把autoconfig.mk和/include/configs/

$(obj)include/autoconf.mk.dep: $(obj)include/config.h include/common.h   //这个地方指定了autoconfig.mk的由来

@$(XECHO) Generating $@ ; \

set -e ; \

: Generate the dependancies ; \

$(CC) -x c -DDO_DEPS_ONLY -M $(HOSTCFLAGS) $(CPPFLAGS) \

-MQ $(obj)include/autoconf.mk include/common.h > $@

$(obj)include/autoconf.mk: $(obj)include/config.h  //主要由config.h中的头文件包含而来 

@$(XECHO) Generating $@ ; \

set -e ; \

: Extract the config macros ; \

$(CPP) $(CFLAGS) -DDO_DEPS_ONLY -dM include/common.h | \

sed -n -f tools/scripts/define2mk.sed > $@.tmp && \

mv $@.tmp $@

在我的/include/config.h文件的内容是：

1 /* Automatically generated - do not edit */

2 #include <configs/mx6q_sabresd_android_2G.h>

3 #include <asm/config.h>

顺藤摸瓜，进入mx6q_sabresd_android_1G.h文件，内容如下

22 #ifndef MX6Q_SABRESD_ANDROID_H

23 #define MX6Q_SABRESD_ANDROID_H

24

25 #define CONFIG_FASTBOOT_PRODUCT_NAME_STR "Cynoware i.mx6dq Device"

26 #include "mx6q_sabresd.h"  //最重要的文件

27 #include "mx6_sabresd_android.h"

28

29 #endif

再进入mx6q_sabresd.h文件如下为选取的部分CONFIG_定义

#define CONFIG_CMD_PING

#define CONFIG_CMD_DHCP

#define CONFIG_CMD_MII

#define CONFIG_CMD_NET

#define CONFIG_NET_RETRY_COUNT 100

#define CONFIG_NET_MULTI 1

#define CONFIG_BOOTP_SUBNETMASK

#define CONFIG_BOOTP_GATEWAY

#define CONFIG_BOOTP_DNS

#define CONFIG_CMD_SPI

#define CONFIG_CMD_I2C

#define CONFIG_CMD_IMXOTP

/* Enable below configure when supporting nand */

#define CONFIG_CMD_SF

#define CONFIG_CMD_MMC

#define CONFIG_CMD_ENV

#define CONFIG_CMD_REGUL

#define CONFIG_CMD_CLOCK

#define CONFIG_REF_CLK_FREQ CONFIG_MX6_HCLK_FREQ

/* #define CONFIG_CMD_SATA */

#undef CONFIG_CMD_IMLS

#define CONFIG_CMD_IMX_DOWNLOAD_MODE

#define CONFIG_BOOTDELAY 3

#define CONFIG_PRIME "FEC0"

#define CONFIG_LOADADDR 0x10800000 /* loadaddr env var */

#define CONFIG_RD_LOADADDR (0x1300000)

#define CONFIG_EXTRA_ENV_SETTINGS \

"netdev=eth0\0" \

"ethprime=FEC0\0" \

"uboot=u-boot.bin\0" \

"kernel=uImage\0" \

"nfsroot=/opt/eldk/arm\0" \

"bootargs_base=setenv bootargs console=ttymxc0,115200\0"\

"bootargs_nfs=setenv bootargs ${bootargs} root=/dev/nfs "\

"ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp\0"\

"bootcmd_net=run bootargs_base bootargs_nfs; " \

"tftpboot ${loadaddr} ${kernel}; bootm\0" \

"bootargs_mmc=setenv bootargs ${bootargs} ip=dhcp " \

"root=/dev/mmcblk0p1 rootwait\0" \

"bootcmd_mmc=run bootargs_base bootargs_mmc; " \

"mmc dev 3; " \

"mmc read ${loadaddr} 0x800 0x2000; bootm\0" \

"bootcmd=run bootcmd_net\0" \

再进入mx6_sabresd_android.h文件分析

#ifndef MX6Q_SABRESD_ANDROID_INC_H

#define MX6Q_SABRESD_ANDROID_INC_H

#define CONFIG_USB_DEVICE

#define CONFIG_IMX_UDC 1

#define CONFIG_FASTBOOT 1

#define CONFIG_FASTBOOT_STORAGE_EMMC_SATA

#define CONFIG_FASTBOOT_VENDOR_ID 0x18d1

#define CONFIG_FASTBOOT_PRODUCT_ID 0x0d02

#define CONFIG_FASTBOOT_BCD_DEVICE 0x311

#define CONFIG_FASTBOOT_MANUFACTURER_STR "Freescale"

#define CONFIG_FASTBOOT_INTERFACE_STR "Android fastboot"

#define CONFIG_FASTBOOT_CONFIGURATION_STR "Android fastboot"

#define CONFIG_FASTBOOT_SERIAL_NUM "12345"

#define CONFIG_FASTBOOT_SATA_NO 0

/* For system.img growing up more than 256MB, more buffer needs

* to receive the system.img*/

#define CONFIG_FASTBOOT_TRANSFER_BUF 0x2c000000

#define CONFIG_FASTBOOT_TRANSFER_BUF_SIZE 0x14000000 /* 320M byte */

#define CONFIG_CMD_BOOTI

#define CONFIG_ANDROID_RECOVERY

/* which mmc bus is your main storage ? */

#define CONFIG_ANDROID_MAIN_MMC_BUS 3

#define CONFIG_ANDROID_BOOT_PARTITION_MMC 1

#define CONFIG_ANDROID_SYSTEM_PARTITION_MMC 5

#define CONFIG_ANDROID_RECOVERY_PARTITION_MMC 2

#define CONFIG_ANDROID_CACHE_PARTITION_MMC 6

#define CONFIG_ANDROID_RECOVERY_BOOTARGS_MMC NULL

#define CONFIG_ANDROID_RECOVERY_BOOTCMD_MMC \

"booti mmc3 recovery"

#define CONFIG_ANDROID_RECOVERY_BOOTCMD_SD \

"booti mmc2 recovery"

#define CONFIG_ANDROID_RECOVERY_CMD_FILE "/recovery/command"

#define CONFIG_INITRD_TAG

#undef CONFIG_LOADADDR

#undef CONFIG_RD_LOADADDR

#undef CONFIG_EXTRA_ENV_SETTINGS

#define CONFIG_LOADADDR 0x10800000 /* loadaddr env var */

#define CONFIG_RD_LOADADDR 0x11000000

#define CONFIG_INITRD_TAG

#define CONFIG_EXTRA_ENV_SETTINGS \

"netdev=eth0\0" \

"ethprime=FEC0\0" \

"fastboot_dev=mmc3\0" \

"bootcmd=run hw_${hw_name}; run hw_${hw_name}_${hw_version}; run set_bootargs; booti mmc3\0"\

"bootcmd_android_recovery=run hw_${hw_name}; run hw_${hw_name}_${hw_version}; run set_bootargs; booti mmc3 recovery\0"\

"splashimage=0x30000000\0" \

"splashpos=m,m\0" \

"lvds_num=0\0" \

"screen0=setenv video video=mxcfb0:dev=ldb,LDB-XGA,if=RGB24,bpp=32 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 video=mxcfb2:off fbmem=10M,28M vmalloc=512M ldb=dul1\0" \

"screen1=setenv video video=mxcfb0:dev=ldb,1024x600M@60,if=RGB666,bpp=32 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 video=mxcfb2:off fbmem=10M,28M vmalloc=512M ldb=dul1\0" \

"screen2=setenv video video=mxcfb0:dev=ldb,1366x768M@60,if=RGB666,bpp=32 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 video=mxcfb2:off fbmem=14M,28M vmalloc=512M ldb=dul1\0" \

"screen3=setenv video video=mxcfb0:dev=ldb,LDB-XGA,if=RGB24,bpp=32 video=mxcfb1:off video=mxcfb2:off fbmem=10M vmalloc=400M ldb=sin0\0" \

"screen4=setenv video video=mxcfb0:dev=ldb,1440x900M@60,if=RGB24,bpp=32 video=mxcfb1:off video=mxcfb2:off fbmem=28M vmalloc=512M ldb=spl0\0" \

"screen5=setenv video video=mxcfb0:dev=ldb,LDB-XGA,if=RGB24,bpp=32 video=mxcfb1:dev=hdmi,1024x768M@60,if=RGB24,bpp=32 video=mxcfb2:off fbmem=10M,28M vmalloc=512M ldb=dul1\0" \

"screen6=setenv video video=mxcfb0:dev=ldb,LDB-XGA,if=RGB666,bpp=32 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 video=mxcfb2:off fbmem=10M,28M vmalloc=512M ldb=dul1\0" \

"set_bootargs=setenv bootargs console=ttymxc0,115200 androidboot.console=ttymxc0 androidboot.hardware=freescale init=/init ${video} enable_wait_mode=off calibration hw_name=${hw_name} hw_version=${hw_version} fec_mac=${fec_mac}\0"\

"hw_general=setenv lvds_num; run screen0\0" \

"hw_P140=setenv lvds_num 0; run screen2\0" \

"hw_S10=setenv lvds_num 0; run screen1\0" \

"hw_P10=run hw_S10\0" \

"hw_C6=set lvds_num; run screen5\0" \

"hw_name=general\0" \

"hw_version=0\0"

#endif

//xh: remove fb0base=... according to https://freescale.hosted.jivesoftware.com/thread/325541

/

CONFIG_CMD_FAT=y

CONFIG_HARD_I2C=y

CONFIG_IMX_OTP=y

CONFIG_CMD_ITEST=y

CONFIG_ETH_PRIME=y

CONFIG_CMD_BDI=y

CONFIG_MX6Q=y

CONFIG_SYS_GBL_DATA_SIZE=128

CONFIG_SYS_LOAD_ADDR="CONFIG_LOADADDR"

CONFIG_DISPLAY_BOARDINFO=y

CONFIG_STACKSIZE="(128 * 1024)"

CONFIG_SYS_HELP_CMD_WIDTH=8

CONFIG_NR_DRAM_BANKS=y

CONFIG_CMD_CONSOLE=y

CONFIG_FEC0_PINMUX="-1"

CONFIG_GET_FEC_MAC_ADDR_FROM_IIM=y

CONFIG_MMC=y

CONFIG_REVISION_TAG=y

CONFIG_ARM=y

CONFIG_FASTBOOT_INTERFACE_STR="Android fastboot"

CONFIG_MX6Q_SABRESD=y

CONFIG_ENV_OFFSET="(768 * 1024)"

CONFIG_MXC=y

CONFIG_ENV_OVERWRITE=y

CONFIG_CMD_NET=y

CONFIG_CMD_NFS=y

CONFIG_ENV_SIZE="CONFIG_ENV_SECT_SIZE"

CONFIG_CMD_PING=y

CONFIG_SYS_MALLOC_LEN="(2 * 1024 * 1024)"

CONFIG_SYS_NO_FLASH=y

CONFIG_INITRD_TAG=y

CONFIG_SYS_MMC_ENV_DEV=2

CONFIG_FASTBOOT_STORAGE_EMMC_SATA=y

CONFIG_CMD_CLOCK=y

CONFIG_CMD_FLASH=y

CONFIG_CMD_SAVEENV=y

CONFIG_IMX_PWM=y

CONFIG_FSL_ENV_IN_MMC=y

CONFIG_CMD_IMXOTP=y

CONFIG_DYNAMIC_MMC_DEVNO=y

CONFIG_IMX_ECSPI=y

CONFIG_SYS_BAUDRATE_TABLE="{9600, 19200, 38400, 57600, 115200}"

CONFIG_FASTBOOT_SERIAL_NUM=12345

CONFIG_FEC0_MIIBASE="-1"

CONFIG_FLASH_HEADER=y

CONFIG_MXC_GPIO=y

CONFIG_CMD_SETGETDCR=y

CONFIG_CMD_EXT2=y

CONFIG_FEC0_IOBASE="ENET_BASE_ADDR"

CONFIG_FASTBOOT_PRODUCT_NAME_STR="Cynoware i.mx6dq Device"

CONFIG_SERIAL_TAG=y

CONFIG_ANDROID_SYSTEM_PARTITION_MMC=5

CONFIG_FASTBOOT_MANUFACTURER_STR="Freescale"

CONFIG_NET_MULTI=y

CONFIG_DOS_PARTITION=y

CONFIG_FASTBOOT_TRANSFER_BUF="0x2c000000"

CONFIG_RD_LOADADDR="0x11000000"

CONFIG_CMD_FPGA=y

CONFIG_SYS_FSL_ESDHC_ADDR=0

CONFIG_CMD_REGUL=y

CONFIG_L2_OFF=y

CONFIG_SYS_I2C_SLAVE="0x8"

CONFIG_ANDROID_RECOVERY=y

CONFIG_CMD_ECHO=y

CONFIG_GENERIC_MMC=y

CONFIG_PRIME="FEC0"

CONFIG_EXTRA_ENV_SETTINGS="netdev=eth0\0ethprime=FEC0\0fastboot_dev=mmc3\0bootcmd=run hw_${hw_name}; run hw_${hw_name}_${hw_version}; run set_bootargs; booti mmc3\0bootcmd_android_recovery=run hw_${hw_name}; run hw_${hw_name}_${hw_version}; run set_bootargs; booti mmc3 recovery\0splashimage=0x30000000\0splashpos=m,m\0lvds_num=0\0screen0=setenv video video=mxcfb0:dev=ldb,LDB-XGA,if=RGB24,bpp=32 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 video=mxcfb2:off fbmem=10M,28M vmalloc=512M ldb=dul1\0screen1=setenv video video=mxcfb0:dev=ldb,1024x600M@60,if=RGB666,bpp=32 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 video=mxcfb2:off fbmem=10M,28M vmalloc=512M ldb=dul1\0screen2=setenv video video=mxcfb0:dev=ldb,1366x768M@60,if=RGB666,bpp=32 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 video=mxcfb2:off fbmem=14M,28M vmalloc=512M ldb=dul1\0screen3=setenv video video=mxcfb0:dev=ldb,LDB-XGA,if=RGB24,bpp=32 video=mxcfb1:off video=mxcfb2:off fbmem=10M vmalloc=400M ldb=sin0\0screen4=setenv video video=mxcfb0:dev=ldb,1440x900M@60,if=RGB24,bpp=32 video=mxcfb1:off video=mxcfb2:off fbmem=28M vmalloc=512M ldb=spl0\0screen5=setenv video video=mxcfb0:dev=ldb,LDB-XGA,if=RGB24,bpp=32 video=mxcfb1:dev=hdmi,1024x768M@60,if=RGB24,bpp=32 video=mxcfb2:off fbmem=10M,28M vmalloc=512M ldb=dul1\0screen6=setenv video video=mxcfb0:dev=ldb,LDB-XGA,if=RGB666,bpp=32 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 video=mxcfb2:off fbmem=10M,28M vmalloc=512M ldb=dul1\0set_bootargs=setenv bootargs console=ttymxc0,115200 androidboot.console=ttymxc0 androidboot.hardware=freescale init=/init ${video} enable_wait_mode=off calibration hw_name=${hw_name} hw_version=${hw_version} fec_mac=${fec_mac}\0hw_general=setenv lvds_num; run screen0\0hw_P140=setenv lvds_num 0; run screen2\0hw_S10=setenv lvds_num 0; run screen1\0hw_P10=run hw_S10\0hw_C6=set lvds_num; run screen5\0hw_name=general\0hw_version=0\0"

CONFIG_FB_BASE="(TEXT_BASE + 0x300000)"

CONFIG_FASTBOOT_BCD_DEVICE="0x311"

CONFIG_NETMASK="255.255.255.0"

CONFIG_FASTBOOT_TRANSFER_BUF_SIZE="0x14000000"

CONFIG_SPLASH_SCREEN_ALIGN=y

CONFIG_SYS_DEF_EEPROM_ADDR=0

CONFIG_SYS_MEMTEST_END="0x10010000"

CONFIG_CMD_I2C=y

CONFIG_ARCH_CPU_INIT=y

CONFIG_CMD_IMX_DOWNLOAD_MODE=y

CONFIG_BAUDRATE=115200

CONFIG_SYS_MEMTEST_START="0x10000000"

CONFIG_CMD_LOADB=y

CONFIG_FEC0_PHY_ADDR="0xFF"

CONFIG_CMD_LOADS=y

CONFIG_CMD_IMI=y

CONFIG_IMX_UDC=y

CONFIG_ARMV7=y

CONFIG_FASTBOOT_CONFIGURATION_STR="Android fastboot"

CONFIG_RMII=y

CONFIG_BOOTP_SUBNETMASK=y

CONFIG_ANDROID_RECOVERY_BOOTARGS_MMC="NULL"

CONFIG_FASTBOOT=y

CONFIG_FASTBOOT_SATA_NO=0

CONFIG_UART_BASE_ADDR="UART1_BASE_ADDR"

CONFIG_CMD_SOURCE=y

CONFIG_SPI_FLASH_IMX_M25PXX=y

CONFIG_CMD_BOOTD=y

CONFIG_MXC_FEC=y

CONFIG_MMC_8BIT_PORTS="0xC"

CONFIG_SYS_LONGHELP=y

CONFIG_REF_CLK_FREQ="CONFIG_MX6_HCLK_FREQ"

CONFIG_FASTBOOT_PRODUCT_ID="0x0d02"

CONFIG_CMD_SPI=y

CONFIG_VIDEO_MX5=y

CONFIG_CORE_REGULATOR_NAME="vdd1p1"

CONFIG_CMD_XIMG=y

CONFIG_BOOTDELAY=3

CONFIG_ANDROID_MAIN_MMC_BUS=3

CONFIG_BMP_8BPP=y

CONFIG_SYS_CBSIZE=1024

CONFIG_FASTBOOT_VENDOR_ID="0x18d1"

CONFIG_ANDROID_RECOVERY_BOOTCMD_MMC="booti mmc3 recovery"

CONFIG_ANDROID_RECOVERY_BOOTCMD_SD="booti mmc2 recovery"

CONFIG_CMD_MISC=y

CONFIG_ANDROID_CACHE_PARTITION_MMC=6

CONFIG_ANDROID_RECOVERY_CMD_FILE="/recovery/command"

CONFIG_SYS_64BIT_VSPRINTF=y

CONFIG_FSL_SF=y

CONFIG_DISCOVER_PHY=y

CONFIG_SYS_I2C_SPEED=100000

CONFIG_DISPLAY_CPUINFO=y

CONFIG_CMD_BMP=y

CONFIG_MXC_UART=y

CONFIG_ENV_SECT_SIZE="(8 * 1024)"

CONFIG_SPLASH_SCREEN=y

CONFIG_IPU_V3H=y

CONFIG_USB_DEVICE=y

CONFIG_BOOTP_DNS=y

CONFIG_CMD_MEMORY=y

CONFIG_SYS_MAXARGS=32

CONFIG_ANDROID_BOOT_PARTITION_MMC=y

CONFIG_CMD_RUN=y

CONFIG_IPADDR="192.168.1.103"

CONFIG_SYS_PBSIZE="(CONFIG_SYS_CBSIZE + sizeof(CONFIG_SYS_PROMPT) + 16)"

CONFIG_ANDROID_RECOVERY_PARTITION_MMC=2

CONFIG_I2C_MXC=y

CONFIG_CMDLINE_EDITING=y

CONFIG_SYS_CONSOLE_IS_IN_ENV=y

CONFIG_ANATOP_REGULATOR=y

CONFIG_IMX_MMC=y

CONFIG_NET_RETRY_COUNT=100

CONFIG_IPU_CLKRATE=260000000

CONFIG_SETUP_MEMORY_TAGS=y

CONFIG_LOADADDR="0x10800000"

CONFIG_CMD_BOOTI=y

CONFIG_GET_DDR_TARGET_DELAY=y

CONFIG_SYS_BARGSIZE="CONFIG_SYS_CBSIZE"

CONFIG_AUTO_COMPLETE=y

CONFIG_PERIPH_REGULATOR_NAME="vdd1p1"

CONFIG_ENV_IS_IN_MMC=y

CONFIG_SYS_HZ=1000

CONFIG_CMD_MMC=y

CONFIG_SYS_WHITE_ON_BLACK=y

CONFIG_MX6_HCLK_FREQ=24000000

CONFIG_CMD_SF=y

CONFIG_SPI_FLASH_CS=0

CONFIG_SYS_CONSOLE_ENV_OVERWRITE=y

CONFIG_CMD_DHCP=y

CONFIG_SYS_FSL_USDHC_NUM=4

CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE=y

CONFIG_BOOTP_GATEWAY=y

CONFIG_MX6_CLK32=32768

CONFIG_CMDLINE_TAG=y

CONFIG_PARTITIONS=y

CONFIG_CMD_ENV=y

CONFIG_ARP_TIMEOUT="200UL"

CONFIG_SKIP_RELOCATE_UBOOT=y

CONFIG_SYS_PROMPT="MX6Q SABRESD U-Boot > "

CONFIG_LCD=y

CONFIG_CONS_INDEX=y

CONFIG_SERVERIP="192.168.1.101"

CONFIG_CMD_MII=y

CONFIG_SYS_I2C_PORT="I2C1_BASE_ADDR"

CONFIG_FLASH_HEADER_OFFSET="0x400"