Qualcomm USB Host Driver version 2.0.2.7 for Windows 2000/Windows XP This readme covers important information regarding Qualcomm USB Host Driver version 2.0.2.7 for Windows 2000 and Windows XP Table of Contents 1. Installation Notes 2. Major Features 3. What's New in This Release 4. Known issues 5. Build Information ---------------------------------------------------------------------- 1. INSTALLATION NOTES Please refer to Qualcomm document 80-V4609-1 Rev H for detailed instructions on driver installation. The aforesaid document is encloded in the driver package. ---------------------------------------------------------------------- 2. MAJOR FEATURES 1) Major bug fixes for operations under Windows XP, backward compatible with Windows 2000. 2) Introduced new solution to the Windows open handle issue. The solution makes the USB virtual/PNP COM port's behavior similar to that of a physical COM port when device is reset or disconnected. 3) The driver is re-designed to be reentrant, which may allow multiple device connections on Windows XP over a single USB hub. Please note, multiple connections on Windows 2000 or through multiple USB hubs on Windows XP may cause system crash unless the devices completely remove their USB serial number string from the USB descriptor. 4) Vitually eliminated use of global cancel spin lock. This not only boosts the performance of the whole system but also makes the current driver much faster from one USB transfer to another, thus makes short packet handling more efficient. 5) The driver is designed to be running safe with Intel Hyper-Threading processor and multi-processor systems with Windows XP, and multi-processor systems with Windows 2000. 6) Added true resident mode to the driver. Users can configure the driver to be a true resident driver instead of a PNP driver at run-time via registry settings. This feature itend to provide the ultimate solution to all the issues caused by device reset/disconnection. Under the true-resident mode, the driver will maintain its virtual(PNP) COM port(s) at all times and thus try to make the virtual(PNP) COM port behave as same as a traditional/physical COM port when the device is disconnected or reset. For details, please refer to section 9.4.2 in Qualcomm document 80-V4609-1 Rev D. By default, the driver operates under PNP mode. ---------------------------------------------------------------------- 3. What's New in This Release 1) Fixed the bug in the debug output macro that could trigger system crash during device removal. This bug is specific to the debug/checked build. The free build does not have this issue. (2026) 2) Fixed the bug that could trigger system crash when power IRP came in during device removal. (2027) 3) Added support for stopping registry access after device removal. (2027) 4) Enabled registry access when the device is stopped or selectively suspended so that the driver could be configured at run-time. (2027) ---------------------------------------------------------------------- 4. KNOWN ISSUES: A user running CAIT 3.0.29 or older version with USB host driver 2.x version may experience 100% CPU usage and CAIT may appear to be spining on something without working properly. To solve this problem, the user needs to unselect "Require phone on CTS transition" on Phone tab from Options->Configures CAIT dialog box or change use_CTS to NO at cait.ini file. This issue is triggered by the enhanced efficiency of the USB driver and is to be addressed in later CAIT releases. Compilation flag QCSER_TARGET_XP should NOT be defined with this version due to unsolved issues with XP-specific function calls. Rarely, when the modem connection is up but the device is reset or disconnected/ re-connected, modem application may not be able to talk to modem port. A workaround is to perform a second reset or re-connection of the device. It's also recommended that users obtain Mirosoft hotfix Q822112 to reduce the possibility of this problem. This problem is fixed in Windows XP SP2. ---------------------------------------------------------------------- 5. BUILD INFORMATION: The following compilation flags are defined for customers to build the driver to debug various issues related to host and device, they are not recommended for other purposes. ENABLE_LOGGING QCSER_ENABLE_LOG_REC QCSER_DBGPRINT QCSER_DBGPRINT2 QCSER_TARGET_XP IMPORTANT!!! To achieve best security and performance, all of the above features should be turned off for commercial distributions. The free build binaries are recommended for commercial distributions. ---------------------------------------------------------------------- Copyright (c) 2003, 2004, 2005 QUALCOMM Incorporated All rights reserved.