imx93 accessing MCU_BOOTROM_BASE_ADDR

Hi,

I'm trying to access the MCU_BOOTROM_BASE_ADDR register to preserve some value between SPL and u-boot (regarding DRAM memory size). Such a hack was used for imx8 and works perfectly fine, while reading MCU_BOOTROM_BASE_ADDR in SPL leads to the crash. Is there any peripheral which needs to be enabled to have MCU_BOOTROM_BASE_ADDR available? Thanks for any hints.

BR,

marek