u-boot的配置过程分析

其他 2018-10-18 11:01:54 阅读次数: 0

前面在分析主makefile的时候，我们知道执行make 100ask24x0_config这个命令会在include目录下创建一个config.mk文件。

那么为什么编译就会生成这个文件呢？我们来看下这个命令究竟做了什么，在主Makefile中我们可以找到以下命令：

100ask24x0_config	:	unconfig
	@$(MKCONFIG) $(@:_config=) arm arm920t 100ask24x0 NULL s3c24x0

首先我们看这个命令的依赖：unconfig

unconfig:
	@rm -f $(obj)include/config.h $(obj)include/config.mk \
		$(obj)board/*/config.tmp $(obj)board/*/*/config.tmp

其实就是删除之前配置好的文件。

1.  $(@:_config=)

$@表示 规则的目标文件名，@在$()中与$@一样，表示规则中的目标文件。同时在makefile中，$(var:a=b)表示 变量值的替换。

把变量"var"( 即$(var) )中的所有以"a"字串"结尾"的"a"替换成"b"字串。

100ask24x0_config里的_config部分用空替换，得到：100ask24x0，这就是第一个参数

$1: 100ask24x0

$2: arm

$3: arm920t

$4: 100ask24x0

$5: NULL

$6: s3c24x0

所以，$# = 6

2.@$(MKCONFIG)

@表示静默编译，MKCONFIG是一个全局变量，其实就代表根目录下的mkconfig

MKCONFIG	:= $(SRCTREE)/mkconfig
export MKCONFIG

所以在我们执行 make 100ask24x0_config命令的时候，其实就是运行这个脚本文件，并传输给这个脚本6个参数。

3.mkconfig脚本文件分析

1.设定BOARD_NAME

APPEND=no	# Default: Create new config file
BOARD_NAME=""	# Name to print in make output

while [ $# -gt 0 ] ; do
	case "$1" in
	--) shift ; break ;;
	-a) shift ; APPEND=yes ;;
	-n) shift ; BOARD_NAME="${1%%_config}" ; shift ;;
	*)  break ;;
	esac
done

[ "${BOARD_NAME}" ] || BOARD_NAME="$1"

$#是传进来参数的总的个数 是6，大于零，执行case语句

$1 = 100ask24x0，能匹配的是*（万能匹配），然后BREAK，直接跳出WHILE循环

BOARD_NAME是空，所以中括号里面是FAULSE，所以要继续执行BOARD_NAME="$1"

所以以上代码执行的效果就是BOARD_NAME = 100ask24x0

 

2.判断传输的参数，打印提示

[ $# -lt 4 ] && exit 1
[ $# -gt 6 ] && exit 1

echo "Configuring for ${BOARD_NAME} board..."

 如果$#小于4，则exit 1（mkconfig脚本返回1），如果$#大于6，则也返回1.

3.创建符号链接

#
# Create link to architecture specific headers
#
if [ "$SRCTREE" != "$OBJTREE" ] ; then
	mkdir -p ${OBJTREE}/include
	mkdir -p ${OBJTREE}/include2
	cd ${OBJTREE}/include2
	rm -f asm
	ln -s ${SRCTREE}/include/asm-$2 asm
	LNPREFIX="../../include2/asm/"
	cd ../include
	rm -rf asm-$2
	rm -f asm
	mkdir asm-$2
	ln -s asm-$2 asm
else
	cd ./include
	rm -f asm
	ln -s asm-$2 asm
fi

rm -f asm-$2/arch

if [ -z "$6" -o "$6" = "NULL" ] ; then
	ln -s ${LNPREFIX}arch-$3 asm-$2/arch
else
	ln -s ${LNPREFIX}arch-$6 asm-$2/arch
fi

if [ "$2" = "arm" ] ; then
	rm -f asm-$2/proc
	ln -s ${LNPREFIX}proc-armv asm-$2/proc
fi

第一个：在include目录下创建asm文件，指向asm-arm。

    cd ./include
    rm -f asm
    ln -s asm-$2 asm

注意:这个地方已经进入./include文件夹下，所以后面的操作都是在这个文件夹下

第二个：在inlcude/asm-arm下创建一个arch文件，指向include/asm-arm/arch-s3c24x0

if [ -z "$6" -o "$6" = "NULL" ] ; then
    ln -s ${LNPREFIX}arch-$3 asm-$2/arch
else
    ln -s ${LNPREFIX}arch-$6 asm-$2/arch
fi

第六个参数为空或者位NULL， 执行ln -s ${LNPREFIX}arch-$3 asm-$2/arch，否则执行 ln -s ${LNPREFIX}arch-$6 asm-$2/arch

4.创建并追加include/config文件

#
# Create include file for Make
#
echo "ARCH   = $2" >  config.mk
echo "CPU    = $3" >> config.mk
echo "BOARD  = $4" >> config.mk

[ "$5" ] && [ "$5" != "NULL" ] && echo "VENDOR = $5" >> config.mk

[ "$6" ] && [ "$6" != "NULL" ] && echo "SOC    = $6" >> config.mk

执行完之后的文件内容如下：

5.创建头文件

#
# Create board specific header file
#
if [ "$APPEND" = "yes" ]	# Append to existing config file
then
	echo >> config.h
else
	> config.h		# Create new config file
fi
echo "/* Automatically generated - do not edit */" >>config.h
echo "#include <configs/$1.h>" >>config.h

创建一个config.h，并且追加内容：

/* Automatically generated - do not edit */

#include <configs/$1.h>

追加完成之后：

附：脚本文件的源代码

所以，100ask24x0.h这个头文件是十分重要的，关乎整个工程的配置。

头文件的所有内容如下：

/*
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <[email protected]>
 * Gary Jennejohn <[email protected]>
 * David Mueller <[email protected]>
 *
 * Configuation settings for the SAMSUNG SMDK2410 board.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#ifndef __CONFIG_H
#define __CONFIG_H

/*
 * High Level Configuration Options
 * (easy to change)
 */
#define CONFIG_ARM920T		1	/* This is an ARM920T Core	*/
#define	CONFIG_S3C2410		1	/* in a SAMSUNG S3C2410 SoC     */
#define CONFIG_SMDK2410		1	/* on a SAMSUNG SMDK2410 Board  */

/* input clock of PLL */
#define CONFIG_SYS_CLK_FREQ	12000000 /* the SMDK2410 has 12MHz input clock */
//#define CONFIG_SYS_CLK_FREQ	16934400 /* the SMDK2410 has 12MHz input clock */


#define USE_920T_MMU		1

#define CONFIG_USB_DEVICE   1

#ifdef CONFIG_USB_DEVICE
#define CONFIG_USE_IRQ		1
#endif

#define CONFIG_JFFS2_CMDLINE 1
#define CONFIG_JFFS2_NAND    1

#define MTDIDS_DEFAULT "nand0=nandflash0"
#define MTDPARTS_DEFAULT "mtdparts=nandflash0:256k@0(bootloader)," \
                            "128k(params)," \
                            "2m(kernel)," \
                            "-(root)"

/*
 * Size of malloc() pool
 */
#define CFG_MALLOC_LEN		(CFG_ENV_SIZE + 128*1024)
#define CFG_GBL_DATA_SIZE	128	/* size in bytes reserved for initial data */

/*
 * Hardware drivers
 */
#if 1
#if 0
#define CONFIG_DRIVER_CS8900	1	/* we have a CS8900 on-board */
#define CS8900_BASE		0x19000300
#define CS8900_BUS16		1 /* the Linux driver does accesses as shorts */
#endif

#if !defined(CONFIG_DRIVER_CS8900)
#define CONFIG_DRIVER_DM9000		1
#define CONFIG_DM9000_USE_16BIT 	1
#define CONFIG_DM9000_BASE			0x20000000
#define DM9000_IO					0x20000000  
#define DM9000_DATA					0x20000004
#endif
#endif
/*
 * select serial console configuration
 */
#define CONFIG_SERIAL1          1	/* we use SERIAL 1 on SMDK2410 */

/************************************************************
 * RTC
 ************************************************************/
#define	CONFIG_RTC_S3C24X0	1

/* allow to overwrite serial and ethaddr */
#define CONFIG_ENV_OVERWRITE

#define CONFIG_BAUDRATE		115200

/* for tag(s) to transfer message to kernel, www.100ask.net */
#define CONFIG_SETUP_MEMORY_TAGS    1
#define CONFIG_CMDLINE_TAG          1

/***********************************************************
 * Command definition
 ***********************************************************/
#define CONFIG_COMMANDS \
                        ((CONFIG_CMD_DFL | \
                        CFG_CMD_CACHE    | \
                    /* Start: by www.100ask.net */ \
                        CFG_CMD_PING     | \
                        CFG_CMD_JFFS2    | \
                        CFG_CMD_NAND     | \
                    /* End: by www.100ask.net */ \
                        /*CFG_CMD_EEPROM |*/ \
                        /*CFG_CMD_I2C    |*/ \
                        /*CFG_CMD_USB    |*/ \
                        CFG_CMD_REGINFO  | \
                        CFG_CMD_DATE     | \
                        CFG_CMD_ELF))


/* this must be included AFTER the definition of CONFIG_COMMANDS (if any) */
#include <cmd_confdefs.h>

#define CONFIG_BOOTDELAY	2
#define CONFIG_BOOTARGS    	"noinitrd root=/dev/mtdblock3 init=/linuxrc console=ttySAC0"
#define CONFIG_ETHADDR	    08:00:3e:26:0a:5b
#define CONFIG_NETMASK      255.255.255.0
#define CONFIG_IPADDR		192.168.7.17
#define CONFIG_SERVERIP		192.168.7.11
/*#define CONFIG_BOOTFILE	"elinos-lart" */
#define CONFIG_BOOTCOMMAND	"nand read.jffs2 0x30007FC0 kernel; bootm 0x30007FC0"

#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
#define CONFIG_KGDB_BAUDRATE	115200		/* speed to run kgdb serial port */
/* what's this ? it's not used anywhere */
#define CONFIG_KGDB_SER_INDEX	1		/* which serial port to use */
#endif

/*
 * Miscellaneous configurable options
 */
#define	CFG_LONGHELP				/* undef to save memory		*/
#define	CFG_PROMPT		"OpenJTAG> "	/* Monitor Command Prompt	*/
#define	CFG_CBSIZE		256		/* Console I/O Buffer Size	*/
#define	CFG_PBSIZE (CFG_CBSIZE+sizeof(CFG_PROMPT)+16) /* Print Buffer Size */
#define	CFG_MAXARGS		16		/* max number of command args	*/
#define CFG_BARGSIZE		CFG_CBSIZE	/* Boot Argument Buffer Size	*/

#define CFG_MEMTEST_START	0x30000000	/* memtest works on	*/
#define CFG_MEMTEST_END		0x33F00000	/* 63 MB in DRAM	*/

#undef  CFG_CLKS_IN_HZ		/* everything, incl board info, in Hz */

#define	CFG_LOAD_ADDR		0x33000000	/* default load address	*/

/* the PWM TImer 4 uses a counter of 15625 for 10 ms, so we need */
/* it to wrap 100 times (total 1562500) to get 1 sec. */
#define	CFG_HZ			1562500

/* valid baudrates */
#define CFG_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200 }

/*-----------------------------------------------------------------------
 * Stack sizes
 *
 * The stack sizes are set up in start.S using the settings below
 */
#define CONFIG_STACKSIZE	(128*1024)	/* regular stack */
#ifdef CONFIG_USE_IRQ
#define CONFIG_STACKSIZE_IRQ	(4*1024)	/* IRQ stack */
#define CONFIG_STACKSIZE_FIQ	(4*1024)	/* FIQ stack */
#endif

/*-----------------------------------------------------------------------
 * Physical Memory Map
 */
#define CONFIG_NR_DRAM_BANKS	1	   /* we have 1 bank of DRAM */
#define PHYS_SDRAM_1		0x30000000 /* SDRAM Bank #1 */
#define PHYS_SDRAM_1_SIZE	0x04000000 /* 64 MB */

#define PHYS_FLASH_1		0x00000000 /* Flash Bank #1 */

#define CFG_FLASH_BASE		PHYS_FLASH_1
#define CFG_MONITOR_BASE	PHYS_FLASH_1


/*-----------------------------------------------------------------------
 * FLASH and environment organization
 */

#if 0
#define CONFIG_AMD_LV400	1	/* uncomment this if you have a LV400 flash */
#endif
//#define CONFIG_AMD_LV800	1	/* uncomment this if you have a LV800 flash */

#define CFG_MAX_FLASH_BANKS	1	/* max number of memory banks */
#ifdef CONFIG_AMD_LV800
#define PHYS_FLASH_SIZE		0x00100000 /* 1MB */
#define CFG_MAX_FLASH_SECT	(19)	/* max number of sectors on one chip */
#define CFG_ENV_ADDR		(CFG_FLASH_BASE + 0x0F0000) /* addr of environment */
#endif
#ifdef CONFIG_AMD_LV400
#define PHYS_FLASH_SIZE		0x00080000 /* 512KB */
#define CFG_MAX_FLASH_SECT	(11)	/* max number of sectors on one chip */
#define CFG_ENV_ADDR		(CFG_FLASH_BASE + 0x070000) /* addr of environment */
#endif

#define CFG_FLASH_CFI				1
#define CFG_FLASH_CFI_DRIVER 		1
#define CFG_FLASH_USE_BUFFER_WRITE	1
#define CONFIG_FLASH_CFI_LEGACY		1

#ifdef CFG_FLASH_CFI_DRIVER
#define CFG_MAX_FLASH_SECT	 512   /* max number of sectors on one chip */
#define CFG_FLASH_CFI_WIDTH  0x02  /* FLASH_CFI_16BIT */
#endif

/* timeout values are in ticks */
#define CFG_FLASH_ERASE_TOUT	(5*CFG_HZ) /* Timeout for Flash Erase */
#define CFG_FLASH_WRITE_TOUT	(5*CFG_HZ) /* Timeout for Flash Write */

//#define	CFG_ENV_IS_IN_FLASH	1
#define CFG_ENV_IS_IN_NAND  1
#define CFG_ENV_OFFSET      0x40000
#define CFG_ENV_SIZE		0x20000	/* Total Size of Environment Sector */

/*-----------------------------------------------------------------------
 * NAND flash settings
 */
#define CFG_NAND_BASE           0
#define CFG_MAX_NAND_DEVICE     1
#define NAND_MAX_CHIPS          1

#endif	/* __CONFIG_H */

附： mkconfig脚本文件

#!/bin/sh -e

# Script to create header files and links to configure
# U-Boot for a specific board.
#
# Parameters:  Target  Architecture  CPU  Board [VENDOR] [SOC]
#
# (C) 2002-2006 DENX Software Engineering, Wolfgang Denk <[email protected]>
#

APPEND=no	# Default: Create new config file
BOARD_NAME=""	# Name to print in make output

while [ $# -gt 0 ] ; do
	case "$1" in
	--) shift ; break ;;
	-a) shift ; APPEND=yes ;;
	-n) shift ; BOARD_NAME="${1%%_config}" ; shift ;;
	*)  break ;;
	esac
done

[ "${BOARD_NAME}" ] || BOARD_NAME="$1"

[ $# -lt 4 ] && exit 1
[ $# -gt 6 ] && exit 1

echo "Configuring for ${BOARD_NAME} board..."

#
# Create link to architecture specific headers
#
if [ "$SRCTREE" != "$OBJTREE" ] ; then
	mkdir -p ${OBJTREE}/include
	mkdir -p ${OBJTREE}/include2
	cd ${OBJTREE}/include2
	rm -f asm
	ln -s ${SRCTREE}/include/asm-$2 asm
	LNPREFIX="../../include2/asm/"
	cd ../include
	rm -rf asm-$2
	rm -f asm
	mkdir asm-$2
	ln -s asm-$2 asm
else
	cd ./include
	rm -f asm
	ln -s asm-$2 asm
fi

rm -f asm-$2/arch

if [ -z "$6" -o "$6" = "NULL" ] ; then
	ln -s ${LNPREFIX}arch-$3 asm-$2/arch
else
	ln -s ${LNPREFIX}arch-$6 asm-$2/arch
fi

if [ "$2" = "arm" ] ; then
	rm -f asm-$2/proc
	ln -s ${LNPREFIX}proc-armv asm-$2/proc
fi

#
# Create include file for Make
#
echo "ARCH   = $2" >  config.mk
echo "CPU    = $3" >> config.mk
echo "BOARD  = $4" >> config.mk

[ "$5" ] && [ "$5" != "NULL" ] && echo "VENDOR = $5" >> config.mk

[ "$6" ] && [ "$6" != "NULL" ] && echo "SOC    = $6" >> config.mk

#
# Create board specific header file
#
if [ "$APPEND" = "yes" ]	# Append to existing config file
then
	echo >> config.h
else
	> config.h		# Create new config file
fi
echo "/* Automatically generated - do not edit */" >>config.h
echo "#include <configs/$1.h>" >>config.h

exit 0

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