【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”