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TUSB7340: PCIe Swing, De-mphasis, Equalization registers

Part Number: TUSB7340

Hello,

We designed a board with a TUSB7340 and are having trouble with some cables.  We would like to modify these registers to see the effect.  I saw older locked post about a utility to modify the registers.  Can it be modified via standard PCIe reads/writes through linux or do I need the utility.  If so where can i find the utility.  

Thank You,