dm 8168 SD卡不支持热拔插 问题
mmcblk0: error -110 sending status comandmmcblk0: error -110 sending read/write command, response 0x0, card status 0x0mm...
mmcblk0: error -110 sending status comandmmcblk0: error -110 sending read/write command, response 0x0, card status 0x0mm...