AM263P4: Systemproject flashing+startup

Part Number: AM263P4
Other Parts Discussed in Thread: UNIFLASH

Tool/software:

Hey Experts,
ive problems with running my systemproject.

Iam using:

CCS 12.8.1.00005
SDK 10_00_00_35
Uniflash 9.1.0.5175
SBL: sbl_ospi_am263px-lp_r5fss0-0_nortos_ti-arm-clang (small adaptation because of differnet flash chip)

My systemproject contains a SW for core 0-0 and another sw for core 1-0. Both SW controll an individual LED with indicates me if the SW is running. 
When i flash my systemproject with Uniflash and make a power cycle, i can only see the LED from core 0-0 running. So SW for core 1-0 isn't running.
In a next step i tried to connect with my XDS110 debugger. I can connect to both cores. At core 1-0 i only need to hit the run bottom and its running now too.
So i asume flashing was successfull. But why doesn't the SW start by its own after powercycle?

You have any ideas how to fix or debug this problem?

Best regards,

Marcel