Did you add the BRAM and BRAM controllers?
Make sure you select the correct masters. Then find it's address map- then replace the DDR_* with this address.
Will look something SIMILAR to this :-
BEGIN axi_bram_ctrl
PARAMETER INSTANCE = axi_bram_ctrl_0
PARAMETER HW_VER = 1.03.a
PARAMETER C_INTERCONNECT_S_AXI_MASTERS = processing_system7_0.M_AXI_GP1 & axi_vdma_0.M_AXI_MM2S
PARAMETER C_S_AXI_BASEADDR = 0x40000000
PARAMETER C_S_AXI_HIGHADDR = 0x4000ffff
BUS_INTERFACE S_AXI = axi_interconnect_4
BUS_INTERFACE BRAM_PORTA = axi_bram_ctrl_0_BRAM_PORTA
BUS_INTERFACE BRAM_PORTB = axi_bram_ctrl_0_BRAM_PORTB
PORT S_AXI_ACLK = processing_system7_0_FCLK_CLK0
END
BEGIN bram_block
PARAMETER INSTANCE = axi_bram_ctrl_0_bram_block_1
PARAMETER HW_VER = 1.00.a
BUS_INTERFACE PORTA = axi_bram_ctrl_0_BRAM_PORTA
BUS_INTERFACE PORTB = axi_bram_ctrl_0_BRAM_PORTB
END