Updating BIOS

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Downloading and installing the latest version

The latest version of DSP/BIOS can be downloaded from here. Download and run the executable to install BIOS on your computer.

Selecting a different version of BIOS in Code Composer Studio 3.x

You can install multiple versions of BIOS on a given PC, but ultimately the version being used will be dependent upon what is selected in the Component Manager.

Go to Help -> About -> Component Manager.
There you can change your DSP/BIOS version for your ISA (e.g. TMS320C64XX).
Go to File -> Save, then File -> Exit in the Component Manager.
Close CCS.
(Optional though recommended) Check your Windows environment variables and check that your BIOS_INSTALL_DIR variable points to the version you chose in Component Manager.
Restart CCS. The Help -> About should reflect the proper version.

Installing a new version of BIOS in CCS 4.x

Install the desired version of DSP/BIOS from here.
In CCS, go to Window -> Preferences
In the upper left pane go to CCS -> RTSC -> Products
Click the "Add" button in the upper right hand corner
Browse to the directory where DSP/BIOS is installed and click OK.
Restart the workbench for the changes to take effect.

Selecting a different version of BIOS in Code Composer Studio 4.x

In CCS 4.x the BIOS version is selected as part of the project:

Right-click on the project and choose "Build Properties..."
In the upper left corner click "CCS Build"
In the bottom of the "General" tab is an option for DSP/BIOS support where you can choose from previously installed versions

Cautions

You should avoid having any hard-coded paths to BIOS in your project options. CCS will automatically pass the proper paths to the compiler/linker based on the version that is selected. In other words, it's not necessary to have a preprocessor path pointing to the BIOS include directory because CCS will automatically pass that to the compiler for you.