno board

Hello all i'm trying to boot android on my juno board. i followed the procedure described here http://releases.linaro.org/latest/android/armv8-android-juno-lsk and also here Setting up Android on Juno

and none of them worked for me. each time i'm getting the same error.

[   49.344275] fs_mgr: Failed to mount an un-encryptable or wiped partition on/dev/block/sda2 at /system options: (null) error: No such file or directory

[   49.357645] init: fs_mgr_mount_all returned an error

this means that kernel is not able to mount the /system partition.

when i checked the logs on the video posted in this page i noticed that kernel is recognizing only 1 usb port instead of 4.

i tried using different USB sticks and different linaro images starting from 14.06 till the latest and i still have the same problem.

when searching i hit this conversation on linaro irc https://irclogs.linaro.org/2014/07/18/%23linaro-android.txt but there was no solution.

you can find attached the logs of the kernel boot.

Can you please enlighten me.

thank you very much in advance for your help