如题，下面是我插入USB2.0 U盘时的信息，
[root@FriendlyARM /]# [ 29.720637] usb 1-1: new high speed USB device using s5p-ehci and address 2
[ 29.841742] usb 1-1: device descriptor read/64, error -71
[ 30.068289] usb 1-1: device descriptor read/64, error -71
[ 30.283134] usb 1-1: new high speed USB device using s5p-ehci and address 3
[ 30.404197] usb 1-1: device descriptor read/64, error -71
[ 30.630786] usb 1-1: device descriptor read/64, error -71
[ 30.845626] usb 1-1: new high speed USB device using s5p-ehci and address 4
[ 31.267504] usb 1-1: device not accepting address 4, error -71
[ 31.376876] usb 1-1: new high speed USB device using s5p-ehci and address 5
[ 31.798738] usb 1-1: device not accepting address 5, error -71
[ 31.798815] hub 1-0:1.0: unable to enumerate USB device on port 1
[ 32.185479] usb 2-1: new full speed USB device using s5p-ohci and address 2
[ 32.332698] usb 2-1: not running at top speed; connect to a high speed hub
[ 32.344712] usb 2-1: New USB device found, idVendor=05e3, idProduct=0727
[ 32.344775] usb 2-1: New USB device strings: Mfr=3, Product=4, SerialNumber=2
[ 32.344840] usb 2-1: Product: USB Storage
[ 32.344876] usb 2-1: Manufacturer: Generic
[ 32.344914] usb 2-1: SerialNumber: 000000000207
[ 32.358722] scsi0 : usb-storage 2-1:1.0
[ 33.371781] scsi 0:0:0:0: Direct-Access Generic STORAGE DEVICE 0207 PQ: 0 ANSI: 0
[ 33.389272] sd 0:0:0:0: Attached scsi generic sg0 type 0
[ 33.547735] sd 0:0:0:0: [sda] 7744512 512-byte logical blocks: (3.96 GB/3.69 GiB)
[ 33.557723] sd 0:0:0:0: [sda] Write Protect is off
[ 33.557784] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 33.591742] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 33.591857] sda: sda1
[ 33.637763] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 33.637827] sd 0:0:0:0: [sda] Attached SCSI removable disk
这个U盘我在电脑上测试读取文件可以达到大概20MB/s的，为何在210上的USB 口速度只有1MB/S，难道只跑在USB 1.1上了吗 谢谢
