} >SRAM1 AT> FLASH
Fields of this means:
SRAM1 means that this section (in this case data). will be located in SRAM1 memory region.
FLASH means that this section will be loaded into FLASH memory region.
Startup will (must) copy this section from flash to SRAM1.
To place CODE into ITCM flash is enought to add new memory region and locate .text into this region. load region depend on if your programing tool can program itcm region.