1.4. Known Issues and Workarounds
This section provides information about known issues that affect the Intel® FPGA SDK for OpenCL™ and the Intel® FPGA RTE for OpenCL Version 22.4.
Description | Workaround |
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When compiling an OpenCL™ kernel containing calls to library functions containing HLS tasks, incremental compile may trigger recompilation for unaffected kernels. | No known workaround. However, this is not a functional bug. It may result in a more conservative incremental compile. |
The emulator runtime emits an assertion error if a kernel is enqueued 16,000 times. | Do not enqueue a kernel more than 16,000 times. |
OpenCL™ kernels with names longer than 61 characters might fail in the Intel® Quartus® Prime Pro Edition compiler with an error similar to the following error:
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Reduce the size of the OpenCL™ kernel name. |
OpenCL™ kernel pipes cannot be passed as arguments in some cases. The symptom is the runtime receives a CL_INVALID_BUFFER_SIZE (-61) error when you enqueue your kernel. | Modify your design to use channels instead of pipes. |
When alternatively using sub-buffers and their parent buffers, changes written to one might not be reflected in the other. | Unmapping and mapping a buffer forces the sub-buffers and their parent buffers to be synced. Unmapping and mapping a buffer between buffer uses should prevent this issue. |
This section provides information about known issues that affect the current release of the Intel® FPGA SDK for OpenCL™ Custom Platform Toolkit and Reference Platforms. These issues might also affect Custom Platforms you create for use with the Intel® FPGA SDK for OpenCL™ .
Description | Workaround |
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For Windows, when the host application queries the number of devices, calls to clGetDeviceIDs return 128 devices regardless of the actual number of devices present.
Note: You can find the actual available devices at the beginning of the device list returned by clGetDeviceIDs.
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Perform one of the following workarounds:
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Latest Known Intel® FPGA SDK for OpenCL™ Software Issues
For additional known issue information for the current Intel® FPGA SDK for OpenCL™ version and for previous versions, refer to the Knowledge Base web page.