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AM5728: IPC error

Part Number: AM5728

I've updated to version 06_01_00_08 and tried to run the IPC Quick Start Guide.

everything seems to build fine on the RTOS and linux side. When I run the following command I get this error:

root@am57xx-evm:~# ./app_host DSP1
--> main:
Ipc_start: LAD_connect() failed: 4
Ipc_start failed: status = -1
<-- main:

Even running the list command gave me a problem:

root@am57xx-evm:~# ./app_host -l
--> main:
Processor List
Ipc_start: LAD_connect() failed: 4
Error: main_host.c, line 198: Ipc_start failed
<-- main:

Any ideas what might be wrong?