u-boot移植本来已经正确完成了，下面是移植成功后usb的打印信息：
HIT53_COME=> usb start
(Re)start USB...
USB0: USB EHCI 1.00
scanning bus 0 for devices... 2 USB Device(s) found
scanning usb for storage devices... 1 Storage Device(s) found
但是楼主手贱，不知道是怎么动了硬件，过了一会儿又检测不到usb设备了，打印信息：
HIT53_COME=> usb start
(Re)start USB...
USB0: USB EHCI 1.00
scanning bus 0 for devices... 1 USB Device(s) found
scanning usb for storage devices... 0 Storage Device(s) found
可以肯定软件是肯定没问题的，因为已经正确启动过了。肯定是硬件出了问题
本小白没有研究过usb驱动，所以不能判断打印信息的含义是什么。下面是加入“DEBUG”宏后详细的打印信息。看不懂，求大神帮忙分析一下！小弟在此谢过！
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加入“DEBUG”宏后详细的打印信息：（检测不到usb）
HIT53_COME=> usb start （输入usb start指令） (Re)start USB... USB0: Register 10011 NbrPorts 1 USB EHCI 1.00 scanning bus 0 for devices... New Device 0 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0length 0x40 req=6 (0x6), type=128 (0x80), value=256, index=0 USB_DT_DEVICE request set address 1 usb_control_msg: request: 0x5, requesttype: 0x0, value 0x1 index 0x0length 0x0 req=5 (0x5), type=0 (0x0), value=1, index=0 USB_REQ_SET_ADDRESS Len is 0 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0length 0x12 req=6 (0x6), type=128 (0x80), value=256, index=0 USB_DT_DEVICE request usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0length 0x9 req=6 (0x6), type=128 (0x80), value=512, index=0 USB_DT_CONFIG config usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0length 0x19 req=6 (0x6), type=128 (0x80), value=512, index=0 USB_DT_CONFIG config get_conf_no 0 Result 25, wLength 25 if 0, ep 0 ##EP epmaxpacketin[1] = 2048 set configuration 1 usb_control_msg: request: 0x9, requesttype: 0x0, value 0x1 index 0x0length 0x0 req=9 (0x9), type=0 (0x0), value=1, index=0 USB_REQ_SET_CONFIGURATION Len is 0 new device strings: Mfr=1, Product=2, SerialNumber=0 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x300 index 0x0length 0xFF req=6 (0x6), type=128 (0x80), value=768, index=0 USB_DT_STRING config USB device number 1 default language ID 0x1 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x301 index 0x1length 0xFF req=6 (0x6), type=128 (0x80), value=769, index=1 USB_DT_STRING config usb_control_msg: request: 0x6, requesttype: 0x80, value 0x302 index 0x1length 0xFF req=6 (0x6), type=128 (0x80), value=770, index=1 USB_DT_STRING config Manufacturer u-boot Product EHCI Host Controller SerialNumber USB hub found usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2900 index0x0 length 0x4 req=6 (0x6), type=160 (0xa0), value=10496, index=0 USB_DT_HUB config usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2900 index0x0 length 0x8 req=6 (0x6), type=160 (0xa0), value=10496, index=0 USB_DT_HUB config 1 ports detected ganged power switching standalone hub global over-current protection power on to power good time: 20ms hub controller current requirement: 0mA port 1 is removable usb_control_msg: request: 0x0, requesttype: 0xA0, value 0x0 index 0x0length 0x4 req=0 (0x0), type=160 (0xa0), value=0, index=0 get_hub_status returned status 1, change 1 local power source is lost (inactive) no over-current condition exists enabling power on all ports usb_control_msg: request: 0x3, requesttype: 0x23, value 0x8 index 0x1length 0x0 req=3 (0x3), type=35 (0x23), value=8, index=1 Len is 0 port 1 returns 0 usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1length 0x4 req=0 (0x0), type=163 (0xa3), value=0, index=1 Port 1 Status 500 Change 0 1 USB Device(s) found scan end scanning usb for storagedevices... 0 Storage Device(s) found
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而正确的打印信息应该是下面这样：
HIT53_COME=> usb start (Re)start USB... USB0: Register 10011 NbrPorts 1 USB EHCI 1.00 scanning bus 0 for devices...New Device 0 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0length 0x40 req=6 (0x6), type=128 (0x80), value=256, index=0 USB_DT_DEVICE request set address 1 usb_control_msg: request: 0x5, requesttype: 0x0, value 0x1 index 0x0length 0x0 req=5 (0x5), type=0 (0x0), value=1, index=0 USB_REQ_SET_ADDRESS Len is 0 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0length 0x12 req=6 (0x6), type=128 (0x80), value=256, index=0 USB_DT_DEVICE request usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0length 0x9 req=6 (0x6), type=128 (0x80), value=512, index=0 USB_DT_CONFIG config usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0length 0x19 req=6 (0x6), type=128 (0x80), value=512, index=0 USB_DT_CONFIG config get_conf_no 0 Result 25, wLength 25 if 0, ep 0 ##EP epmaxpacketin[1] = 2048 set configuration 1 usb_control_msg: request: 0x9, requesttype: 0x0, value 0x1 index 0x0length 0x0 req=9 (0x9), type=0 (0x0), value=1, index=0 USB_REQ_SET_CONFIGURATION Len is 0 new device strings: Mfr=1, Product=2, SerialNumber=0 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x300 index 0x0length 0xFF req=6 (0x6), type=128 (0x80), value=768, index=0 USB_DT_STRING config USB device number 1 default language ID 0x1 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x301 index 0x1length 0xFF req=6 (0x6), type=128 (0x80), value=769, index=1 USB_DT_STRING config usb_control_msg: request: 0x6, requesttype: 0x80, value 0x302 index 0x1length 0xFF req=6 (0x6), type=128 (0x80), value=770, index=1 USB_DT_STRING config Manufacturer u-boot Product EHCI Host Controller SerialNumber USB hub found usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2900 index0x0 length 0x4 req=6 (0x6), type=160 (0xa0), value=10496, index=0 USB_DT_HUB config usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2900 index0x0 length 0x8 req=6 (0x6), type=160 (0xa0), value=10496, index=0 USB_DT_HUB config 1 ports detected ganged power switching standalone hub global over-current protection power on to power good time: 20ms hub controller current requirement: 0mA port 1 is removable usb_control_msg: request: 0x0, requesttype: 0xA0, value 0x0 index 0x0length 0x4 req=0 (0x0), type=160 (0xa0), value=0, index=0 get_hub_status returned status 1, change 1 local power source is lost (inactive) no over-current condition exists enabling power on all ports usb_control_msg: request: 0x3, requesttype: 0x23, value 0x8 index 0x1length 0x0 req=3 (0x3), type=35 (0x23), value=8, index=1 Len is 0 port 1 returns 0 usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1length 0x4 req=0 (0x0), type=163 (0xa3), value=0, index=1 Port 1 Status 501 Change 1 port 1 connection change usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1length 0x4 req=0 (0x0), type=163 (0xa3), value=0, index=1 portstatus 501, change 1, 480 Mb/s usb_control_msg: request: 0x1, requesttype: 0x23, value 0x10 index 0x1length 0x0 req=1 (0x1), type=35 (0x23), value=16, index=1 Len is 0 hub_port_reset: resetting port 0... usb_control_msg: request: 0x3, requesttype: 0x23, value 0x4 index 0x1length 0x0 req=3 (0x3), type=35 (0x23), value=4, index=1 Len is 0 usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1length 0x4 req=0 (0x0), type=163 (0xa3), value=0, index=1 portstatus 503, change 10, 480 Mb/s STAT_C_CONNECTION = 0 STAT_CONNECTION = 1 USB_PORT_STAT_ENABLE 1 usb_control_msg: request: 0x1, requesttype: 0x23, value 0x14 index 0x1length 0x0 req=1 (0x1), type=35 (0x23), value=20, index=1 Len is 0 New Device 1 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0length 0x40 dev=3ffb26c0, pipe=80000083, buffer=3fe2d560, length=64, req=3fe2d4c0 req=6 (0x6), type=128 (0x80), value=256 (0x100), index=0 TOKEN=0x8c00 hub_port_reset: resetting port 0... usb_control_msg: request: 0x3, requesttype: 0x23, value 0x4 index 0x1length 0x0 req=3 (0x3), type=35 (0x23), value=4, index=1 Len is 0 usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1length 0x4 req=0 (0x0), type=163 (0xa3), value=0, index=1 portstatus 503, change 10, 480 Mb/s STAT_C_CONNECTION = 0 STAT_CONNECTION = 1 USB_PORT_STAT_ENABLE 1 usb_control_msg: request: 0x1, requesttype: 0x23, value 0x14 index 0x1length 0x0 req=1 (0x1), type=35 (0x23), value=20, index=1 Len is 0 set address 2 TOKEN=0x8c00 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0length 0x9 dev=3ffb26c0, pipe=80000283, buffer=3fe2d560, length=9, req=3fe2d4a0 req=6 (0x6), type=128 (0x80), value=512 (0x200), index=0 TOKEN=0x8c00 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0length 0x20 dev=3ffb26c0, pipe=80000283, buffer=3fe2d560, length=32, req=3fe2d4a0 req=6 (0x6), type=128 (0x80), value=512 (0x200), index=0 TOKEN=0x8c00 get_conf_no 0 Result 32, wLength 32 if 0, ep 0 if 0, ep 1 ##EP epmaxpacketin[2] = 512 ##EP epmaxpacketout[1] = 512 set configuration 1 usb_control_msg: request: 0x9, requesttype: 0x0, value 0x1 index 0x0length 0x0 dev=3ffb26c0, pipe=80000203, buffer=00000000, length=0, req=3fe2d4e0 req=9 (0x9), type=0 (0x0), value=1 (0x1), index=0 TOKEN=0x8c00 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x302 index0x409 length 0xFF dev=3ffb26c0, pipe=80000283, buffer=3fe2d300, length=255, req=3fe2d240 req=6 (0x6), type=128 (0x80), value=770 (0x302), index=1033 TOKEN=0x8c00 usb_control_msg: request: 0x6, requesttype: 0x80, value 0x303 index0x409 length 0xFF dev=3ffb26c0, pipe=80000283, buffer=3fe2d300, length=255, req=3fe2d240 req=6 (0x6), type=128 (0x80), value=771 (0x303), index=1033 TOKEN=0x8c00 Manufacturer General Product USB Flash Disk SerialNumber 4AA835B9D3588D80 2 USB Device(s) found scan end scanning usb for storagedevices... usb_control_msg: request: 0xFE, requesttype: 0xA1, value 0x0 index 0x0length 0x1 dev=3ffb26c0, pipe=80000283, buffer=3fe2dd00, length=1, req=3fe2dc80 req=254 (0xfe), type=161 (0xa1), value=0 (0x0), index=0 TOKEN=0x8c00 dev=3ffb26c0, pipe=c0008203, buffer=3fe2dbc0, length=31, req=00000000 TOKEN=0x80008c01 dev=3ffb26c0, pipe=c0010283, buffer=3fe2dc40, length=8, req=00000000 TOKEN=0x8d00 dev=3ffb26c0, pipe=c0010283, buffer=3fe2db80, length=13, req=00000000 TOKEN=0x80008d00 dev=3ffb26c0, pipe=c0008203, buffer=3fe2d920, length=31, req=00000000 TOKEN=0x8c01 dev=3ffb26c0, pipe=c0010283, buffer=3fe2d9e0, length=512, req=00000000 TOKEN=0x8d00 dev=3ffb26c0, pipe=c0010283, buffer=3fe2d8e0, length=13, req=00000000 TOKEN=0x80008d00 1 Storage Device(s) found | 
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