how to use a system DMA channel?

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  - 1
    - Show the "safe removal" dialog Is there an API to show the dialog programmatically? Tag: how to use a system DMA channel? Tag: 51947
  - 2
    - Performance question Hi, is it better (regarding the performance) to copy one large buffer via RtlCopyMemory or to copy some small buffer several times? Is there a tool that can do performance monitoring for drivers? Thanks a lot Peter Tag: how to use a system DMA channel? Tag: 51945
  - 3
    - USB to MIDI QUESTION BY NUBIE I am trying to use the FTDI232BM USB to serial chip in a MIDI application. The FT232BM chip comes with a WDM usb driver and API (FT_Write(lngHandle, strWriteBuffer, LENGTH_MESSAGE, lngBytesWritten))that I can use to send midi data to the chip and it will convert to MIDI serial output. I would like to use the windows MIDI API functions like IRET = midiOutShortMsg(MIDI_OUT_HANDLE, MIDIMSG). My question is what do I have to do to have the FT232BM chip recognized as a MIDI device? Why do I want it to be recognized as a MIDI device when I can already send midi data to it? So that CAKEWALK and other musical applications can use it. Thanks in advance for your input. Bob Tag: how to use a system DMA channel? Tag: 51939
  - 4
    - ISA Device Driver We are porting Device Control software from MSDOS to Windows 98 and need to write a Device Driver for a legacy ISA Interface Card with Visual C++ 5.0 and the Windows 98 DDK (Driver Development Kit). The sample ISA Device Driver in Chapter 7 of Walter Oney's book "Programming the Microsoft Windows Driver Model" works fine after adding an Interrupt Handler. However, my Device Driver will not install properly (Device Manager error code 2 and does not even call AddDevice or DriverEntry) unless Walter Oney's sample is installed first. The sample does not install properly either but any ideas how to fix this problem to make my Device Driver install independently ? Tag: how to use a system DMA channel? Tag: 51938
  - 5
    - [newbie] Linked list problem Hi again, just one question: How can I read a kernel double linked list in reverse order? Or, better to say, how can I access the 'last' (the item that linkes to the head again) item, if all I got is a pointer to the head? I've tried this one, but it doesn't seem to work: lastitem = CONTAINING_RECORD(DoubleHead.Blink,MYSTRUCT, linkfield); Any ideas? Thanks a lot Peter Tag: how to use a system DMA channel? Tag: 51936
  - 6
    - [Q] Many problems installing DDK I'm having a great deal of difficulty getting the Windows Server 2003 DDK to install correctly. I'd like to know if I'm doing something wrong and be set straight. (1) Attempting to build the samples in the kit fails, i.e., several of the samples fail with [relatively minor] errors: bin\x86\prefast\examples\pft-example2.cpp(17) : error C4700: local variable 'a' used without having been initialized bin\x86\prefast\examples\pft-example1.cpp(14) : error C4700: local variable 'j' used without having been initialized Granted, these are trivial but the docs say that the kit should build with no warnings or errors. Hence, my uncertainty as to the quality of the distribution. (2) The setenv.bat file, on line #254, sets an environment variable as follows: set _LINK_=/Tmp This causes the linker to fail because the file "/Tmp" can not be found. What is the _LINK_ symbol used for? This symbol occurs nowhere else in any makefile. *.def, or sources file. As far as I can tell, it's only purpose is to make my life difficult [:-) (3) Finally, when trying to link a simple user-mode application, the linker fails with a LNK4099 message: warning LNK4099: PDB 'mfcs42d.pdb' was not found with 'C:\local\sde\lib\winddk\3790\lib\wxp\i386\mfcs42d.lib' However, mfcs42d.pdb is nowhere in the DDK tree and nowhere on my system. Can someone help my out here? My dev and target platform are XP-Pro. Cheers, Michael Tag: how to use a system DMA channel? Tag: 51933
  - 7
    - Linked list in kernel mode Hi, I wrote the following code to walk a linked list: >LIST_ENTRY DoubleHead; //points to the head of the double-linked > list, initialized > > [...] > PLIST_ENTRY plistentry = NULL; > PMYSTRUCT pmystruct = NULL; > > if(!IsListEmpty(&DoubleHead)) > { > plistentry = DoubleHead.Flink; > while(plistentry != &DoubleHead) > { > pmystruct = CONTAINING_RECORD(plistentry, MYSTRUCT, > linkfield); > > [...]//Doing some checking with pmystruct here > plistentry = plistentry->Flink;//next one > } > } > Now, the problem is: although the list is filled with valid members (not shown), when I check the items that way, 'pmystruct' contains only invalid members. What am I doing wrong? Thanks a lot Peter Tag: how to use a system DMA channel? Tag: 51926
  - 8
    - How can we retrieve a postscript file information? Hello. I'm developing postscript driver plug-ins. I know that PScript5.dll makes poscript file information with print data stream from GDI information. I want to know how can I retrieve the postscript file information in rendering plug-in. Thanks, Tag: how to use a system DMA channel? Tag: 51925
  - 9
    - Creative WebCam NX Ultra & WIA Has anyone ever figured out how to access the Creative WebCam NX Ultra through the WIA scripting object model? The documentation on the WebCam NX Ultra says it is WIA compliant, but I am unable to access it. Here is the simple script that I have been using to test the camera which results in message boxing a zero. BTW-I called the Creative technical support, and they told me that as long as their application worked it was up to Microsoft to get the WIA api working. Another point, I hooked up a Canon 400S still camera (WIA compliant) to the same computer and it worked just fine. 'Testing Script Dim objWia Set objWia = CreateObject("Wia.Script") msgbox objWia.Devices.Count Tag: how to use a system DMA channel? Tag: 51917
  - 10
    - Purging System of Driver Junk I've been experimenting with USB driver development for a few months now, including "from-scratch" and using existing off-the-shelf drivers and tools. I'd like to completely purge my system of all accumulated junk related to these experiments. I figure I could do it as follows: 1) Browse the registry and remove all folders and symbolic links that contain my vendor and product ID?. 2) Search for and delete all .sys and .inf files that are specific to my driver. Is this the proper approach? Other suggestions? Thanks in advance for the help, Dennis Tag: how to use a system DMA channel? Tag: 51914
  - 11
    - RtlStringCbVPrintfExW linking error under Win2k Hi, I used RtlStringCbVPrintfExW routine, and it was built ok under Windows XP and Windows Server 2003. But I got the linking error under Windows 2000: my.obj : error LNK2019: unresolved external symbol __imp___vsnwprintf referenced in function _RtlStringVPrintfWorkerW@16 objchk_w2k_x86\i386\netvmini.sys : error LNK1120: 1 unresolved externals Does Windows 2000 not support that routine? PS. I have set the ntstrsafe.lib in my sources file: TARGETLIBS=$(DDK_LIB_PATH)\ndis.lib \ $(DDK_LIB_PATH)\ntstrsafe.lib Tag: how to use a system DMA channel? Tag: 51911
  - 12
    - UpdateDriverForPlugAndPlayDevices and SetupCopyOEMInf on Windows Hi, from what I gathered, the two following functions: UpdateDriverForPlugAndPlayDevices and SetupCopyOEMInf are not supported on Windows 98. I am writing a device installation app and I'd like to know how I can deal with it on 98? Preinstalling the drivers on a computer with no previous version of them would not be an absolute requirement: I can have the users install them manually when the device is first plugged in. But upgrading the drivers if necessary is an absolute *must*. And I have no clue how to do that programmatically on Windows 98. Any idea? I don't want to have to let the users upgrade the drivers manually: that would be too much of a hassle. Just to make things more precise, the device is an USB device: which means it can be plugged in when the installation occurs, or it can be unplugged... what I have written so far is fine on Windows 2000/XP/2003 (Me? not sure yet...). Tag: how to use a system DMA channel? Tag: 51909
  - 13
    - How to install a filter driver without restart? Hello, I am writing a filter driver for a USB device. I have followed the DDK instructions and produced an INF that installs the driver. However, The installation takes effect only after I restart the machine. Is there a way to install (and uninstall) a driver without the need for restart? The device for which the filter driver was written is installed and running at the time I execute the filter driver installation. This means that the device stack has to be restarted somehow. How can this be done? Thanks, Nir Tag: how to use a system DMA channel? Tag: 51908
  - 14
    - Video Display Mirror Driver hi all i am intersted in a Video Display Mirror Driver. is there anyone here who has developed such a beast? is anyone interested? please contact me for more information. assaf assafwo@hotmail.com Tag: how to use a system DMA channel? Tag: 51905
  - 15
    - Confused about Kernel Streaming / DShow clocks... Hi folks, Just a quick post to see if someone can clarify my understanding of kernel streaming clocks.- I think I've got the basics, but there are a few loose ends... I've got a multimedia card with separate audio and video capture drivers written under the stream class driver. At the moment, the captured audio & video has a habit of drifting out of sync, so I need to put clock support into the drivers. Additionally, the hardware has 27 MHz counter that can be queried to give me a very accurate clock source. As I currently understand it: a) I need to get both audio and video capture drivers to support being a master clock. b) I need to get the drivers to be able to timestamp samples based on the master clock for the graph (which might be themselves, or might be from somewhere else). Here's where I have a few questions... Q'n 1. It seems that there seem to be several ways of doing "a)" and "b)" - MSDN seems to indicate that I can do a) by including information in my HW_STREAM_OBJECT indicating that I can act as a master clock, by including appropriate clock support flags, and a callback routine (HW_CLOCK_OBJECT). - If I do that, then my clock support is going via the stream class driver. It then seems the the "similar" way of implementing b) is to use the "StreamClassQueryMasterClock" routine, using the clock handle passed to my driver via SRB_INDICATE_MASTER_CLOCK. Make sense so far? If so, then why is there also a whole load of KS Property stuff, which provide similar functionality? It seems that if I want to provide a master clock source via the KsProperty route,. then I'll have to implement KSPROPSETID_Clock, and also KS_PROPERTY_STREAM_MASTERCLOCK. Do I have to do both of these, or is it an either/or proposition, with the stream class driver doing some behind the scenes work for me in the first case? Qn 2: If I have the two filters running, and both can provide a master clock, then the audio capture driver will provide the master clock of the graph - so I need to get the other driver to timestamp samples based on the audio driver. StreamClassQueryMasterClock would seem to do the job if I want to use stream.sys, however, it's asynchronous, and it doesn't seem sensible to try and perform such a query every time a get a media sample. Any suggestions on strategies for getting the drivers to query the master clock at intervals and then interpolate? How is this normally done? Qn3: If I was to use the property set approach, instead of StreamClassQueryMasterClock, it seems that I need to get on driver to get hold of the direct call interface (KSPROPERTY_CLOCK_FUNCTIONTABLE) advertised by the other driver... how do I do that? thanks in advance, Martin Harvey. Tag: how to use a system DMA channel? Tag: 51904
  - 16
    - question about compatiblity Hi, I have a question about the compatibility for windows device driver. ScsiWritePortUlong, for example, it writes 4 bytes data into a scsi card's register. Will the Microsoft always define ULONG to 4 bytes even in the 64 bits or higher machine? Thanks Tag: how to use a system DMA channel? Tag: 51901
  - 17
    - Passing a struct address to a 16-bit driver dll I have started on an installable driver dll for a midi output device. I used MSVC 1.52c to build it. It works fine under Windows 3.11, but under Windows ME the address of the midiOutCapabilities struct seems to be wrong when modMessage receives the MODM_GETDEVCAPS message. I use a MIDIOUTCAPS __far * to adress the fields in the struct at the address passed via dwParam1. Is it because I compile it with MSVC 1.52c? I thought that should be ok since it produces 16 bit code. Any other ideas? -- The next step in human evolution must be built upon compassion, cooperation and a healthy competition. That is why we all help out here. Tag: how to use a system DMA channel? Tag: 51900
  - 18
    - how to enum the hardwares in win2000 ddk hey all , how to enum hardwares in win2000 ddk,get 'handle','hardwardId' of the listed hardwares. Any advice will be appreciated. Tag: how to use a system DMA channel? Tag: 51898
  - 19
    - In CE.net, how to support multiple display drivers? My run-time image includes two display .dll files and I use CreateDC to enable the second display driver. But only DispDrvrInitialize() is called. GPE *GetGPE() is not called.What should I do with it? Thanks a lot! Tag: how to use a system DMA channel? Tag: 51891
  - 20
    - UpdateDriverForPlugAndPlayDevices hangs with HWND Hoi. I am supplying some kind of application with my driver, which gives the user the possibility of adding or removing the driver dynamically. But since I got feedback of customers, the windows driver warning window sometimes appeares behind my application window, I am working on a patch (along with a few other bugfixes) right now. To solve the problem, I thought passing a HWND to the UpdateDriverForPlugAndPlayDevices function call should be the solution. But I cannot tell exactly, because every time I pass the window handle to the function, it stops responding. The window handle is a valid one from an mfc propertysheet of a different process. This propertysheet calls a method of an com interface of an local server com object (interactive user privilegs) which is loaded by an system service. The problem appears in the UpdateDriverForPlugAndPlayDevices as I found out with the debugger. The function hangs on forever, except for the case I kill the propertysheet's app. Doing so brings the UpdateDriverForPlugAndPlayDevices function back to life, reporting an error. Does anybody have an idea what causes the problem and how to solve it, or has anybody experienced similar situations with UpdateDriverForPlugAndPlayDevices? Thanks in advance, Laurents C. R. Meyer Tag: how to use a system DMA channel? Tag: 51889
  - 21
    - AVStream: failed to render video outpin of TV tuner filter. Dear All, I met a problem when I tried to render my video outpin of TV tuner filter and I listed two situation as following Case 1 : Only insert TV tuner filter by GraphEdit and render the video outpin of TV tuner filter. Result : Error code 0x80040111 (ClassFactory cannot supply requested class) Case 2 : Insert TV tuner and crossbar filters by GraphEdit and render the video outpin of TV tuner filter. Result : Success to render it. What's happened on Case 1? Did I miss some settings? Any comments are appreciated. Thanks, Edward Tag: how to use a system DMA channel? Tag: 51888
  - 22
    - IoWriteErrorLogEntry() Behaviour Dear all, When using IoWriteErrorLogEntry() to write my driver error messages i see an extra 28 bytes of data preceeding my actual data written. Is this the default behaviour, if so what is it & how to avoid? or am i messing up something. Also how to write type=information messages in the Event logger from driver. Thanks -Vijairaj Tag: how to use a system DMA channel? Tag: 51887
  - 23
    - AVStream: failed to connect TV tuner and TV audio decoder filters. Dear All, I implement a TV tuner, TV audio decoder and crossbar filters. I also implement PROPSETID_TUNER, PROPSETID_VIDCAP_CROSSBAR and PROPSETID_VIDCAP_TVAUDIO property set for them. My current status is that I could connect TV video pin of tuner filter to crossbar filter successfully. But I cannot connect TV audio outpin of tuner filter to TV audio inpin of TV audio filter. What value should I set to the TVAudioMedium fileld of KSPROPERTY_TUNER_CAPS_S structure if I want to connect TV audio outpin of tuner filter to TV audio filter (not crossbar filter)? PS : I have ever tried to set the GUID of TVAudioMedium to GUID_NULL and then my tuner audio outpin of tuner filter disappear. Any comments are welcome and very appreciated. Thanks, Edward Tag: how to use a system DMA channel? Tag: 51886
  - 24
    - enable/disable device I want hide the SCSI adapter device form device manager or have to prevent the user to enable/disable the device in device manager . thank y veeru Tag: how to use a system DMA channel? Tag: 51883
  - 25
    - CHAT: Windows Kernel Plug and Play and Power Management Ask The Experts: Windows Kernel Plug and Play and Power Management Join us for an online session that focuses on kernel-mode Plug and Play and power management concerns for driver developers, best practices for power management, and test processes and tools for testing Plug and Play and power management in drivers and hardware. October 20, 2004 10:00 - 11:00 A.M. Pacific time 1:00 - 2:00 P.M. Eastern time 17:00 - 18:00 GMT Chat time for cities world-wide: http://www.timeanddate.com/worldclock/fixedtime.html?day=20&month=10&year=2004&hour=10&min=0&sec=0&p1=234&sort=1 To add this chat to you calendar: http://msdn.microsoft.com/chats/outlook_reminders/04_ATEO_WIN_KERN_PnP_Oct20.ics For more info on MSDN chats, including other upcoming developer chats, chat archives, and other info see http://www.msdn.microsoft.com/chats Tag: how to use a system DMA channel? Tag: 51874
- Next
  - 1
    - Problems with PCI-X cards and PAE I have a Dell Power Edge 6650 with 8 GB of RAM (/PAE in my boot.ini). I have started adding cards to the PCI-X bus and am having a great deal of trouble running the apps for them unless I disable PAE. I get error messages from the applications like: "CDA_MemoryLock failed to lock DMA buffer into physical memory (returned 0xcd0e0000)" I have tried running both Windows XP Pro and Server 2003, Enterprise Ed. With the same result. With PAE I get the messages, without PAE, the apps seem to run. Unfortunately, I need the extra memory and we were planning on going from 8 GB to 32. Any thought on what is going on? Can I ask the OS to put the cards in a certain address range? Are the apps just not able to handle pointers to the memory beyond 4 G? I have the source for the apps, but I'd like to get a handle on what the problems might be before I spend a significant amount of time blindly poking around. Thanks in advance, Marc Reinig UCO/Lick Laboratory for Adaptive Optics Tag: how to use a system DMA channel? Tag: 51868
  - 2
    - Accessing a file on a volume by volume name In kernel mode, is there a way to access a file on a volume with a particular Volume ID string? In user mode, I can do it with CreateFile, but I haven't been able to get it to work with ZwOpenFile. Tag: how to use a system DMA channel? Tag: 51866
  - 3
    - Q:Printer driver, paper information from MS Word I have a monolithic printerdriver under XP, but I can NOT seem to figure out how to read paper information from MS Word. In DrvDocumentPropertySheets, where I would expect to get the information, the DEVMODE from Word just returns my internal paper settings that I provided on first call, and I can NOT seem to force it to do otherwise. Any help ? Tag: how to use a system DMA channel? Tag: 51864
  - 4
    - Accessing the SMBus through a Via 82C686 I am trying to talk to a device in an embedded PC that is on the SMBus. The SMBus controller is a VT82C686. I have never done driver development in Windows before so I'm a bit unsure of how to proceed. I've read the relevant sections in the Windows DDK and the questions and answers on usenet. The DDK example appears to be for writing a driver for a SMBus controller, rather than talking to an existing third-party driver. As the Microsoft-written drivers won't work with the Via chipset, I'm assuming the information I need will be from Via rather than MS. The DDK confused me. Can I just write a user-space application to talk to the SMBus controller, and have that pass on information? Does anybody know where information on using the Via driver is? Many thanks for any help. Stephen. Tag: how to use a system DMA channel? Tag: 51859
  - 5
    - Read a file currently beeing used by a driver Hi In my driver, I do log some data in af file on the harddrive. It would be nice to read the file with notepad, will the driver still is running and using the file. I do have some problems doing this. This is what I would like to do: Read the file in eg. Notepad, while the driver stilling using the file If the file allready exits, the driver opens the file, and append anything new to it. This is how I open the file in the driver // Create the file status = ZwCreateFile( &hLogFile, SYNCHRONIZE, &objectAttributes, &IoStatus, 0, FILE_ATTRIBUTE_NORMAL, FILE_SHARE_WRITE | FILE_SHARE_WRITE, FILE_OPEN_IF, FILE_SYNCHRONOUS_IO_NONALERT, NULL, 0 ); I guess the problem is in the way I create the file, but what ? Thomas Tag: how to use a system DMA channel? Tag: 51856
  - 6
    - USB Video Class, How to Make firmware I am developping USB Video Class compilant device. I am trying to make USB Video Class Descriptors as USB Device Firmware such as Device Descriptor or vc interface descriptor. My device do not works at all. I writed USB Video Class Descriptors by reference to [ USB Device Class Definition for Video Devices Video Device Examples ] . please tel me Descriptors examples. Tag: how to use a system DMA channel? Tag: 51853
  - 7
    - usbhub.sys lower filter driver I have a usbhub.sys lower filter driver where I would like to filter URBs and make changes to them.when I recieve a URB,I want to send my own request down and on it's return change the URB and send it back.any hints on how I go about doing this would be welcome Tag: how to use a system DMA channel? Tag: 51851
  - 8
    - Build Environment hello, anybody who knows where to find about the buidling environment for creating printer drivers for : 1. Windows 9x/Me 2. Windows NT4 3. Windows 2000/XP thanks in advance. Tag: how to use a system DMA channel? Tag: 51848
  - 9
    - /NOLOWMEM does not work I want to test handling of physical addresses above 4 GB in my kernel driver. The test system: 8 GB RAM Windows 2000 Advanced Server with all patches installed. The boot.ini entry: /PAE /3GB /NOLOWMEM /NUMCPUS=1 It seems that /NOLOWMEM flag doesn't work -- Task Manager and WinDbg !vm command still show about 8000 MB of RAM. /NOLOWMEM should be compatible with /3GB according to http://www.microsoft.com/whdc/system/platform/server/PAE/PAEdrv.mspx "The /PAE, /NOLOWMEM and /3GB switches, and the registry change, can be used at once. Note that /3GB will prevent access to physical memory beyond 16 GB because the kernel memory space is reduced with the /3GB switch, and thus does not have enough room for the additional Page Table Entries required when memory is larger than 16 GB." What can be wrong with my setup? Dmitriy Budko, VMware Tag: how to use a system DMA channel? Tag: 51846
  - 10
    - Windows XP SP2 Printer Driver problem... A printer driver that was written and compiled using NTDDK was working fine for Windows 2000/XP. After installing XP SP2 the printer driver now causes a memory access violation in explorer.exe when selecting 'Printer Preferences' from the printer driver's property page about 4 out of 5 times. After re-compiling the driver with the current SDK (WINDDK\3790) it still has the same problem but only 1 in about 10 times does the access violation occur. Any help is appreciated. Thanks. Tag: how to use a system DMA channel? Tag: 51843
  - 11
    - Missing packet over HID USB stack Hi, I have a custom kernel mode function driver for a HID USB device. In Win2000 (SP4) I see a strange problem: after first time installation, the driver fails to read the first report (of 63 bytes data + 1 byte report id). I use a separate thread in which IRP_MJ_READ requests are issued to the HIDClass driver. It is seen that the requests block until some data is obtained, which is quite fine. But it fails to return the very first packet. All remaining packets are retrived properly. I am sure that the first packet is properly transmitted across the bus from data from USB tracer log. Notably, this behavior happens only during the first use of the device after fresh installation of the driver. Issue does not happen if the device is re-plugged and used again. Also this issue is not seen on the same driver when used in XP. Does anyone have clue what is going wrong in my Win2000 environment? Thanks in advance. Najas Tag: how to use a system DMA channel? Tag: 51838
  - 12
    - NO_MORE_IRP_STACK_LOCATIONS When Calling IoCallDriver(). Hi, I am writing a dynamically loaded upper filter driver for a serial port. My driver loads succesfully and I then send it a special "start" IOCTL containing the name of the serial port device it is to open (i.e. "\??\COM4"). This is the code for my IOCTL (with error checking removed for clarity). This has been cribbed from a variety of sources including Walt Oney's book. ---------- NTSTATUS DispatchControl(PDEVICE_OBJECT fdo, PIRP Irp) { PAGED_CODE(); PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION) fdo->DeviceExtension; NTSTATUS status = STATUS_SUCCESS; ULONG info = 0; PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(Irp); ULONG cbin = stack->Parameters.DeviceIoControl.InputBufferLength; ULONG cbout = stack->Parameters.DeviceIoControl.OutputBufferLength; ULONG code = stack->Parameters.DeviceIoControl.IoControlCode; switch(code) { case MY_IOCTL: // Copy passed-in data to a unicode string. // (This will be something like "\??\COM4"). UNICODE_STRING PortName; WCHAR wPortName[32]; swprintf(wPortName,(WCHAR*)Irp->AssociatedIrp.SystemBuffer,cbin); RtlInitUnicodeString(&PortName,wPortName); // Use the Unicode string to get a pointer to the current device for (ie) COM4. PFILE_OBJECT FileObject = NULL; PDEVICE_OBJECT DeviceObject = NULL; status=IoGetDeviceObjectPointer(&PortName, FILE_READ_DATA, &FileObject, &DeviceObject); pdx->Pdo = DeviceObject; pdx->LowerDeviceObject = IoAttachDeviceToDeviceStack(fdo,DeviceObject); PIO_STACK_LOCATION pIrpStack = IoGetNextIrpStackLocation(Irp); ObDereferenceObject(FileObject); pIrpStack->MajorFunction = IRP_MJ_CREATE; /////// Bug Check when next line executed. status = IoCallDriver(pdx->LowerDeviceObject,Irp); Any help would be greatly appreciated. Thanks O.C. Tag: how to use a system DMA channel? Tag: 51822
  - 13
    - Printer Driver upgrade Hi, When we upgrade a Microsoft Unidriver based Printer driver with the render and/or UI Plug-in dlls currently loaded by Explorer, the spooler uses the some algorithm wherein it replaces the files in the 3 directory(C:\WINNT\system32\spool\drivers\w32x86\3) with the new version and then copies the current version(currently loaded by exlporer) into the 'C:\WINNT\system32\spool\drivers\w32x86\3\Old' directory. I have observed the same behavior with Monolithic printer drivers too wherein the render and/or UI dlls even if currently loaded by Explorer or any other App(Print dialog -> Properties) are replaced/upgraded in the 3 directory and the current version is copied into the 3\old directory. Now this is something that doesn't happen for other driver dependent files in the 3 directory. One thing that really puzzles me is the fact that the Process Explorer tool shows the UI/Render dlls loaded from 3 directory after upgrade but Iam unable to delete the dlls in the 3\old directory as well, which says 'access denied'. Iam not sure who's keeping the files loaded from 3\old directory? Any clue as to whats happening here would be of great help to me. Is this something being done by spooler, as a special case processing? Thanks & Regards, Harsha. Tag: how to use a system DMA channel? Tag: 51821
  - 14
    - Software only driver I am old in C/C++ programming but VERY new in drivers programming. I will need a bit of guidance, as my only book on the subject WDM - Walter Oney I've read did not helped. I want to build a "software only" driver that simulates an hard disk drive (virtual disk) that will keep in a file all its data. I want this to work on 98, 2000, XP and 2003. For the moment the target is only XP. 1. Do I need WDM or not? What are the sides to these two choices? 2. Do I need PnP and/or Power Management? What if I do not implement these for a "software only driver". 3. What is a legacy driver of type: "Kernel Mode Service"? Should I use this? Thanks and I will highly appreciate any answer or piece of information I can get from you. TIA Tag: how to use a system DMA channel? Tag: 51820
  - 15
    - Multiple instances Hi all, i developed a serial virtual port wdm driver. Now i'd like to have more than one instance of that port but when i install the second instance i have a generic error (it is not possible to load the driver). If i open my custom properties sheet for the second instance, i have the parameter coming from the first instance .... but i think this is a consequence of the starting error. How about the DLL and sys files ? They should be common for every instance ... is there a reference counter? If i update the driver, then it will be update for every instance of the port ? thanks a lot -- Stefano M Tag: how to use a system DMA channel? Tag: 51819
  - 16
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  - 17
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  - 19
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  - 20
    - The simplest way replace KS minidriver ? This is a multi-part message in MIME format. ------=_NextPart_000_0023_01C49A75.57101760 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Several days I am trying to learn how to uninstall "avshws" sample = driver, see news:%23j88RejlEHA.2764@TK2MSFTNGP11.phx.gbl I try to implement Max's recommendation concerning unregistration from = SWENUM, but it is still NOT OK. To continue my development, I tried to "workaround" this problem and = replace the existing driver in the simplest way: 1. Disable it using Device Manager 2. Replace the file avshws.sys in "system32/drivers" with new one 3. Enable it using Device Manager But - in most cases - GraphEdit application continued running OLD driver = version ! I have DELETED avshws.sys from "system32/drivers", and checked that = there is no any copy of it in my computer - and GraphEdit application = continued running the graph with old avshws.sys, that is PHYSICALLY = DELETED ! The only non-mistics explanation is, that GraphEdit uses some cash and = doesn't clean it. And this is NOT the cash that can be seen using = "Graph\Enum Cashed Filters" menu items - it is empty ! My questions are: 1. How GraphEdit "secret cash" can be cleaned ? 2. What is the "legal" simplest way to replace KS minidriver to its new = version ? Thanks,=20 Zvi ------=_NextPart_000_0023_01C49A75.57101760 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2900.2180" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>Several days I am trying to learn how=20 to uninstall "avshws" sample driver, see</FONT></DIV> <DIV><A=20 href=3D"news:%23j88RejlEHA.2764@TK2MSFTNGP11.phx.gbl">news:%23j88RejlEHA.= 2764@TK2MSFTNGP11.phx.gbl</A></DIV> <DIV><FONT face=3DArial size=3D2>I try to implement Max's recommendation = concerning=20 unregistration from SWENUM, but it is still NOT OK.</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>To continue my development, I tried = to "workaround"=20 this problem and replace the existing driver in the simplest = way:</FONT></DIV> <DIV><FONT face=3DArial>1. Disable it using Device Manager</FONT></DIV> <DIV><FONT face=3DArial>2. Replace the file avshws.sys in = "system32/drivers" with=20 new one</FONT></DIV> <DIV><FONT face=3DArial>3. Enable  it using Device = Manager</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>But - in most cases - GraphEdit application = continued=20 running OLD driver version !</FONT></DIV> <DIV><FONT face=3DArial>I have DELETED avshws.sys from = "system32/drivers", and=20 checked that there is no any copy of it in my computer - and GraphEdit=20 application continued running the graph with old avshws.sys, that is = PHYSICALLY=20 DELETED !</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>The only non-mistics explanation is, that = GraphEdit uses=20 some cash and doesn't clean it. And this is NOT the cash that can be = seen using=20 "Graph\Enum Cashed Filters" menu items - it is empty !</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>My questions are:</FONT></DIV> <DIV><FONT face=3DArial>1. How GraphEdit "secret cash" can be cleaned=20 ?</FONT></DIV> <DIV><FONT face=3DArial>2. What is the "legal" simplest way to replace = <FONT=20 size=3D1>KS minidriver to its new version ?</FONT></FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>Thanks, </FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>    = Zvi</FONT></DIV></BODY></HTML> ------=_NextPart_000_0023_01C49A75.57101760-- Tag: how to use a system DMA channel? Tag: 51769
  - 21
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  - 23
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  - 24
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  - 25
    - RtlZeroMemory Hi Just a quick one I use RtlZeroMemory to zero out a structure. This structure containes another structure. So does that second structure get zero'ed out to ? Thomas Tag: how to use a system DMA channel? Tag: 51754

hello,
Everybody, I am writing a PCI driver. In this device ,there is no Pci
interface chip,
so I need to get a system DMA channel. But I don't konw how.In the pnp start
IRP£¬there is
no DMA resource for me to use.
Another question is that how to use the system DMA channel? I know if
the device has got its
own dma channel,usually,I can set the start address,and counter,and trigger
the DMA. But using
system DMA channel, how to do these thing?
Any advice or disscusion is welcome.
sean

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Re: how to use a system DMA channel? by Maxim

Maxim
Mon Sep 20 07:41:39 CDT 2004

> Everybody, I am writing a PCI driver. In this device ,there is no Pci
> interface chip,
> so I need to get a system DMA channel.

You cannot. System DMA is ISA only.

If you need the PCI device to do DMA - you must have busmaster logic in the
hardware.

Note that Directed DMA (used in SoundBlasters) is not a solution. The card
still must have the busmaster logic. D-DMA only exposes the card's busmaster as
ISA DMA port-wise.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

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