Why does reconfiguration of the Hard Processor System (HPS) over JTAG fail for Intel Agilex® 7 and Intel® Stratix® 10 devices after a corrupted bitstream has been loaded through U-boot? - Why does reconfiguration of the Hard Processor System (HPS) over JTAG fail for Intel Agilex® 7 and Intel® Stratix® 10 devices after a corrupted bitstream has been loaded through U-boot? Description Due to a known problem in the Intel® Quartus® Prime Pro Edition Software version 20.3, loading a corrupted bitstream through U-boot on Intel Agilex® 7 and Intel® Stratix® 10 devices will create an error state that prevents reconfiguration of the Hard Processing System (HPS) over JTAG. You might see the following error messages when attempting to reconfigure the HPS over JTAG with a good bitstream: Error (18939): Unexpected error in JTAG server: JTAG chain broken Error (18947): Device not responding Resolution If a corrupted HPS bitstream is loaded through U-boot, you can work around this problem by power cycling the device. This will allow you to reconfigure the HPS over JTAG with a good bitstream successfully. This problem is fixed starting with the Intel® Quartus® Prime Pro Edition Software version 20.4. Custom Fields values: ['novalue'] Troubleshooting 1508344257 False ['JTAG to Avalon Master Bridge IP'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 20.4 20.3 ['Agilex™ 7 FPGAs and SoCs', 'Stratix® 10 SX FPGA'] ['novalue'] ['novalue'] ['novalue']