It's an enumerated list of counts and sizes, should be apparent from table in binary
See also trailing comment here
STM32CubeProgrammer_v2.10\bin\ExternalLoader\IS61WV51216BLL_STM3210E-EVAL\Sources\Loader_Files\Dev_Inf.c
Related defines for attached file
#ifdef USE_S25HL01GT // 128MB
#define PART_NAME "S25HL01GT"
#define QSPI_FLASH_SIZE (128 * 1024 * 1024)
#define QSPI_FLASH_SHIFT 27
#define END_BLOCK 0x07FC0000 // 128MB-256KB-1
#define USE_SPANSION
#define USE_ADR32
//#define ERASE_BLOCK_SIZE (256 * 1024)
#define ERASE_BLOCK_SIZE (4 * 1024)
#define COMPLEX1_BLOCK_SIZE (4 * 1024)
#define COMPLEX1_BLOCK_COUNT 32
#define COMPLEX2_BLOCK_SIZE (128 * 1024)
#define COMPLEX2_BLOCK_COUNT 1
#define COMPLEX3_BLOCK_SIZE (256 * 1024)
#define COMPLEX3_BLOCK_COUNT 511
#endif
