@Wizzard are you sure that there is uboot on your sdcard ?
As far as i remember with pcm720 uboot on spi to boot from sdcard you'd have to destroy uboot on sd...
Make a new sdcard of whatever OS you want and try again.
As far as i remember with pcm720 uboot on spi to boot from sdcard you'd have to destroy uboot on sd...
Make a new sdcard of whatever OS you want and try again.