我先擦除了emmc，然后拨码到boot from serial，按理说这样可以使用mfgtool下载程序了，但是我试验结果只能在板子刚上电的3-4秒能识别到HID设备，能够依次传输下载使用uboot和kernel，initramfs，到了jump to OS后就断开了，听到系统提示断开的声音，mfgtool显示No Device Connected，我重新上电，还是重复这个过程。 我的uboot和kernel，initramfs是自己编译的，确定是可以用的，之前用uboot的doload mode切换到下载模式，是可以正常下载的，但是擦出了emmc之后就不行了，hid设备只能维持3-4秒，即便是不启动mfgtool，也是刚上电能识别到，3-4秒就断开。另外我发现一个问题，无论我切换到boot from serial还是emmc，问题现象都是一样的跟上面相同，不知道怎么回事了，下面是mfgtool的log
11cf-88cb-001111000030}
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--index: 4
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--devPath: \\?\hid#vid_04ca&pid_0061#8&3692b335&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--index: 5
ModuleID[2] LevelID[1]: DeviceClass::FindDeviceByUsbPath() - DeviceListType_New--devPath: \\?\hid#vid_15a2&pid_0061#7&c2aecf9&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
ModuleID[2] LevelID[10]: new MxHidDevice[00997FA8]
ModuleID[2] LevelID[10]: DeviceClass::FindDeviceByUsbPath--DeviceListType_New, devInstPathToFind: USB\VID_15A2&PID_0061\6&3A7196B4&0&2, _deviceInstanceID: USB\VID_15A2&PID_0061\6&3A7196B4&0&2
ModuleID[2] LevelID[10]: DeviceClass::FindDeviceByUsbPath--DeviceListType_New, Find the device, Port: 2
ModuleID[2] LevelID[10]: DeviceClass::AddUsbDevice() successful USB#VID_15A2&PID_0061#6&3A7196B4&0&2#{A5DCBF10-6530-11D2-901F-00C04FB951ED} add to current list, retrycount: 0
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_ARRIVAL_EVT,[MxHidDeviceClass] vid_15a2&pid_0061, Hub:4-Port:2
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_ARRIVAL_EVT, Notify
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, Volume Arrive/Remove or Device Arrive/Remove
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, m_p_usb_port is not NULL, so only refresh
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, Volume/Device Arrive
ModuleID[2] LevelID[1]: CmdOpreation[0]--set m_hDeviceArriveEvent.
ModuleID[2] LevelID[10]: CmdOpreation[0]--WaitforEvents device arrive1
ModuleID[2] LevelID[10]: CmdOperation[0] device chagned and reset to state 0
ModuleID[2] LevelID[10]: ExecuteCommand--Boot[WndIndex:0], File is G:\MY-I.MX6 V2.5\4_ModuleID[2] LevelID[10]: ExecuteCommand--Load[WndIndex:0], File is G:\MY-I.MX6 V2.5\4_ModuleID[2] LevelID[10]: PortMgrDlg(0)--Command Load excute successfully, retry count: 0
ModuleID[2] LevelID[10]: ExecuteCommand--Load[WndIndex:0], File is G:\MY-I.MX6 V2.5\4_ModuleID[2] LevelID[10]: PortMgrDlg(0)--Command Load excute successfully, retry count: 0
ModuleID[2] LevelID[10]: ExecuteCommand--Jump[WndIndex:0]
ModuleID[2] LevelID[10]: *********MxHidDevice[00997FA8] Jump to Ramkernel successfully!**********
ModuleID[2] LevelID[10]: CmdOperation[0], current state command has been finished and the last command is successful, so SetEvent(hDevCanDeleteEvent)
ModuleID[2] LevelID[10]: DeviceManager::DevChangeWnd::OnDeviceChange() - DEVICE_REMOVAL_EVT(\\?\USB#VID_15A2&PID_0061#6&3a7196b4&0&2#{a5dcbf10-6530-11d2-901f-00c04fb951ed})
ModuleID[2] LevelID[10]: DeviceManager::DevChangeWnd::OnDeviceChange() - end
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_REMOVAL_EVT(\\?\USB#VID_15A2&PID_0061#6&3a7196b4&0&2#{a5dcbf10-6530-11d2-901f-00c04fb951ed})
ModuleID[2] LevelID[10]: DeviceClass::FindDeviceByUsbPath--DeviceListType_Current, _devices.size: 1
ModuleID[2] LevelID[10]: DeviceClass::FindDeviceByUsbPath--DeviceListType_Current, devInstPathToFind: USB\VID_15A2&PID_0061\6&3A7196B4&0&2, _deviceInstanceID: USB\VID_15A2&PID_0061\6&3A7196B4&0&2
ModuleID[2] LevelID[10]: DeviceClass::FindDeviceByUsbPath--DeviceListType_Current, Find the device
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_REMOVAL_EVT,[MxHidDeviceClass] vid_15a2&pid_0061, Hub:4-Port:2
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - DEVICE_REMOVAL_EVT, Notify
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, Volume Arrive/Remove or Device Arrive/Remove
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, m_p_usb_port is not NULL, so only refresh
ModuleID[2] LevelID[10]: CmdOpreation[0]--OnDeviceChangeNotify, Volume/Device Remove
ModuleID[2] LevelID[1]: CmdOpreation[0]--set m_hDeviceRemoveEvent.
ModuleID[2] LevelID[10]: CmdOpreation[0]--WaitforEvents device remove1
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent()-DEVICE_REMOVAL_EVT, hDevCanDeleteEvent has been set
ModuleID[2] LevelID[10]: delete MxHidDevice[00997FA8]
ModuleID[2] LevelID[10]: CCmdOpreation[0] thread is Closed
ModuleID[2] LevelID[10]: CCmdOpreation[0] thread is Closed
ModuleID[2] LevelID[10]: DeviceManager::OnMsgDeviceEvent() - EVENT_KILL
ModuleID[2] LevelID[10]: CMyExceptionHandler::OnMsgExceptionEvent() - KillExceptionHandlerThread
ModuleID[2] LevelID[10]: Exception Handler thread is closed
ModuleID[2] LevelID[1]: delete MxHidDeviceClass
ModuleID[2] LevelID[10]: Device Manager thread is closed
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