Why is the eCPRI FPGA IP unable to run on hardware using Stratix® 10 E-Tile with the Nios® V Processor for FPGA and turn on the interworking function (IWF)?
Description Due to a problem in the eCPRI FPGA IP version 3.0.2 in the example design, you may find that there is an error shown at the 10G transaction after changing the dynamic reconfiguration process from 25G to 10G. Resolution There is currently no plan to fix this behavior in a future Quartus® Prime release.Why does the Nios® V processor fail to generate HDL with an add_fileset_file error message in Quartus® Prime Standard Edition from Windows* OS?
Description Due to a problem in the Quartus® Prime Standard Edition Software versions 22.1, 23.1, and 24.1, the Nios® V processor might fail to generate HDL with an error message about add_fileset_file. This issue is present only on Windows OS. Example error message: Error: add_fileset_file: No such file <Nios V processor SystemVerilog file> while executing “add_fileset_file $current_sim/<Nios V processor SystemVerilog file> SYSTEM_VERILOG PATH $current_sim/<Nios V processor SystemVerilog file> $attr” This is because the Nios® V processor hw.tcl is calling add_fileset_file on an unsupported simulator. These unsupported simulators are referring to simulators that are not supported in Windows* OS - Cadence Simulator and Synopsys VCS* and VCS MX. Resolution To work around this problem in the Quartus® Prime Standard Edition Software version 24.1, download and install the patches below. The problem has been fixed starting with Quartus® Prime Pro Edition software version 25.1.1 and Quartus® Prime Standard Edition software version 25.1. Additional Information For information on the simulators’ supported platforms, refer to the Quartus® Prime Standard Edition User Guide: Third-party Simulation - Supported Simulators.Why is no display output observed when using the VVP-Full Design Example version 24.2 in the Arria® 10 FPGAs?
Description Due to problems porting the Nios® II Processor design to the Nios® V Processor design in the Quartus® Prime Pro Edition Software version 24.2, the Arria® 10 FPGA VVP-Full Design Example does not work correctly; no output is displayed. Resolution The problem has been fixed starting with Quartus® Prime Pro Edition software version 25.1.1.Why does the Nios® V processor force Configuration Scheme with Memory Initialization for MAX® 10 FPGA?
Description Due to a problem in the Quartus® Prime Standard Edition Software version 23.1 and 24.1, you may see an error below when using Dual Compressed Image as the Internal Configuration mode for Nios® V Processor Design on MAX® 10 FPGA, Error (16031): The current Internal Configuration mode does not support memory initialization or ROM. Select Internal Configuration mode with ERAM. Note: Assuming that memory initialization is disabled in every on-chip memory. Resolution To work around this problem, Download and install the patches below for the Quartus® Prime Standard Edition Software version 24.1. Quartus® Prime Stardand Edition Software v24.1 Patch 0.01std for Windows (.exe) Quartus® Prime Stardand Edition Software v24.1 Patch 0.01std for Linux (.run) Readme for Quartus® Prime Stardand Edition Software v24.1 Patch 0.01std (.txt) Download and install the patches below for the Quartus® Prime Standard Edition Software version 23.1. Quartus® Prime Stardand Edition Software v23.1 Patch 0.03std for Windows (.exe) Quartus® Prime Stardand Edition Software v23.1 Patch 0.03std for Linux (.run) Readme for Quartus® Prime Stardand Edition Software v23.1 Patch 0.03std (.txt) The problem has been fixed starting with Quartus® Prime Standard Edition software version 25.1,
Why does Nios® V/g processor experiences data corruption when it is enabled with TCM and ECC?
Description Due to a problem in the Quartus ® Prime Pro Edition Software version 26.1, data corruption might occur in Nios ® V/g processor designs with tightly coupled memory (TCM) and error correction code (ECC). Both features must be enabled to observe this problem. It is caused by an RTL bug in the processor, which renders failure when the processor executes sw (store word), followed by sh (store halfword) or sb (store byte) instructions. For example, # Initially, value of Y is 0x0001CCCC. li t0, 0x12345678 li t1, 0x200A sw t0, 0(Z) # Store 0x12345678 word into Z sh t1, 0(Y) # Store 0x200A into lower half of Y Result Final value of Y Description Expected 0x0001200A Upper-half of Y is preserved as 0x0001, while lower-half of Y is changed to 0x200A. Actual (Data Corruption) 0x1234200A Upper-half of Y is corrupted to 0x1234, while lower-half of Y is changed to 0x200A. The 0x1234 is from the previous Store Word (sw) instruction. Resolution To work around this problem in the Quartus ® Prime Pro Edition Software version 26.1, apply either one of the solutions below: Disable TCM. Disable ECC. This problem is scheduled to be fixed in a future release of the Quartus ® Prime Pro Edition Software.Why does Ashling* RiscFree* IDE for Altera FPGAs software version 25.4.1 turns compiler warnings into errors?
Description In the Ashling* RiscFree* IDE for Altera FPGAs software version 25.4.1 (31 st Oct 2025) and later, you might see compilation error related to the following errors: Implicit int types (-Werror=implicit-int) Implicit function declarations (-Werror=implicit-function-declaration) Typos in function prototypes (-Werror=declaration-missing-parameter-type) Incorrect uses of the return statement (-Werror=return-mismatch) Using pointers as integers and vice versa (-Werror=int-conversion) Type checking on pointer types (-Werror=incompatible-pointer-types) This is due to an update in GCC 14 – GNU: Certain warnings are now errors, which affects future GCC versions. For more information, Ashling* RiscFree* IDE for Altera FPGAs software version 25.3.1 (1 st August 2025) is using GCC 13.2. Ashling* RiscFree* IDE for Altera FPGAs software version 25.4.1 (31 st Oct 2025) is using GCC 15.2. Thus, Ashling* RiscFree* IDE for Altera FPGAs software version 25.4.1 (31 st Oct 2025) and future versions are affected. Note that Ashling* RiscFree* IDE for Altera FPGAs software version 25.4.1 (31 st Oct 2025) is paired with Quartus ® Prime Pro Edition software version 26.1. Resolution GNU recommends resolving all the new errors for better code quality. If necessary, you may refer to the workaround – GNU: Turning errors back into warnings. In Board Support Package Editor, add "-fpermissive" in hal.make.cflags_user_flags.Why are the peripherals under 2GB Peripheral Region still cached by the Nios® V/g processor?
Description Due to a problem in the: Quartus® Prime Pro Edition Software version 23.1, 23.2, 23.3, 23.4, 24.1, 24.2, 24.3, 24.3.1, 25.1 Quartus® Prime Standard Edition Software version 23.1, 24.1 The Nios® V/g processor still caches the peripherals if they are placed under a Peripheral Region that is configured to 2GB, regardless of the Base Address. This is due to a problem in the processor RTL failing to correctly implement the 2GB Peripheral Region. Other Peripheral Region sizes are not affected; only 2GB is affected. Resolution To work around this problem, please select other Peripheral Region sizes except 2GB. The Nios® V/g processor still offers Peripheral Region sizes ranging from 64KB to 1GB. The 2GB Size option for Nios® V/g processor Peripheral Region is removed beginning with the Quartus® Prime Pro Edition Software version 25.1.1 and Quartus® Prime Standard Edition Software version 25.1. Related Article NIOS V/g - peripherals under 2GB Peripheral Region | Altera Community - 350829Errors: 'MODULAR_ADC_0_DUAL_ADC_MODE' undeclared here (not in a function)
Description Due to a problem with the Quartus® Prime Standard Edition Software version 21.1, when Modular ADC Core IP used in a Nios® II Gen 2 system, you might see the following errors when building the Nios® II software project: 'MODULAR_ADC_0_DUAL_ADC_MODE' undeclared here (not in a function) 'MODULAR_ADC_0_IRQ_INTERRUPT_CONTROLLER_ID' undeclared here (first use in this function) 'MODULAR_ADC_0_IRQ' undeclared here (first use in this function) 'MODULAR_ADC_0_NAME' undeclared here (not in a function) Resolution To work around this problem, the altera_modular_adc.h file located in \intelFPGA\21.1\ip\altera\altera_modular_adc\top\HAL\inc needs to be replaced with a new one. Download the driver.zip file to obtain the updated altera_modular_adc.h file. This problem is scheduled to be fixed in the Quartus® Prime Standard Edition Software version 22.1 and later versions.Why does downloading ELF file into Nios® V/g processor fail when disabled branch prediction, while enabled instruction cache?
Description Due to a problem in the Quartus ® Prime Pro Edition Software version 25.3.1, downloading ELF file into Nios ® V/g processor might fail when both the conditions below are fulfilled. Branch prediction is disabled, and Instruction cache is enabled The niosv-download command returns the error message below. Unexpected vCont reply in non-stop mode: E30 ERROR: GDB failed. This is because there is an RTL bug in the instruction cache related to its reset state. Resolution To work around this problem in the Quartus ® Prime Pro Edition Software version 25.3.1, Either enable branch prediction, Or disable instruction cache This problem is scheduled to be fixed in a future release of the Quartus ® Prime Pro Edition Software version 26.1.Why does Ashling* RiscFree* IDE for Altera* FPGA software reports unresolved inclusion warnings, despite a successful build of Nios® V processor software project?
Description Due to a problem in multiple versions of Ashling* RiscFree* IDE for Altera® FPGA, the unresolved inclusion warning might occur for any Nios ® V processor software projects. Note that, the warning is harmless. The affected software project will still build successfully. This is caused by a bug in the Indexer of Ashling* RiscFree* IDE, which fails to search for the relevant project files. The affected Ashling* RiscFree* IDE for Altera FPGA are: Software version v25.1.1 (dated as 31 st Jan 2025) Software version v25.2.1 (dated as 9 th May 2025) Software version v25.3.1 (dated 1 st August 2025) Resolution This problem is currently scheduled to be resolved in future release of Ashling* RiscFree* IDE for Altera FPGA software version v26.1.0 (dated as 19 th Dec 2025). Meanwhile, you may safely ignore this warning, as it does not affect the functionality of your project. If needed, please refer to the related article for the recommended workaround. Related Article: Ahsling RiscFree IDE 25.1.1: Unresolved inclusion | Altera Community