Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/NXP Semiconductors/NeoM3/LCD/UPBASE#0x0
Upper Panel Frame Base Address register
Reserved. Read value is undefined, only zero should be written.
LCD upper panel base address. This is the start address of the upper panel frame data in memory and is doubleword aligned.
https://github.com/cmsis-svd/cmsis-svd-data