Other Parts Discussed in Thread: OMAP-L138
Tool/software:
What does the "--legacy" option do in the C6000 Code Generation Tools v8.3.12?
We have a collection of software projects for the C674x core of OMAP-L138 processors.
We have been using Code Composer Studio v6.1.2 and C6000 Code Generation Tools v7.4.14.
There are obstacles to updating our tool chain, so we froze the tool chain there for several years.
There was a push to update tool chains back around the time of Code Composer Studio v12.2.0 and C6000 CGT v8.3.12.
There were a few challenges to overcome.
There is at least one remaining challenge. At lease one of our C674x applications runs more slowly and blows a deadline. This results in a fault condition that requires user intervention to recover.
This particular application runs on two distinct hardware configurations. I will call them Configuration A and Configuration B.
The fault condition occurs on Configuration A with optimization level 1.
When I use optimization level 2, Configuration A runs well but Configuration B disrupts its communication channel and is taken offline.
When I use optimization level 1 but enable the --legacy option, I get several additional warnings, but the resulting software runs well on Configurations A and B.
Here is a table summarizing my observations so far:
| C6000 CGT version | --opt_level | --opt_for_speed | --legacy | Configuration A Issue | Configuration B Issue |
| v7.4.14 | 1 - Local Optimizations | 4 (default) | n/a | no issue observed | no issue observed |
| v8.3.12 | 1 - Local Optimizations | 4 (default) | (disabled) | faults due to missed deadlines | no issue observed |
| v8.3.12 | 1 - Local Optimizations | 5 | (disabled) | faults due to missed deadlines | no issue observed |
| v8.3.12 | 2 - Global Optimizations | 4 (default) | (disabled) | no issue observed | comm link dropped |
| v8.3.12 | 1 - Local Optimizations | 4 (default) | enabled | Many new compiler warnings. No run-time issue observed |
Many new compiler warnings. No run-time issue observed |
What does the "--legacy" option do in C6000 Code Generation Tools v8.3.12? I find no information about the "--legacy" option in SPRUI04F TMS320C6000 Optimizing C/C++ Compiler v8.3.x User's Guide.
It seems advantageous for us to figure out changes to make to this particular project to get C6000 CGTv8.3.x to build a usable executable binary file without the "--legacy" option.
We would be grateful for some guidance about the "--legacy" option to help us determine next steps.
