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Zephyr application gets stuck after enabling MCO1 on stm32n657X0

romanx
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I'm using zephyr sysbuild approach to get mcuboot along with the application (application runs in XIP mode)
I see that application proceeds to some point; I presume to the point where I enable MCO 

LL_RCC_EnableMCO(LL_RCC_MCO1)

And then it gets stuck, since I'm not able to attach gdb yet, I'm not sure where to dig
Kindly appreciate any help here
Seems that it interferes with other clock subsystems, but don't know which
I haven't found anything in errata yet
Please advise, thank you

EDIT: Although I'm able to see MCO pin (PA8) toggling with the desired frequency, which means SEL and PRE DIV were ok 

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