Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7rs/STM32H7R/GFXMMU/GFXMMU_LUT4H#0x0
GFXMMU LUT entry 4 high
Line offset Line offset of line number x expressed in number of blocks
https://github.com/modm-io/cmsis-svd-stm32