Xilinx zynq qspi

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qspi flash读写错误

在linux上尝试用fw_printenv获取环境变量发现crc错误，用dd+hexdump和uboot下读取的flash分区比较（uboot env print可显示环境变量的大小），发现有个别数据读取错误，这里使用了冗余环境变量分区，前面的9485 e1f7指示当前分区是否是有效的环境变量分区。

root@mwm:~# dd if=/dev/mtd1 of=1.txt bs=8K count=1
root@mwm:~# hexdump 1.txt 

ZynqMP> env print
autoload=no
baudrate=115200
Environment size: 7198/131067 bytes
ZynqMP> md.w ${clobstart} 0x2000            
10000000: 9485 e1f7 6101 7475 6c6f 616f 3d64 6f6e    .....autoload=no

检查设备树配置，

        spi@ff0f0000 {
            u-boot,dm-pre-reloc;
            compatible = "xlnx,zynqmp-qspi-1.0";
            status = "okay";
            clock-names = "ref_clk", "pclk";
            interrupts = <0x0 0xf 0x4>;
            interrupt-parent = <0x4>;
            num-cs = <0x1>;
            reg = <0x0 0xff0f0000 0x0 0x1000 0x0 0xc0000000 0x0 0x8000000>;
            #address-cells = <0x1>;
            #size-cells = <0x0>;
            #stream-id-cells = <0x1>;
            iommus = <0xe 0x873>;
            power-domains = <0x1e>;
            clocks = <0x3 0x35 0x3 0x1f>;
            is-dual = <0x1>;
            spi-rx-bus-width = <0x4>;
            spi-tx-bus-width = <0x4>;

            flash@0 {
                compatible = "n25q512a", "micron,m25p80";
                spi-tx-bus-width = <0x1>;
                spi-rx-bus-width = <0x4>;
                reg = <0x0>;
                #address-cells = <0x1>;
                #size-cells = <0x1>;
                /*spi-max-frequency = <0x66ff300>;*/
                spi-max-frequency = <0x337F980>;

                partition@0x00000000 {
                    label = "boot";
                    reg = <0x0 0x100000>;
                };

将总线频率降低一半，数据读取正确，rx-bus-width还是保持为4。