【ZYNQ开发板】文档Linux指令补充

磕磕碰碰

在进行ZYNQ的Linux部分开发过程中，由于在教程PDF中复制长指令会在指令后加换行导致指令无法正确执行，在本贴中贴出其中容易出错的指令供读者使用。

**4.2.3 修改设备树文件**

删除创建的文件中的内容，添加以下内容。添加完成之后点击保存并退出。

[C#] 纯文本查看 复制代码

/*
 * CAUTION: This file is automatically generated by Xilinx.
 * Version:  
 * Today is: Fri Sep 10 16:14:05 2021
 */

/dts-v1/;
#include "zynq-7000.dtsi"
#include "pcw.dtsi"
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/input/linux-event-codes.h>

#define GPIO_ACTIVE_HIGH   0
#define GPIO_ACTIVE_LOW    1

/ {
    model = "ACZ702 ZYNQ Development Board";
    chosen {
    bootargs = "console=ttyPS0,115200 earlyprintk root=/dev/mmcblk0p2 rw rootwait";
    stdout-path = "serial0:115200n8";
    };

    aliases {
        ethernet0 = &gem0;
        serial0 = &uart1;
        spi0 = &qspi;
    };
    memory {
        device_type = "memory";
        reg = <0x0 0x20000000>;
    };

    leds {
        compatible = "gpio-leds";
        led0 {
            label = "ps_led";
            gpios = <&gpio0 7 GPIO_ACTIVE_HIGH>;
            default-state = "on";
        };
    };

    keys {
        compatible = "gpio-keys";
        autorepeat;
        key0 {
            label = "ps_key";
            linux,code = <KEY_1>;
            gpios = <&gpio0 47 GPIO_ACTIVE_LOW>;
            debounce-interval = <15>;
        };
    };
};

&gem0 {
    phy-handle = <&ethernet_phy>;
    local-mac-address = [00 0a 35 00 1e 53];
    ethernet_phy: ethernet-phy@1 { 
        reg = <0x1>;
        device_type = "ethernet-phy";
    };
};

&qspi {
        #address-cells = <1>;
        #size-cells = <0>;
        flash0: flash@0 {
                compatible = "n25q128a","micron,m25p80";
                reg = <0x0>;
                #address-cells = <1>;
                #size-cells = <1>;
                spi-max-frequency = <50000000>;
                partition@0x00000000 {
                        label = "boot";
                        reg = <0x00000000 0x00500000>;
                };
                partition@0x00500000 {
                        label = "bootenv";
                        reg = <0x00500000 0x00020000>;
                };
                partition@0x00520000 {
                        label = "kernel";
                        reg = <0x00520000 0x00a80000>;
                };
                partition@0x00fa0000 {
                        label = "spare";
                        reg = <0x00fa0000 0x00000000>;
                };
        };
};

**4.2.10设置开发板启动模式**

在 uboot 下配置环境变量。复制下面的内容到 uboot 下。首次进入 uboot 需要进行环境变量设置，输入以下设置指令。

[C#] 纯文本查看 复制代码

setenv kernel_image zImage
setenv devicetree_image system.dtb
setenv sdboot 'if mmcinfo; then run uenvboot; echo Copying Linux from SD to RAM... && fatload mmc 0 ${kernel_load_address} ${kernel_image} && fatload mmc 0 ${devicetree_load_address} ${devicetree_image} && bootz ${kernel_load_address} - ${devicetree_load_address}; fi'
saveenv
run sdboot

**10.1.4搭建PWM系统工程**
由于PWM系统工程带有PL端，因此需要在uboot下配置下载比特流文件，否则系统无法正常运行。因此这里需要在uboot倒计时的时候，按下任意按键打断计数，然后复制下面的指令内容到 uboot 下，再按下回车键，即可启动linux系统。

[C#] 纯文本查看 复制代码

setenv bitstream_load_address 0x100000
setenv bitstream_image system.bit
setenv bitstream_size 0x300000
setenv kernel_image zImage
setenv devicetree_image system.dtb
setenv sdboot 'if mmcinfo; then run uenvboot; echo Copying Linux from SD to RAM... && fatload mmc 0 ${bitstream_load_address} ${bitstream_image} && fpga loadb 0 ${bitstream_load_address} ${bitstream_size} && fatload mmc 0 ${kernel_load_address} ${kernel_image} && fatload mmc 0 ${devicetree_load_address} ${devicetree_image} && bootz ${kernel_load_address} - ${devicetree_load_address}; fi'
saveenv
run sdboot