Named Pipe Serial Port

1. Named Pipe To Serial Port Hyper-v
2. Named Pipe Serial Port Charlotte
3. Named Pipe Serial Port Angeles

I would like to redirect the serial port output on RedHat 5.7 to some recordable or reviewable medium.

In Hyper-V on the XP guest I edited the COM1 Serial Port setting by selecting Named Pipe and in the pipe name field entered COM3 this caused the Named pipe path: field to display. I then connected the serial cable to the port ran Putty on the guest as admin and nothing displays, there is no interaction. Aug 05, 2015  Hi, I've created this little program to be able to have all the joys of a serial port in most virtual machines by Microsoft. It reads from the namedpipe created by the vm on the host and writes that to a comport of your choice. You can set up virtual serial ports connections for vSphere virtual machines in several ways. The connection method that you select depends on the task that you need to accomplish. Server and Client Connections for Named Pipe and Network Serial Ports. To use a serial port for logging, select a client connection. This selection allows.

I have a USB-to-serial adapter that shows up as COM1 on Windows 10. On my Windows 7 VM I'd like to link the virtual COM1 port to the physical (USB-to-serial) port defined on Windows 10. Looking at the settings for the VM, it seems as though I might be able to do this using a named pipe. In VMWare ESX I could do something similar, where the serial port can be redirected to a file giving me the same effect. Hyper-V redirects serial output to a named pipe, no file option. Is there a program that I can run on the Hyper-V hypervisor that lets me capture the named pipe to a file? (Could I do this with HyperTerminal or TeraTerm somehow?). Windows Named Pipes.One of the methods to perform IPC in Microsoft Windows.One-way or duplex pipe for communication between the pipe server and one or more pipe clients.Utilizes a unique file system called NPFS(Named Pipe Filesystem).Any process can access named pipes, subject to security checks.

The normal way to do this on a physical machine is to add the console parameters to the kernel in grub like what's below, connect it to another machine via a serial port and null modem cable and use minicom, hyperterminal or TeraTerm with matching settings, which would enable viewing the console startup messages on the machine and debug output if the kernel crashes (and log them to a file in the case of Tera Term).

kernel /vmlinuz-2.6.18-274.el5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet crashkernel=128M@16M console=tty0 console=ttyS0,38400 hda=noprobe hdb=noprobe

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In VMWare ESX I could do something similar, where the serial port can be redirected to a file giving me the same effect.

Hyper-V redirects serial output to a named pipe, no file option.

Is there a program that I can run on the Hyper-V hypervisor that lets me capture the named pipe to a file? (Could I do this with HyperTerminal or TeraTerm somehow?) Or would I have to write a program from scratch to accomplish this?

1 Answer

Under Windows 10

1. Run PuTTY as administrator
2. In the session options, select Serial
3. Set the Serial Line to the named pipe, e.g. .pipemy_named_pipe
4. Set the Speed to something faster if desired

Not the answer you're looking for? Browse other questions tagged hyper-vvirtual-machinesvmware-esxserialcom or ask your own question.

Yesterday's blog prompted some questions about how to set up a debugger for a Windows OS running in a Hyper-V VM.I was surprised that I wasn't able to find good, publicly available, Microsoft issued documentation for this configuration.

The first step is to configure the Windows OS in the VM to enable a kernel debugger on COM1.One would use these same steps if you were preparing the OS to be debugged using a null modem cable. Hyper-V will allow us to redirect the COM port so that we don't need such a cable.

1. Turn on debugging with this command:
2. Configure the debugger to use COM1 with this command:

   bcdedit /dbgsettings SERIAL DEBUGPORT:1 BAUDRATE:115200

   Note that these are the default settings and already exist in most bcd stores.However setting them again won't damage anything, and guards against a situation where the dbgsettings have been previously modified.

3. Reboot so that the boot loader can read the new settings and configure the OS for debugging.

Next, configure Hyper-V to redirect the COM1 port to a named pipe.We will use this pipe in place of a traditional null modem cable.

1. Open Hyper-V Manager and browse to the settings page of the VM you configured to debug.
2. Change the Attachment to 'Named pipe:' and provide a pipe name.
   1. Note that the Hyper-V Manager provides the complete path to your named pipe.Make a note of this path as you will need it in the next step.

Named Pipe To Serial Port Hyper-v

After the OS and the VM are configured for debugging, we need to connect a debugger.

Named Pipe Serial Port Charlotte

1. On the Hyper-V parent partition download and install the Debugging Tools for Windows from http://msdn.microsoft.com/en-us/windows/hardware/gg463009.
2. After installing the debugging tools you will have a ‘Debugging Tools for Windows’ entry in your start menu.
   1. From this folder right click ‘WinDbg’ and choose ‘Run as administrator’. Windbg needs administrative rights to connect to the pipe.
3. In windbg open the File menu and choose ‘Kernel Debug’.
4. Enter a Baud Rate of 115200, to match the settings made in the VM.
5. Enter the Port that you configured in the VM settings page.
   1. To connect to the pipe remotely, substitute the '.' in the path with the Hyper-V server name.
6. Ensure that the Pipe and Reconnect boxes are checked.
7. Click OK to start debugging.
8. Windbg should display the string ' Waiting to reconnect..'

Named Pipe Serial Port Angeles

To test the debugger connection in windbg, from the ‘Debug’ menu choose ‘Break’.This should cause the server to break into the debugger and display a kd> prompt.Please note that breaking into the debugger will cause the OS running in the VM to halt until you tell the debugger to go, the OS will appear to be hung during this time.The command 'g' followed by Enter will tell the debugger to ‘go’ causing the VM to resume operation.