Sparkfuns' Open Logic Sniffer

Sparkfun sells a Logic sniffer which is a low cost OLS (Open Logic Sniffer) platform that supports the sump logic analyser software. It uses a FPGA connected to a usb to serial adapater, and this is where the problem lies. The drivers required for the usb to serial adapter do not work with Windows 8 as they are not signed. The following procedure will sign the drivers:

1. Obtain the driver to sign by downloading the ols software, found here. Either version (expert or full) contains the driver.
    
2. Modifications to the inf file are needed in order to use the usbser.sys driver provided by windows. Extract the archive and find the driver directory. Locate mchpcdc.inf and copy it to another directory (for example C:\drivers). Edit the copied version and make the following changes:
     [DestinationDirs]
   FakeModemCopyFileSection=12 //add
   DefaultDestDir=12
   ...
   [DriverInstall.nt]
   include=mdmcpq.inf
   CopyFiles=DriverCopyFiles.nt  //remove
   CopyFiles=FakeModemCopyFileSection //add
   AddReg=DriverInstall.nt.AddReg
   ...
   [DriverCopyFiles.nt]  //remove
   usbser.sys,,,0x20     //remove
   ...
   [DriverInstall.NTamd64]
   include=mdmcpq.inf
   CopyFiles=DriverCopyFiles.NTamd64 //remove
   CopyFiles=FakeModemCopyFileSection //add
   AddReg=DriverInstall.NTamd64.AddReg
      
3. The next steps sign the driver and require the Windows Driver Kit, found here.
    
4. If you have Visual Studio 2012, open a Developer Command Prompt as an administrator. Otherwise open a command prompt as an administrator and use the following if you are running 64 bit windows:
   
   set PATH=PATH;C:\Program Files (x86)\Windows Kits\8.0\bin\x64
     
   or if you are running 32 bit windows:
   
   set PATH=PATH;C:\Program Files\Windows Kits\8.0\bin\x86
    
   This adds the path of the tools needed for the driver signing. The Developer Command Prompt already has these paths setup.
    
5. The directory of the inf used in the following steps is in C:\drivers. The first step is to change the date of the driver in the inf using the following:
   
   C:\drivers>stampinf -f mchpcdc.inf -d 09/09/2012 -v 9.0.9999.0
   Stamping .\mchpcdc.inf [Version] section with
   DriverVer=09/09/2012,9.0.9999.0
    
   This sets the date of the driver so that it can be signed. The date needs to be newer than 21/04/2012 as we cannot sign software created before windows 8.
    
6. Next create a catalog file for the driver:
     C:\drivers>inf2cat /driver:. /os:8_X86,8_X64
   ....................
   Signability test complete.
   Errors:
   None
   Warnings:
   None
   Catalog generation complete.
    
7. A certificate is needed to sign the driver catalog, to create a certificate use:
    
   C:\drivers>Makecert -r -pe -ss PrivateCertStore -n "CN=TestCertforWDK" TestCert.cer
   Succeeded
    
   This creates the certificate to sign the driver catalog, it must now be added to the trusted certificates on the computer. This is what allows the driver to be installed as the certificate to sign the driver is also part of the trusted certificates on the computer. The following commands add the certificate to the root and to the trusted publishers:
    
   C:\drivers>certmgr.exe /add TestCert.cer /s /r localMachine root
   CertMgr Succeeded
   C:\drivers>certmgr.exe /add TestCert.cer /s /r localMachine trustedpublisher
   CertMgr Succeeded
    
8. The driver catalog can now be signed with the certificate created in the previous step, using the following:
    
   C:\drivers>Signtool sign /v /s PrivateCertStore /n TestCertForWDK /t http://timestamp.verisign.com/scripts/timestamp.dll mchpcdc.cat
   The following certificate was selected:
       Issued to: TestCertforWDK
       Issued by: TestCertforWDK
       Expires:   Sun Jan 01 12:59:59 2040
       SHA1 hash: ...
   Done Adding Additional Store
   Successfully signed and timestamped: mchpcdc.cat
   Number of files successfully Signed: 1
   Number of warnings: 0
   Number of errors: 0
    
9. The final step in signing the driver is to verify the driver catalog and associated inf, this is done using:
    
   C:\drivers>Signtool sign /v /s PrivateCertStore /n TestCertForWDK /t http://timestamp.verisign.com/scripts/timestamp.dll mchpcdc.cat
   The following certificate was selected:
       Issued to: TestCertforWDK
       Issued by: TestCertforWDK
       Expires:   Sun Jan 01 12:59:59 2040
       SHA1 hash: ...
   Done Adding Additional Store
   Successfully signed and timestamped: mchpcdc.cat
   Number of files successfully Signed: 1
   Number of warnings: 0
   Number of errors: 0
   C:\drivers>Signtool verify /pa /v /c mchpcdc.cat mchpcdc.inf
   Verifying: mchpcdc.inf
   File is signed in catalog: mchpcdc.cat
   Hash of file (sha1): ...
   Signing Certificate Chain:
       Issued to: TestCertforWDK
       Issued by: TestCertforWDK
       Expires:   Sun Jan 01 12:59:59 2040
       SHA1 hash: ...
   The signature is timestamped: Mon Feb 25 09:07:48 2013
   Timestamp Verified by:
       Issued to: Thawte Timestamping CA
       Issued by: Thawte Timestamping CA
       Expires:   Fri Jan 01 12:59:59 2021
       SHA1 hash: ...
           Issued to: Symantec Time Stamping Services CA - G2
           Issued by: Thawte Timestamping CA
           Expires:   Thu Dec 31 12:59:59 2020
           SHA1 hash: ...
               Issued to: Symantec Time Stamping Services Signer - G4
               Issued by: Symantec Time Stamping Services CA - G2
               Expires:   Wed Dec 30 12:59:59 2020
               SHA1 hash: ...
   Successfully verified: mchpcdc.inf
   Number of files successfully Verified: 1
   Number of warnings: 0
   Number of errors: 0
    
10. The driver is now signed. Right click on the mchpcdc.inf and click install. Next time the Open Logic sniffer is plugged in it should be detected and the correct driver installed.

This guide was based on these links:

http://www.microchip.com/forums/m488342.aspx

http://msdn.microsoft.com/en-nz/library/windows/hardware/ff547089(v=vs.85).aspx

http://stackoverflow.com/questions/10832499/workaround-to-skip-driver-signing-in-64bit-windows