Thorsten,
I was able to create a project for TI814x for A8 on my CCS with the exact same components as you. However, instead of creating a project using the TI compiler and then moving to use Linaro, I simply created it directly.
- Menu File --> New --> CCS Project
- Selected the Device as TI814x [Cortex A]
- Expanded Advanced settings and selected GNU v4.7.3 in the Compiler version drop-down menu
- Expanded Project templates and examples and selected SYSBIOS --> GNU Target Examples --> Typical
- Clicked Next. In this screen, the Target is already pre-populated with gnu.targets.arm.A8F.
- I selected the Platform as ti.platforms.evmTI814X.
- Clicked Finish and built the project with no errors.
Hope this helps,
Rafael