cl::Platform::getDevice() returning error for hardware platform - cl::Platform::getDevice() returning error for hardware platform My app finds the device platforms that include the a10_ref emulator and (presumably) the actual hardware. But in the host code, when the platform is queried for devices, only the emulator is returning a valid device. I get an error code returned from getDevices() using the hardware platform instance. I also am seeing this: $ aocl list-devices -------------------------------------------------------------------- Warning: No devices attached for package: /home/okramer/intelFPGA_pro/19.3/hld/board/a10_ref -------------------------------------------------------------------- Here is the output from the print_platform_info() host utility function: Number of Platforms: 4 Platform Number: 0 Platform Name: Intel(R) FPGA Emulation Platform for OpenCL(TM) Platform Profile: EMBEDDED_PROFILE Platform Version: OpenCL 1.0 Intel(R) FPGA SDK for OpenCL(TM), Version 19.2 Platform Vendor: Intel(R) Corporation Platform Number: 1 Platform Name: Intel(R) FPGA SDK for OpenCL(TM) Platform Profile: EMBEDDED_PROFILE Platform Version: OpenCL 1.0 Intel(R) FPGA SDK for OpenCL(TM), Version 19.3 Platform Vendor: Intel(R) Corporation Platform Number: 2 Platform Name: Intel(R) CPU Runtime for OpenCL(TM) Applications Platform Profile: FULL_PROFILE Platform Version: OpenCL 2.1 LINUX Platform Vendor: Intel(R) Corporation Platform Number: 3 Platform Name: NVIDIA CUDA Platform Profile: FULL_PROFILE Platform Version: OpenCL 1.2 CUDA 10.2.95 Platform Vendor: NVIDIA Corporation When I select platform 0 (emulator), I can successfully call platform.getDevices(). The output of print_device_info() is: Number of Devices in Platform: 1 Device Number: 0 Device Name: Intel(R) FPGA Emulation Device Device Vendor: Intel(R) Corporation Is Device Available?: 1 Is Device Little Endian?: 1 Device Max Compute Units: 20 Device Max Work Item Dimensions: 3 Device Max Work Group Size: 67108864 Device Max Frequency: 3500 Device Max Mem Alloc Size: 33715263488 However, when I select platform 1, platform.getDevices() returns -1 with an empty device list. What could the problem be? I have an Arria 10 GX dev kit plugged into the PCIe and USB of an Ubuntu 16.04 machine. Below is the host code snippet fetching platform and device: bool getContextAndDevices(const std::string& mode, cl::Platform& platform, cl::Context& context, std::vector<cl::Device>& DeviceList) { cl_int err; // Set up map with mode-string as key and search-string as value for searching instance // of platform in platform listing. Not sure about "sim" but not using yet: std::map<std::string, std::string> platformNames; platformNames.insert({"emu","Emulation"}); platformNames.insert({"sim","CPU"}); platformNames.insert({"hw","SDK"}); // Get list of available platforms: std::vector<cl::Platform> PlatformList; err = cl::Platform::get(&PlatformList); checkErr(err, "Get Platform List"); checkErr(PlatformList.size()>=1 ? CL_SUCCESS : -1, "cl::Platform::get"); print_platform_info(&PlatformList); // Look for desired platform by searching platform names using unique id string in map: uint current_platform_id = get_platform_id_with_string(&PlatformList, platformNames.find(mode)->second.c_str()); printf("Using Platform: %d\n\n", current_platform_id); platform = PlatformList[current_platform_id]; // Fetch devices associated with this device. Works for "emu" but fails for "hw": //err = platform.getDevices(CL_DEVICE_TYPE_ACCELERATOR, &DeviceList); err = platform.getDevices(CL_DEVICE_TYPE_ALL, &DeviceList); checkErr(err, "Get Devices"); print_device_info(&DeviceList); //Create Context context = cl::Context(DeviceList, NULL, NULL, NULL, &err); checkErr(err, "Context Constructor"); return true; } Replies: Re: cl::Platform::getDevice() returning error for hardware platform I'm running Ubuntu 16.04. It must have been a faulty or corrupted install. It works now. Replies: Re: cl::Platform::getDevice() returning error for hardware platform You should do these steps after every hard reboot (dev kit card doesn't save drivers after power switch off) Replies: Re: cl::Platform::getDevice() returning error for hardware platform Hi okramer , What's the kernel version of your Ubuntu? I've reproduce you issue, pls try my command line instruction (you have to use your Quartus version in commands): 1. Check if card connected by USB: " lsusb|grep Altera " 2. Go to .../intelFPGA_pro/18.1/quartus/bin and make "sudo killall -9 ./jtagd" sudo ./jtagd 3 . /jtagconfig 4 ./jtagconfig --setparam 1 JtagClock 6M 5 . /jtagconfig --getparam 1 JtagClock 6. Uncompress the following file .../intelFPGA_pro/18.1/hld/board/a10_ref/bringup/a10_ref_initialization.tgz to a temporary location 7. In tmp folder: .../intelFPGA_pro/18.1/quartus/bin/quartus_pgm -l 8. .../intelFPGA_pro/18.1/quartus/bin/quartus_pgm -c 1 -m JTAG -o "p;max5_150.pof@2" 9. .../intelFPGA_pro/18.1/quartus/bin/quartus_pgm -c 1 -m JTAG -o "p;top.sof" 10. sudo reboot ( It must be soft reboot! ) 11. Do "lspci". Altera device should be in PCI list of devices. 12. Go to .../intelFPGA_pro/18.1/hld and do "source init_opencl.sh". 13. Go to .../intelFPGA_pro/18.1/hld/bin and do "sudo aocl install". 14. sudo reboot. ( soft reboot! ) After reboot do source init_opencl.sh 15. Check the card status via "aocl diagnose". Check the temperature of the card. 16. Test PCI-E speed via "aocl diagnose all". Replies: Re: cl::Platform::getDevice() returning error for hardware platform Hi, This error might be due to the reason as below: Installation not successful or The computer processing instruction interrupt the installation or The file/path to install driver is not available while install the driver. Thanks Replies: Re: cl::Platform::getDevice() returning error for hardware platform I found the problem was that the board installation (via "aocl install") was somehow defective. I had to uninstall and reinstall the a10_ref board and now I can see the device. Is it normal for the board installation to be corrupted somehow?