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| If your USB hub has a card reader, it can mess up device numbering which are important during boot. Currently I don't have my OPi at hand, so if you know how, you might play with boot.scr a bit. Important paramters are:
 boot=/dev/mmcblk0p1 disk=/dev/mmcblk0p2
 
 Instead of dev, it could also be set with LABEL or UUID, like
 boot=LABEL=label1 disk=LABEL=label2
 
 That way, it doesn't matter how much card readers you have connected during boot.
 
 
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