Internal Error: Sub-system: ASM2, File: /quartus/comp/asm2/asm2_bcm_assemble.cpp, Line: 478

Due to a problem in the Intel® Quartus® Prime Pro Edition software version 19.4, you may see this internal error when runing the assembler for Intel® Stratix® 10 designs after running the update_mif flow using the following command:

quartus_cdb <project name> --update_mif

To work around this problem use the followng alternative flow to update your mif files.

1. Compile your design then make any required modifications to the project .mif files.
2. Create a file called eco.tcl in your project directory.
3. Add the following string to eco.tcl "update_mif_files" without the quotes.
4. Run the following command: quartus_fit --eco=eco.tcl <project name>
5. Run the assembler

This problem is fixed in the Intel® Quartus® Prime Pro Edition software version 20.1.