Method (_PDC, 1, NotSerialized)
        {
            CreateDWordField (Arg0, 0x08, CAP0)
            Store (CAP0, PDC0)
            If (LAnd (And (CFGD, 0x4000), LEqual (And (PDC0, 0x0A
                ), 0x0A)))
            {
                If (And (CFGD, 0x03))
                {
                    OperationRegion (IST0, SystemMemory, DerefOf (Index (SSDT, 0x01)), DerefOf (Index (SSDT, 0x02
                        )))
                    Load (IST0, HI0)
                }

                If (And (CFGD, 0x10))
                {
                    OperationRegion (CST0, SystemMemory, DerefOf (Index (SSDT, 0x07)), DerefOf (Index (SSDT, 0x08
                        )))
                    Load (CST0, HC0)
                }
            }

        }
    }

And CST0, IST0 defined as

        Name (SSDT, Package (0x0C)
        {
            "CPU0IST ", 
            0x00000000, 
            0x4F7F9B70, 
            "CPU1IST ", 
            0x00000000, 
            0x4F7F9B70, 
            "CPU0CST ", 
            0x4F7D465C, 
            0x000001D8, 
            "CPU1CST ", 
            0x00000000, 
            0x4F7F9B70
        })

So, inspite of proper _PDC, somehow CPU0CST is not getting loaded, looks like. My suspicion is CFGD value is changed. Can anyone from Dell please comment on CFGD value for this platform and why it is not loading CST0 in this case.

Thanks,

Venki