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  1. Hi there, This is my first posting on lava. A coworker pointed me here after I told him I had reached my limit trying to debug this hardware issue. I have a PMC device I am trying to test. The test plan calls for putting 2 of the devices on PMC-PCI adapter cards and installing them in a Windows PC, then running tests. When I put just one of the devices in the PC I didn't have a problem. I made a driver using NI's VISA driver wizard. And I was able to read from the PCI configuration and BAR0 address spaces of the device using the VISA test panel in MAX. However, when I plugged in the second DUT I started having a strange issue. I could still read from the configuration spaces from both devices, but one of the two DUTs always returned zero when I read from it's registers in the BAR0 address space, the other worked normally. No errors showed in Windows Device Manager. So far I found a workaround that gets both cards working, but I still haven't figured out the root of the problem. Power up the PC with both cards installed After Windows boots up, switch off the power on one of the PCI-PMC adaptor cards Then in the Windows Device Manager click the "Scan for hardware changes" button and check that one of the cards is gone Switch the carrier card back on "Scan for hardware changes" again and click through Windows' "Found new Hardware" dialogue to re-install the driver After that rigamarole both cards work untill I restart the PC. Does this issue sound familiar to anyone out there? Can you offer some suggestions for steps I should take for diagnosing PCI problems?
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