Android ROM开发(12) 编译HTC G8 内核

bluedrum

Andrew Huang <bluedrum@163.com>  转载请注明作者及出处

一.准备工作

 

  有一个 http://htcevohacks.com/htc-evo-hacks/how-to-build-your-own-htc-evo-4g-android-kernel/ 可以参考，这是G4的.

  内核下载 

  现在HTC将开发网站由 http://developer.htc.com 从定向到http://htcdev.com/ 了。

  内核下载在 http://htcdev.com/devcenter/downloads

  对于HTC G8可以选择HTC Wildfire – Froyo MR – 2.6.32 kernel source code ,最终下载的文件是

  http://dl4.htc.com/RomCode/Source_and_Binaries/buzz-MR-2.6.32-g8f75634.tar.gz 

  关于编译器，从原理上讲一般的eabi的ARM 编译器应该都可以。我先用我的arm-linux-gcc 4.2.2 先试一下。

 

 解压内核

   tar xvf buzz-MR-2.6.32-g8f75634.tar.gz

   mv buzz-MR-2.6.32-g8f75634 g8-buzz-2.6.32

 取配置文件

 这个内核是没有配置好的内核文件备份，因此必须要从一台激活的HTC G8手机取得配置文件。

  

  直接用如下命令 

     adb pull /proc/config.gz 

   取得当前内核配置，将其解压

    gunzip config.gz

    cp config g8-buzz-2.6.32/.config

二.编译内核

  修改内核编译器,即内核的Makefile

   原来是  CROSS_COMPILE  ?= arm-eabi- 将其修改成我当前的编译器

    CROSS_COMPILE   ?= arm-linux-

  

  make menuconfig 可以查看其CPU的的类型

   

 

export LANG=en_US.UTF-8

make

第一次编译报错

1. arch/arm/kernel/unwind.c:34:2: error: #warning Your compiler is too buggy; it is known to not compile ARM unwind support.
2. arch/arm/kernel/unwind.c:35:2: error: #warning Change compiler or disable ARM _UNWIND option.

因此准备换一个编译版本较高的编译器,换成4.5.1

有编译错误

1. cc1: warnings being treated as errors
2. init/main.c: In function 'do_one_initcall':
3. init/main.c:706:10: error: 'calltime.tv64' may be used uninitialized in this function

 

这是未初始化三个变量

         ktime_t calltime, delta, rettime;

参考这里说明

 http://www.unixresources.net/linux/clf/linuxK/archive/00/00/65/62/656211.html

 将代码更新成

  

1. /* ktime_t calltime, delta, rettime;*/
   
2.     707 DEFINE_KTIME(calltime);
   
3.     708 DEFINE_KTIME(delta);
   
4.     709 DEFINE_KTIME(rettime);

修正后又碰如下错误

1. arch/arm/mm/alignment.c:716:21: error: 'offset.un' may be used uninitialized in this function

  union offset_union offset; 

将其修改为

  716         union offset_union offset = { .un = 0};   

结果又碰到

1. kernel/async.c: In function 'async_thread':
2. kernel/async.c:126:10: error: 'calltime.tv64' may be used uninitialized in this function
3. kernel/async.c:126:10: note: 'calltime.tv64' was declared here
4. kernel/async.c: In function 'async_synchronize_cookie_domain':
5. kernel/async.c:282:10: error: 'starttime.tv64' may be used uninitialized in this function

原因同前,一样修改

又碰到leds

1. drivers/leds/leds-microp.c: In function 'microp_led_jogball_brightness_set':
2. drivers/leds/leds-microp.c:117:2: error: case value '1' not in enumerated type 'enum led_brightness'
3. drivers/leds/leds-microp.c:121:2: error: case value '3' not in enumerated type 'enum led_brightness'
4. drivers/leds/leds-microp.c:125:2: error: case value '7' not in enumerated type 'enum led_brightness'
5. drivers/leds/leds-microp.c: In function 'microp_led_wimax_brightness_set':
6. drivers/leds/leds-microp.c:163:2: error: case value '1' not in enumerated type 'enum led_brightness'
7. drivers/leds/leds-microp.c:164:2: error: case value '2' not in enumerated type 'enum led_brightness'
8. drivers/leds/leds-microp.c:165:2: error: case value '3' not in enumerated type 'enum led_brightness'
9. drivers/leds/leds-microp.c:166:2: error: case value '4' not in enumerated type 'enum led_brightness'
10. drivers/leds/leds-microp.c:167:2: error: case value '5' not in enumerated type 'enum led_brightness'
11. drivers/leds/leds-microp.c:168:2: error: case value '129' not in enumerated type 'enum led_brightness'
12. drivers/leds/leds-microp.c:169:2: error: case value '130' not in enumerated type 'enum led_brightness'
13. drivers/leds/leds-microp.c:170:2: error: case value '131' not in enumerated type 'enum led_brightness'

查看include/linux/leds.h 只有如下定义

1. enum led_brightness {
   
2.     LED_OFF        = 0,
   
3.     LED_HALF    = 127,
   
4.     LED_FULL    = 255,
   
5. };

增加定义

又碰到

1. cc1: warnings being treated as errors
2. drivers/md/dm.c: In function 'split_bvec':
3. drivers/md/dm.c:1032:3: error: statement with no effect
4. drivers/md/dm.c: In function 'clone_bio':
5. drivers/md/dm.c:1060:3: error: statement with no effect

错误实在太多了，没办法只能将-Werror 选项去掉，

即将.config中的 注释掉

   CONFIG_FORCE_WARNING_AS_ERROR=y

1. LD vmlinux
2. SYSMAP System.map
3. SYSMAP .tmp_System.map
4. OBJCOPY arch/arm/boot/Image
5. Kernel: arch/arm/boot/Image is ready
6. AS arch/arm/boot/compressed/head.o
7. GZIP arch/arm/boot/compressed/piggy.gz
8. AS arch/arm/boot/compressed/piggy.o
9. CC arch/arm/boot/compressed/misc.o
10. LD arch/arm/boot/compressed/vmlinux
11. OBJCOPY arch/arm/boot/zImage
12. Kernel: arch/arm/boot/zImage is ready
13. Building modules, stage 2.
14. MODPOST 1 modules
15. CC drivers/net/wireless/bcm4329_204/bcm4329.mod.o
16. LD [M] drivers/net/wireless/bcm4329_204/bcm4329.ko
17. [root@gz g8-buzz-2.6.32]# vi .config
18. [root@gz g8-buzz-2.6.32]# vim Makefile
19. [root@gz g8-buzz-2.6.32]# vim .config
20. [root@gz g8-buzz-2.6.32]# vim Makefile