【系统移植】Android系统移植

$ . . /build /envsetup.sh 　 // 每打开一个终端,就需要执行一次
$ choosecombo   // 选择产品
Build for the simulator or the device ?   // 目标文件时运行在模拟上还是真实的开发板
      1. Device
      2. Simulator
Which would you like ? [ 1] 1

Build type choices are :   // 编译目标文件的类型
      1. release
      2. debug
Which would you like ? [ 1] 1

Which product would you like ? [generic] fs100   // 产品的名字叫fs100

Variant choices are : // 目标文件给谁用, 权限的管理
      1. user   // 用户, 产品
      2. userdebug // 用户调试, 
      3. eng // 工程师
Which would you like ? [eng] 3
== == == == == == == == == == == == == == == == == == == == == ==
PLATFORM_VERSION_CODENAME =REL
PLATFORM_VERSION = 2. 1 -update1
TARGET_PRODUCT =fs100
TARGET_BUILD_VARIANT =eng
TARGET_SIMULATOR = false
TARGET_BUILD_TYPE =release
TARGET_ARCH =arm
HOST_ARCH =x86
HOST_OS =linux
HOST_BUILD_TYPE =release
BUILD_ID =ERE27
== == == == == == == == == == == == == == == == == == == == == ==

编译　make -j2

编译完成之后

    eclair_2.1_farsight ===> rootfs

制作根文件目录:

out /target /product /fs10 /root
out /target /product /fs10 /system
mkdir myrootfs
cp -raf out /target /product /fs100 /root /* myrootfs/
cp -raf out/target/product/fs100/system   myrootfs

 

===> 制作后的rootfs里面有什么内容:

data    // apk安装目录      
default.prop  
system
    |
   app // 系统自带的apk
   bin  
   etc
   lib  
   usr  
   xbin
   build.prop    // 编译的属性信息: 编译时间,作者,平台 
   fonts    // 字体库
   framework   // android framework运行核心代码的二进制文件
 
init    // 第一个用户进程 
init.fs100.rc    
init.rc    // 启动脚本, 规定了init进程会去启动哪些其他的进程, 类似etc/inittab
init.goldfish.rc 
sbin 
dev
proc     
sys

运行

1, 烧录的方式:

set bootcmd nand read 0x20008000  0x900000 0x300000 \; go 0x20008000
set bootargs console =ttySAC0, 115200  init = /init root = /dev /mtdblock3   rootfstype =yaffs2 ip = 192. 168. 7. 6 ethaddr =00 : 23 : 24 : 56 : 7e : 8e
或者 :
 set bootargs console =ttySAC0, 115200  init = /init root = 1f03   rootfstype =yaffs2
或者 :
 set bootargs console =ttySAC0, 115200  init = /init root = 31 : 03   rootfstype =yaffs2

因为烧录的jffs, yaffs扫描的时候出问题, 文件系统的分区部分擦擦出
yaffs tragedy : no more erased blocks
! ! ! ! ! ! ! ! ! Allocator out ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
yaffs tragedy : no more erased blocks
! ! ! ! ! ! ! ! ! Allocator out ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
yaffs tragedy : no more erased blocks
! ! ! ! ! ! ! ! ! Allocator out ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
yaffs tragedy : no more erased blocks
! ! ! ! ! ! ! ! ! Allocator out ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
yaffs tragedy : no more erased blocks

解决:nand erase 0x9800000 0x6800000

调试

log系统
    / # ls /dev/log/*
    /dev/log/events(数据事件)  /dev/log/main(大部分的调试信息)    /dev/log/radio(针对无线通信)

logcat   == > main缓冲区的调试信息
logcat -b main
logcat -b radio
logcat -b events

I /ActivityManager( 1900) : Start proc com.android.inputmethod.latin for service com.android.inputmethod.latin /.LatinIME : pid = 1945 uid = 10002 gids ={ 3003, 1015}
调试级别 /标签tag(pid) : 调试内容
调试级别 : 
D   debug
I   info
W   warning
E   error
F   fatal
标签tag : 区分调试信息是从哪个代码中打印出来

过滤: 
logcat -s "ActivityManager"
//清空缓冲
logcat -c

 

android中如何用c写一个可执行代码--->编译出来-->运行

Android.mk==> 改编后的Makefile

目标文件名 : 依赖文件名
 编译规则
目标文件的路径
依赖文件的路径
写 : 抄模板 :hardware /ril /rild /Android.mk
#获取源码目录
LOCAL_PATH : = $(call my -dir)
include $(CLEAR_VARS)
#表示依赖文件
LOCAL_SRC_FILES : = hello.c
#表示目标文件
LOCAL_MODULE : = hello_arm_elf
#表示编译方法
include $(BUILD_EXECUTABLE)

===> 编译:

mmm mytest/c_test/
== == == == == == == == == == == == == == == == == == == == == ==
PLATFORM_VERSION_CODENAME =REL
PLATFORM_VERSION = 2. 1 -update1
TARGET_PRODUCT =fs100
TARGET_BUILD_VARIANT =eng
TARGET_SIMULATOR = false
TARGET_BUILD_TYPE =release
TARGET_ARCH =arm
HOST_ARCH =x86
HOST_OS =linux
HOST_BUILD_TYPE =release
BUILD_ID =ERE27
== == == == == == == == == == == == == == == == == == == == == ==
make :进入目录 '/home/ldswfun/src_s5pc/eclair_2.1_farsight'
target thumb C : hello_arm_elf < = mytest /c_test /hello.c
target Executable : hello_arm_elf (out /target /product /fs100 /obj /EXECUTABLES /hello_arm_elf_intermediates /LINKED /hello_arm_elf)
target Non -prelinked : hello_arm_elf (out /target /product /fs100 /symbols /system /bin /hello_arm_elf)
target Strip : hello_arm_elf (out /target /product /fs100 /obj /EXECUTABLES /hello_arm_elf_intermediates /hello_arm_elf)
Install : out /target /product /fs100 /system /bin /hello_arm_elf
make :离开目录“ /home /ldswfun /src_s5pc /eclair_2. 1_farsight”

===> 运行:

    cp -raf  out/target/product/fs100/system/bin/hello_arm_elf   /opt/myrootfs/

 

  @成鹏致远

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