Data read write from cyclone 5 soc fpga using Lightweight AXI Bridge using uboot2020.07

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I am using De10 nano board with cyclone 5 socfpga, I want to read and write data from uboot c application from fpga using LWIP AXI bridge 0xff200000 Base address. I tried by enabling bridge from uboot and md mw commands, not able to read any data from fpga address. Programmed the fpga rbf file.