List of files: 
 arm-trusted-firmware
       FW_config : <PATH>/arm-trusted-firmware/fwconfig/stm32mp257f-phyflex-fpsc-g-som-fw-config-optee-emmc.dtb
         BL31_fw : <PATH>/arm-trusted-firmware/bl31/tf-a-bl31-stm32mp257f-phyflex-fpsc-g-som-optee-emmc.bin
        BL31_dtb : <PATH>/arm-trusted-firmware/bl31/stm32mp257f-phyflex-fpsc-g-som-bl31-optee-emmc.dtb
          DDR_fw : <PATH>/arm-trusted-firmware/ddr/ddr_pmu-stm32mp257f-phyflex-fpsc-g-som-optee-emmc.bin
 optee-os
    Optee_header : <PATH>/optee/tee-header_v2-stm32mp257f-phyflex-fpsc-g-som-optee.bin
     Optee_pager : <PATH>/optee/tee-pager_v2-stm32mp257f-phyflex-fpsc-g-som-optee.bin
  Optee_pageable : <PATH>/optee/tee-pageable_v2-stm32mp257f-phyflex-fpsc-g-som-optee.bin
 U-Boot  
       U-BOOT_FW : <PATH>/u-boot/u-boot-nodtb-stm32mp25-default.bin
      U-BOOT_dtb : <PATH>/u-boot/u-boot-stm32mp257f-phyflex-fpsc-g-som-default.dtb
Fip tool command:
CMD> fiptool create   \ 
	--fw-config <PATH>/arm-trusted-firmware/fwconfig/stm32mp257f-phyflex-fpsc-g-som-fw-config-optee-emmc.dtb \ 
	--soc-fw <PATH>/arm-trusted-firmware/bl31/tf-a-bl31-stm32mp257f-phyflex-fpsc-g-som-optee-emmc.bin \ 
	--soc-fw-config <PATH>/arm-trusted-firmware/bl31/stm32mp257f-phyflex-fpsc-g-som-bl31-optee-emmc.dtb \ 
	--ddr-fw <PATH>/arm-trusted-firmware/ddr/ddr_pmu-stm32mp257f-phyflex-fpsc-g-som-optee-emmc.bin \ 
	--tos-fw <PATH>/optee/tee-header_v2-stm32mp257f-phyflex-fpsc-g-som-optee.bin \ 
	--tos-fw-extra1 <PATH>/optee/tee-pager_v2-stm32mp257f-phyflex-fpsc-g-som-optee.bin \ 
	--tos-fw-extra2 <PATH>/optee/tee-pageable_v2-stm32mp257f-phyflex-fpsc-g-som-optee.bin \ 
	--nt-fw <PATH>/u-boot/u-boot-nodtb-stm32mp25-default.bin \ 
	--hw-config <PATH>/u-boot/u-boot-stm32mp257f-phyflex-fpsc-g-som-default.dtb   \ 
	<PATH>/fip/fip-stm32mp257f-phyflex-fpsc-g-som-optee-emmc.bin