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For the SoCs that support configurable MMU page size, it is possible that the bootloader and application are built with different MMU page size configuration. This mismatch is not supported at the moment and application verification fails (at bootup or during OTA update). Configuring MMU page size helps to optimize the flash space by having smaller alignment and padding (secure) requirements. Please note that the MMU page size is tied with the flash size configuration at the moment (`ESPTOOLPY_FLASHSIZE_XMB`). This MR ensures that application verification happens using the MMU page size configured in its binary header. Thus, bootloader and application can now have different MMU page sizes and different combinations shall be supported.