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TMS570LC4357: CRC Semi-CPU Mode IRQ not working

Part Number: TMS570LC4357

I try to verify the flash on the Hercules TMS570LC43x LaunchPad Development Kit and I read "Using the CRC Module on Hercules™-Based Microcontrollers".
I downloaded the example mentioned in the report. I tried the example "LC43 CRC SW Full-CPU and Semi-CPU Modes" and it works fine.
But I want to use "LC43 CRC Semi-CPU Mode IRQ" and this does not work. I never reach the while(1) and looping forever with the following output:
[CortexR5] Start CRC Calculation in Semi CPU Mode (IRQ based)
Checking CRC for address 0x00000000, 4 elements
P
Checking CRC for address 0x00000020, 3242 elements
P
Checking CRC for address 0x00006570, 97 elements
P
Checking CRC for address 0x00006878, 68 elements
P
Checking CRC for address 0x00000000, 4 elements
P
Checking CRC for address 0x00000020, 3242 elements
P
Checking CRC for address 0x00006570, 97 elements
P
Checking CRC for address 0x00006878, 68 elements
P
...and so on
The interesting thing is, the function crcSemiCpuMode() returns (checked with the Debugger), but nevertheless the while(1) part after that function call is never reached.
Why does this example not work? Is there something to configure?