uboot版本：U-Boot 2015.04-14490-g596b7a8-dirty
硬件按照官网 MX6-SabreSD 设计的，
现在 u-boot 能识别到u盘，但是读写有问题，
Boot from USB for mfgtools
Use default environment for mfgtools
Run bootcmd_mfg: <NULL>
=> usb start
starting USB...
USB0: Port not available.
USB1: USB EHCI 1.00
scanning bus 1 for devices... 3 USB Device(s) found
scanning usb for storage devices... 1 Storage Device(s) found
scanning usb for ethernet devices... 0 Ethernet Device(s) found
=>
=> usb info
1: Hub, USB Revision 2.0
- u-boot EHCI Host Controller
- Class: Hub
- PacketSize: 64 Configurations: 1
- Vendor: 0x0000 Product 0x0000 Version 1.0
Configuration: 1
- Interfaces: 1 Self Powered 0mA
Interface: 0
- Alternate Setting 0, Endpoints: 1
- Class Hub
- Endpoint 1 In Interrupt MaxPacket 8 Interval 255ms
2: Hub, USB Revision 2.0
- USB 2.0 Hub
- Class: Hub
- PacketSize: 64 Configurations: 1
- Vendor: 0x1a40 Product 0x0101 Version 1.17
Configuration: 1
- Interfaces: 1 Self Powered Remote Wakeup 100mA
Interface: 0
- Alternate Setting 0, Endpoints: 1
- Class Hub
- Endpoint 1 In Interrupt MaxPacket 1 Interval 12ms
3: Mass Storage, USB Revision 2.0
- KINGSTON DataTraveler G3 5C6418547ECC21BE064B3F28
- Class: (from Interface) Mass Storage
- PacketSize: 64 Configurations: 1
- Vendor: 0x1567 Product 0x8902 Version 1.0
Configuration: 1
- Interfaces: 1 Bus Powered 100mA
Interface: 0
- Alternate Setting 0, Endpoints: 2
- Class Mass Storage, Transp. SCSI, Bulk only
- Endpoint 1 In Bulk MaxPacket 512
- Endpoint 2 Out Bulk MaxPacket 512
=> usb dev 0
USB device 0:
Device 0: Vendor: KINGSTON Rev: 1.00 Prod: DataTraveler G3
Type: Removable Hard Disk
Capacity: 3841.9 MB = 3.7 GB (7868407 x 512)
... is now current device
=> usb read 0x1000 1 1
USB read: device 0 block # 1, count 1 ... EHCI timed out on TD - token=0x800d8d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x1f8c80
EHCI timed out on TD - token=0x128d80
EHCI timed out on TD - token=0xd8d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x1f8c80
EHCI timed out on TD - token=0x2008d80
EHCI timed out on TD - token=0xd8d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x1f8c80
EHCI timed out on TD - token=0x128d80
EHCI timed out on TD - token=0xd8d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x1f8c80
EHCI timed out on TD - token=0x2008d80
EHCI timed out on TD - token=0xd8d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x1f8c80
EHCI timed out on TD - token=0x128d80
EHCI timed out on TD - token=0xd8d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
EHCI timed out on TD - token=0x80008d80
0 blocks read: ERROR
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