Today's shining example of ST's platform BSP code, and I quote:
/* Change the switch matrix read issuing capability to 1 for the AXI SRAM target (Target 7) */
*((volatile uint32_t*)0x51008108) = 0x00000001;

That, my friends, is what we call a "notional comment." Like, I appreciate the effort, but holy crap, y'all.