altera_pcie_a10_skp.sdc >> Error: Unable to find the parent of tx_serial_clk in 100 attempts! - altera_pcie_a10_skp.sdc >> Error: Unable to find the parent of tx_serial_clk in 100 attempts! Description You might see this warning message reported when compiling the Intel® Arria® 10 PCIe Hard IP core in Avalon® streaming mode in the Intel® Quartus® Prime Pro Edition Software version 17.1 and earlier. The warning occurs due a problem in the auto-generated sdc file. Resolution This problem is scheduled to be resolved in a future release of the Intel Quartus Prime Software. These warnings can be safely ignored. Custom Fields values: ['novalue'] Troubleshooting 487228 False ['Arria® 10 Cyclone® 10 Hard IP for PCI Express'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 17.1 17.0 ['Arria® 10 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']