Android ROM开发(12) 编译HTC G8 内核

Andrew Huang  转载请注明作者及出处

一.准备工作

 

  有一个  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

  

  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

arch/arm/kernel/unwind.c:34:2: error: #warning Your compiler is too buggy; it                            is known to not compile ARM unwind support.
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

cc1: warnings being treated as errors
init/main.c: In function 'do_one_initcall':
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

 

 将代码更新成

  

/*      ktime_t calltime, delta, rettime;*/
    707        DEFINE_KTIME(calltime);
    708        DEFINE_KTIME(delta);
    709        DEFINE_KTIME(rettime);

修正后又碰如下错误

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

kernel/async.c: In function 'async_thread':
kernel/async.c:126:10: error: 'calltime.tv64' may be used uninitialized in this function
kernel/async.c:126:10: note: 'calltime.tv64' was declared here
kernel/async.c: In function 'async_synchronize_cookie_domain':
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

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

enum led_brightness {
    LED_OFF        = 0,
    LED_HALF    = 127,
    LED_FULL    = 255,
};

增加定义

又碰到

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

LD      vmlinux
SYSMAP  System.map
SYSMAP  .tmp_System.map
OBJCOPY arch/arm/boot/Image
Kernel: arch/arm/boot/Image is ready
AS      arch/arm/boot/compressed/head.o
GZIP    arch/arm/boot/compressed/piggy.gz
AS      arch/arm/boot/compressed/piggy.o
CC      arch/arm/boot/compressed/misc.o
LD      arch/arm/boot/compressed/vmlinux
OBJCOPY arch/arm/boot/zImage
Kernel: arch/arm/boot/zImage is ready
Building modules, stage 2.
MODPOST 1 modules
CC      drivers/net/wireless/bcm4329_204/bcm4329.mod.o
LD [M]  drivers/net/wireless/bcm4329_204/bcm4329.ko
[root@gz g8-buzz-2.6.32]# vi .config
[root@gz g8-buzz-2.6.32]# vim Makefile
[root@gz g8-buzz-2.6.32]# vim .config
[root@gz g8-buzz-2.6.32]# vim Makefile