IMX6ULL - 移植linux-imx_5.4.70_2.3.0

一、说明

主机系统：Ubuntu 20.04.3 LTS

开发板：TOPEET-IMX6ULL

Linux版本：linux-imx_5.4.70_2.3.0

交叉编译器：gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf

有了前面IMX6ULL-移植uboot-imx_v2020.04_5.4.70_2.3.0的基础再进行Linux移植就会方便很多。因为Linux的移植更多的是对设备树的修改，而在Uboot移植时已经修改过设备树，所以接下来会省不少事。

二、环境搭建

2.1、Linux源码

获取NXP维护的Linux内核源码：

git clone https://source.codeaurora.org/external/imx/linux-imx

使用命令git tag -a查看版本然后git checkout -b 切换到目标版本：

git checkout -b rel_imx_5.4.70_2.3.0

接下来就基于版本源码进行linux内核移植

2.2、交叉编译器

参考IMX6ULL-移植uboot-imx_v2020.04_5.4.70_2.3.0的2.2小节

三、编译源码

linux源码根目录下创建编译脚本make.sh内容如下：

#!/bin/bash

# 若之前已经导入到环境变量则不需要

export PATH=$PATH:/usr/local/arm/gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf/bin

# 若已经在顶层Makefile文件中指定则不需要

export ARCH=arm

# 若已经在顶层Makefile文件中指定则不需要

export CROSS_COMPILE=arm-none-linux-gnueabihf-

make distclean

# make mrproper

# For I.MX6 --> imx_v7_defconfig

# For I.MX7 --> imx_v7_defconfig

# For I.MX8 --> imx_v8_defconfig

make imx_v7_defconfig

# make menuconfig

 make -j $(nproc) all

执行编译./make.sh并等待编译完成，如果没有错误出现说明搭建环境OK。

补充说明：

make命令

/imx6ull/kernel/linux-imx_5.4.70_2.3.0$ make help

Cleaning targets:

  clean   - Remove most generated files but keep the config and

                    enough build support to build external modules

  mrproper   - Remove all generated files + config + various backup files

  distclean   - mrproper + remove editor backup and patch files

Configuration targets:

  config   - Update current config utilising a line-oriented program

  nconfig         - Update current config utilising a ncurses menu based program

  menuconfig   - Update current config utilising a menu based program

  xconfig   - Update current config utilising a Qt based front-end

  gconfig   - Update current config utilising a GTK+ based front-end

  oldconfig   - Update current config utilising a provided .config as base

  localmodconfig  - Update current config disabling modules not loaded

  localyesconfig  - Update current config converting local mods to core

  defconfig   - New config with default from ARCH supplied defconfig

  savedefconfig   - Save current config as ./defconfig (minimal config)

  allnoconfig   - New config where all options are answered with no

  allyesconfig   - New config where all options are accepted with yes

  allmodconfig   - New config selecting modules when possible

  alldefconfig    - New config with all symbols set to default

  randconfig   - New config with random answer to all options

  listnewconfig   - List new options

  olddefconfig   - Same as oldconfig but sets new symbols to their

                    default value without prompting

  kvmconfig   - Enable additional options for kvm guest kernel support

  xenconfig       - Enable additional options for xen dom0 and guest kernel support

  tinyconfig   - Configure the tiniest possible kernel

  testconfig   - Run Kconfig unit tests (requires python3 and pytest)

Other generic targets:

  all   - Build all targets marked with [*]

* vmlinux   - Build the bare kernel

* modules   - Build all modules

  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)

  dir/            - Build all files in dir and below

  dir/file.[ois]  - Build specified target only

  dir/file.ll     - Build the LLVM assembly file

                    (requires compiler support for LLVM assembly generation)

  dir/file.lst    - Build specified mixed source/assembly target only

                    (requires a recent binutils and recent build (System.map))

  dir/file.ko     - Build module including final link

  modules_prepare - Set up for building external modules

  tags/TAGS   - Generate tags file for editors

  cscope   - Generate cscope index

  gtags           - Generate GNU GLOBAL index

  kernelrelease   - Output the release version string (use with make -s)

  kernelversion   - Output the version stored in Makefile (use with make -s)

  image_name   - Output the image name (use with make -s)

  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH

                    (default: ./usr)

Static analysers:

  checkstack      - Generate a list of stack hogs

  namespacecheck  - Name space analysis on compiled kernel

  versioncheck    - Sanity check on version.h usage

  includecheck    - Check for duplicate included header files

  export_report   - List the usages of all exported symbols

  headerdep       - Detect inclusion cycles in headers

  coccicheck      - Check with Coccinelle

Tools:

  nsdeps          - Generate missing symbol namespace dependencies

Kernel selftest:

  kselftest       - Build and run kernel selftest (run as root)

                    Build, install, and boot kernel before

                    running kselftest on it

  kselftest-clean - Remove all generated kselftest files

  kselftest-merge - Merge all the config dependencies of kselftest to existing

                    .config.

Userspace tools targets:

  use 'make tools/help'

  or  'cd tools; make help'

Kernel packaging:

  rpm-pkg             - Build both source and binary RPM kernel packages

  binrpm-pkg          - Build only the binary kernel RPM package

  deb-pkg             - Build both source and binary deb kernel packages

  bindeb-pkg          - Build only the binary kernel deb package

  snap-pkg            - Build only the binary kernel snap package (will connect to external hosts)

  tar-pkg             - Build the kernel as an uncompressed tarball

  targz-pkg           - Build the kernel as a gzip compressed tarball

  tarbz2-pkg          - Build the kernel as a bzip2 compressed tarball

  tarxz-pkg           - Build the kernel as a xz compressed tarball

  perf-tar-src-pkg    - Build perf-5.4.70.tar source tarball

  perf-targz-src-pkg  - Build perf-5.4.70.tar.gz source tarball

  perf-tarbz2-src-pkg - Build perf-5.4.70.tar.bz2 source tarball

  perf-tarxz-src-pkg  - Build perf-5.4.70.tar.xz source tarball

Documentation targets:

 Linux kernel internal documentation in different formats from ReST:

  htmldocs        - HTML

  latexdocs       - LaTeX

  pdfdocs         - PDF

  epubdocs        - EPUB

  xmldocs         - XML

  linkcheckdocs   - check for broken external links (will connect to external hosts)

  refcheckdocs    - check for references to non-existing files under Documentation

  cleandocs       - clean all generated files

  make SPHINXDIRS='s1 s2' [target] Generate only docs of folder s1, s2

  valid values for SPHINXDIRS are: 

  make SPHINX_CONF={conf-file} [target] use *additional* sphinx-build

  configuration. This is e.g. useful to build with nit-picking config.

  Default location for the generated documents is Documentation/output

Architecture specific targets (x86):

* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)

  install      - Install kernel using

                  (your) ~/bin/installkernel or

                  (distribution) /sbin/installkernel or

                  install to $(INSTALL_PATH) and run lilo

  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)

  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)

  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)

  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)

                  bzdisk/fdimage*/isoimage also accept:

                  FDARGS='...'  arguments for the booted kernel

                  FDINITRD=file initrd for the booted kernel

  i386_defconfig           - Build for i386

  x86_64_defconfig         - Build for x86_64

  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build

  make V=2   [targets] 2 => give reason for rebuild of target

  make O=dir [targets] Locate all output files in 'dir', including .config

  make C=1   [targets] Check re-compiled c source with $CHECK (sparse by default)

  make C=2   [targets] Force check of all c source with $CHECK

  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections

  make W=n   [targets] Enable extra build checks, n=1,2,3 where