Initializing the HDP on STM32N6

I wanted to use the HDP (Hardware Debug Port) peripheral on the STM32N6 MCU (Nucleo N6 board), but CubeMX does not generate the MX_HDP_Init() function for it and does not initialize the peripheral either.

Based on the reference manual, I tried configuring the peripheral at the register level but was unsuccessful.
My example:

LL_APB4_GRP1_EnableClock(LL_APB4_GRP1_PERIPH_HDP);
*(uint32_t*)(HDP_BASE_NS + HDP_MUX) = 0xffffffffUL;
*(uint32_t*)(HDP_BASE_NS) |= 0x1UL;
*(uint32_t*)(HDP_BASE_NS + HDP_GPOSET) = 0xff;

uint32_t hdpval = *(uint32_t*)(HDP_BASE_NS + HDP_VAL); // read back the HDP_VAL register

My question is: how can I enable the "(from BSEC) HDPEN" signal shown in the diagram below?

Thanks:

Peter

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