Making Quartus II 2.2 and 4.0 coexist Options

[RalphBodenner]

I keep several versions of Quartus II on my development machine for testing and have had to do some tricks to keep them all working without interfering with each other. If you're using SOPC Builder under Quartus II 4.0 and have either Quartus II 2.2 or the Nios embedded processor, version 3.0, installed on your system, you may have to do the following if you see errors about missing GNU tools (grep, chmod, etc.) when generating an SOPC Builder system:

- Run regedit and open the key "HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2 c__quartus4_0_bin_cygwin_bin_cygwin1_dll"
- Add a subkey called "/" and add the following values to this subkey:
- Add a DWORD value called "flags" and change its value to 0xa
- Add a String value called "native" and change its value to "C:\quartus4.0\bin\cygwin"

This is assuming you've installed Quartus 4.0 in C:\quartus4.0 and 2.2 in C:\quartus2.2. (Each version of Quartus must be installed in its own directory.)

This "fix" is not approved by Altera, but as they say, It Works For Me ™.