C2000 Hex Utility questions

One more question, how do you fill a hex file with 0xFF?

Hello -- I'm not sure if your question pertains to basic functionality of the hex utility, or how to configure operations within Code Composer Studio?  For the former, the use of the "-image" operation is documented in the C28x Assembly Language Tools guide as well as how to specify the fill value, but there are some documented limitations you have to follow. Please search the C28x assembly tools manual for the sub-chapter titled "Image Mode and the --fill Option".  Each of these options is reflected in the configuration above.