Linux/AM5728: IPC example fails on DSP1

Tool/software: Linux

I am working on a GPEVM AM5728 rev. A3, with Processor SDK Linux and RTOS v4.03, IPC v3.47.01, and CCS v7.4

When trying to execute the IPC example "ex02_messageq" this only works on DSP2, IPU1, and IPU2 cores, but always fails on DSP1, issuing the following log:

root@am57xx-evm:~/ipc-starter# ./app_host DSP1
--> main:
--> Main_main:
--> App_create:
App_create: Failed opening MessageQ
<-- App_create:
<-- Main_main:
<-- main:

It was already reported in this thread, but there's no solution in there.

Any ideas... ?

Thanks,

Daniel