The error:
cygheap base mismatch detected - 0xECD408/0x10ED408. This problem is probably due to using incompatible versions of the cygwin DLL.
means multiple versions of cygwin1.dll are loaded into your system, which confuses Cygwin-based tools (like Nios II tools in Quartus).
How to Fix
- Search for All cygwin1.dll Files
- Use Windows File Explorer or command prompt - dir /s /b cygwin1.dll Or search for cygwin1.dll in "This PC".
- Keep Only the One in Quartus Directory
- For Intel FPGA (Quartus), the correct DLL is usually in: C:\intelfpga_lite\18.1\quartus\bin64\cygwin\bin\
- Delete or rename any other copies found elsewhere (e.g., C:\cygwin\bin, C:\Windows\System32, other software folders).
- Reboot Your PC
- After deleting extra DLLs, restart Windows to ensure no stray DLL is loaded in memory.
- Try Again
- Rerun your Nios II Application and BSP creation process.
Additional Tips
- Don’t have Cygwin installed separately if you’re only using it through Quartus.
- If you use other software that relies on Cygwin, make sure their paths don’t interfere with Quartus’s version.
- If you still have issues, try running the Quartus/Nios II command shell as Administrator.
Thanks.
New Contributor
