multiple flash storage devices on stm32

[AndreoBotelho]

Hi, I'm working on a stm32 firmware for a custom project using the STM32H743 MCU without external RAM, due to the low ram of the device I would like to use the part of the internal flash to store bmp images on a flash device and load direct to the screen, I've configured the external QSPI flash to a device mapped to memory and use as storage but it is a little slow to load images. The boards configuration on the source disable access to internal flash for storage when using a external one, how can I use the 512kb internal flash reserved space as data storage alog with the external?