设备树学习之环境搭建

清疚 2021-12-21 07:53 200阅读 0赞

*  设备树学习之环境搭建
    
     *  配置编译器
     *  编译
     *  体验设备树

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title: 设备树学习之环境搭建  
date: 2019/4/25 19:10:47  
toc: true  
\---

# 设备树学习之环境搭建 #

## 配置编译器 ##

<table> 
 <thead> 
  <tr> 
   <th>u-boot 1.1.6</th> 
   <th>gcc-linaro-4.9.4</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>linux4.19</td> 
   <td>gcc-linaro-4.9.4</td> 
  </tr> 
  <tr> 
   <td>APP/root filesystem</td> 
   <td>arm-linux-gcc-4.3.2</td> 
  </tr> 
 </tbody> 
</table>

查看原来的环境变量

$ echo $PATH
    /home/book/bin:/home/book/.local/bin:/opt/slickedit-pro2017/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/usr/local/arm/4.3.2/bin/:/snap/bin
    book@100ask:~/stu/post/tools/gcc$

解压这个`gcc4.9`到我们指定的目录,这里为

/home/book/stu/post/tools/gcc/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabi/

所以方便以后复制

**编译内核与uboot使用的gcc4.9**

export PATH=/home/book/bin:/home/book/.local/bin:/opt/slickedit-pro2017/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/home/book/stu/post/tools/gcc/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabi/bin/:/snap/bin

> arm-linux-gnueabi-gcc -v 可以看到新的了

**编译app/root使用老的gcc4.3**

export PATH= /home/book/bin:/home/book/.local/bin:/opt/slickedit-pro2017/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/usr/local/arm/4.3.2/bin/:/snap/bin

## 编译 ##

tar xjf u-boot-1.1.6.tar.bz2 
    cd u-boot-1.1.6 
    patch -p1 < ../u-boot-1.1.6_device_tree_for_jz2440.patch 
    make 100ask24x0_config 
    make 
    
    
    cd linux-4.19-rc3
    patch -p1 < ../linux-4.19-rc3_device_tree_for_jz2440.patch
    
    cp config_ok .config
    make uImage
    make dtbs // 编译, 可以得到arch/arm/boot/dts/jz2440.dtb
    
    make dtbs
      CALL    scripts/checksyscalls.sh
    <stdin>:1332:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp]
      DTC     arch/arm/boot/dts/jz2440.dtb
      DTC     arch/arm/boot/dts/s3c2416-smdk2416.dtb

> 如果提示"mkimage not found", 先编译u-boot, 把tools/mkimage复制到/bin目录
> 
> 如果提示"openssl/bio.h: No such file or directory" ,则需要
> 
> sudo apt-get update  
> sudo apt-get install libssl-dev

## 体验设备树 ##

启动后在`/sys/devices/platform`查看到设备`50005.led`

转载于:https://www.cnblogs.com/zongzi10010/p/10793069.html