STM32L4R5ZI has SRAM1 (0x20000000 - 0x2002FFFF) , SRAM2 (0x20030000 - 0x2003FFFF) and SRAM 3 (0x20040000 - 0x2009FFFF).I move VTOR table as per my Application Flash starting address. In code, I relocate Interrupt table to RAM for my own ISR handlers ...