*************1、给板子添加新的驱动****************
一、 驱动程序编译进内核的步骤
在 linux 内核中增加程序需要完成以下三项工作：
1. 将编写的源代码复制到 Linux 内核源代码的相应目录；
2. 在目录的 Kconfig 文件中增加新源代码对应项目的编译配置选项；
3. 在目录的 Makefile 文件中增加对新源代码的编译条目。
bq27501驱动编译到内核中
***********************2、在内核中make时出现的错误**************
build linux kernel的错误
cc1: error: unrecognized command line option "-mlittle-endian"
cc1: error: unrecognized command line option "-mapcs"
cc1: error: unrecognized command line option "-mno-sched-prolog"
cc1: error: unrecognized command line option "-mabi=aapcs-linux"
cc1: error: unrecognized command line option "-mno-thumb-interwork"
arch/arm/kernel/asm-offsets.c:1: error: bad value (armv5t) for -march= switch
arch/arm/kernel/asm-offsets.c:1: error: bad value (strongarm) for -mtune= switch
cc1: error: unrecognized command line option "-mapcs"
cc1: error: unrecognized command line option "-mno-sched-prolog"
cc1: error: unrecognized command line option "-mabi=aapcs-linux"
cc1: error: unrecognized command line option "-mno-thumb-interwork"
arch/arm/kernel/asm-offsets.c:1: error: bad value (armv5t) for -march= switch
arch/arm/kernel/asm-offsets.c:1: error: bad value (strongarm) for -mtune= switch
原因是：CROSS_COMPILE没有设置正确
使用命令:
make ARCH=arm CROSS_COMPILE=arm-linux-
或修改makefile:
#ARCH ?= $(SUBARCH)
ARCH = arm
#CROSS_COMPILE ?=
CROSS_COMPILE = arm-linux-
修改Makefile
cd linux-2.6.35.7
vi Makefile
191 ARCH ?= arm
192 CROSS_COMPILE ?= arm-linux-