arm9_uboot_Makefile结构分析

发布时间：2020-12-16 09:15:08 所属栏目：百科来源：网络整理

导读：1.解压缩 tar xjf u-boot-1.1.6.tar.bz2 2.打补丁 patch -p1 ../u-boot-1.1.6_jz2440.patch 3.配置 make 100ask24x0_config，下面为Makefile MKCONFIG := $(SRCTREE)/mkconfig unconfig: #清楚配置信息 ????@rm?-f?$(obj)include/config.h?$(obj)include/con

1.解压缩

tar xjf u-boot-1.1.6.tar.bz2

2.打补丁

patch -p1 < ../u-boot-1.1.6_jz2440.patch

3.配置

make 100ask24x0_config，下面为Makefile


MKCONFIG    := $(SRCTREE)/mkconfig

unconfig:　　　　　　#清楚配置信息

????@rm?-f?$(obj)include/config.h?$(obj)include/config.mk?

????????$(obj)board/*/config.tmp?$(obj)board/*/*/config.tmp

100ask24x0_config???:???unconfig

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

#上面这段翻译为：mkconfig 100ask24x0 ?arm?arm920t?100ask24x0?NULL?s3c24x0

make 100ask24x0_config这个命令执行的就是?mkconfig 100ask24x0 ?arm?arm920t?100ask24x0?NULL?s3c24x0这个脚本，下面我们看下mkconfig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

#?mkconfig?100ask24x0??arm?arm920t?100ask24x0?NULL?s3c24x0

#?$0?????????$1?????????$2???$3??????$4???????$5?????$6

[?"${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

????cd?./include

????rm?-f?asm

????ln?-s?asm-$2?asm??#ln?-s?asm-arm?asm?创建链接文件，以指定特定架构

rm?-f?asm-$2/arch

ln?-s?${LNPREFIX}arch-$6?asm-$2/arch? ?#ln -s arch-s3c24x0 asm-arm/arch

if?[?"$2"?=?"arm"?]?;?then

????rm?-f?asm-$2/proc

????ln?-s?${LNPREFIX}proc-armv?asm-$2/proc? #ln -s?proc-armv?asm-arm/proc

#?Create?include?file?for?Make

echo?"ARCH???=?$2"?>??config.mk? #新建

echo?"CPU????=?$3"?>>?config.mk? #添加

echo?"BOARD??=?$4"?>>?config.mk? #添加

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

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

#?Create?board?specific?header?file

if?[?"$APPEND"?=?"yes"?]????#?Append?to?existing?config?file

then

????echo?>>?config.h??

else

????>?config.h??????#?新建

echo?"/*?Automatically?generated?-?do?not?edit?*/"?>>config.h

echo?"#include?<configs/$1.h>"?>>config.h

exit?0

mkconfig新建的文件打印内容如下：

4.编译

make

继续提取Makefile一些主要成分:

# load ARCH,BOARD,and CPU configuration
include $(OBJTREE)/include/config.mk

ifeq ($(ARCH),arm)
CROSS_COMPILE = arm-linux-

# U-Boot objects....order is important (i.e. start must be first)
OBJS  = cpu/$(CPU)/start.o

LIBS  = lib_generic/libgeneric.a
LIBS += board/$(BOARDDIR)/lib$(BOARD).a
LIBS += cpu/$(CPU)/lib$(CPU).a

ALL = $(obj)u-boot.srec $(obj)u-boot.bin $(obj)System.map $(U_BOOT_NAND)
all:        $(ALL)

$(obj)u-boot.bin:???$(obj)u-boot

????????$(OBJCOPY)?${OBJCFLAGS}?-O?binary?$<? [email?protected]

$(obj)u-boot:???????depend?version?$(SUBDIRS)?$(OBJS)?$(LIBS)?$(LDSCRIPT)

????????UNDEF_SYM=`$(OBJDUMP)?-x?$(LIBS)?|sed??-n?-e?‘s/.*(__u_boot_cmd_.*)/-u1/p‘|sort|uniq`;

????????cd?$(LNDIR)?&&?$(LD)?$(LDFLAGS)?$$UNDEF_SYM?$(__OBJS)?

????????????--start-group?$(__LIBS)?--end-group?$(PLATFORM_LIBS)?

????????????-Map?u-boot.map?-o?u-boot

# LDFLAGS在根目录config.mk中： LDFLAGS?+=?-Bstatic?-T?$(LDSCRIPT)?-Ttext?$(TEXT_BASE)?$(PLATFORM_LDFLAGS)

? #?TEXT_BASE在board/100ask24x0/config.mk中：?TEXT_BASE = 0x33F80000

再看一下u-boot.lds

/*
 * (C) Copyright 2002
 * Gary Jennejohn,DENX Software Engineering,<[email?protected]>
 *
 * 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
 */

OUTPUT_FORMAT("elf32-littlearm","elf32-littlearm","elf32-littlearm")
/*OUTPUT_FORMAT("elf32-arm","elf32-arm","elf32-arm")*/
OUTPUT_ARCH(arm)
ENTRY(_start)
SECTIONS
{
    . = 0x00000000; //0x33F80000这个地址是0x30000000+64M-512Kb所在位置，当uboot大于512就要修改这个地址

    . = ALIGN(4);
    .text      :
    {
      cpu/arm920t/start.o    (.text)
          board/100ask24x0/boot_init.o (.text)
      *(.text)
    }

    . = ALIGN(4);
    .rodata : { *(.rodata) }

    . = ALIGN(4);
    .data : { *(.data) }

    . = ALIGN(4);
    .got : { *(.got) }

    . = .;
    __u_boot_cmd_start = .;
    .u_boot_cmd : { *(.u_boot_cmd) }
    __u_boot_cmd_end = .;

    . = ALIGN(4);
    __bss_start = .;
    .bss : { *(.bss) }
    _end = .;
}

（编辑：李大同）

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