On Fri, Sep 16, 2011 at 11:00:12AM +0530, Girish K S wrote: > Hello Aaron Lu, Hi, > please check the mmc 4.5 specification CMD21 is > tuning command. So you are using a mmc card with a sd host? -Aaron -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html