Issue in probing QSPI flash in Cyclone V SOC

[Santhosh Kumar Janardhanam]

Hi All,
we are testing QSPI flash in Cyclone V custom board. The QSPI pins used are same like cyclone V sockit board.we are using uboot 2024.01
when we do sf probe, we got the below error. we have verified the pin mux configuration and also enabled the clock.

=> sf probe 0:0
jedec_spi_nor flash at 0: unrecognized JEDEC id bytes: ff, ff, ff
Failed to initialize SPI flash at 0:0 (error -2)

The DTS file contains the following entries

&qspi {
              status = "okay";

              flash: flash at 0 {
                             #address-cells = <1>;
                             #size-cells = <1>;
                             compatible = "n25q256a";
                             reg = <0>;
                             spi-max-frequency = <100000000>;

                             m25p,fast-read;
                             cdns,page-size = <256>;
                             cdns,block-size = <16>;
                             cdns,read-delay = <4>;
                             cdns,tshsl-ns = <50>;
                             cdns,tsd2d-ns = <50>;
                             cdns,tchsh-ns = <4>;
                             cdns,tslch-ns = <4>;
              };
};
The flash chip is connected in bus 0 and chipselect 0.
As anyone faced this issue earlier in uboot with cyclone V? can anyone guide what needs to be done to make sf probe working?

Regards,
Santhosh
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