#
# (C) Copyright 2000-2009
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# 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 Foundatio; 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
#
VERSION = 2010
PATCHLEVEL = 03
SUBLEVEL =
EXTRAVERSION =
****uboot版本号的变量定义
ifneq "$(SUBLEVEL)" ""
U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
else
U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL)$(EXTRAVERSION)
endif
****U_BOOT_VERSION赋值=2010.03
TIMESTAMP_FILE = $(obj)include/timestamp_autogenerated.h
****时间戳文件变量
VERSION_FILE = $(obj)include/version_autogenerated.h
****版本文件变量
HOSTARCH := $(shell uname -m |
sed -e s/i.86/i386/
-e s/sun4u/sparc64/
-e s/arm.*/arm/
-e s/sa110/arm/
-e s/powerpc/ppc/
-e s/ppc64/ppc/
-e s/macppc/ppc/)
****首先执行uname -m得到I686,通过管道传送给sed命令,然后sed命令将执行sed -e s/i.86/i386/,将I686替换成i386,最后的结是 HOSTARCH=i386.
HOSTOS := $(shell uname -s | tr '[:upper:]' '[:lower:]' |
sed -e 's/(cygwin).*/cygwin/')
****HOSTOS=Linux
# Set shell to bash if possible, otherwise fall back to sh
SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH;
else if [ -x /bin/bash ]; then echo /bin/bash;
else echo sh; fi; fi)
export HOSTARCH HOSTOS SHELL
****HOSTARCH=i386
HOSTOS=Linux
SHELL=$BASH
# Deal with colliding definitions from tcsh etc.
VENDOR=
#########################################################################
# Allow for silent builds
ifeq (,$(findstring s,$(MAKEFLAGS)))
XECHO = echo
else
XECHO = :
endif
****选择编译的方式，允许沉默编译。findstring函数在MAKEFLAGS环境变量中查找用户是否在命令行中是否加入-s选项
#########################################################################
#
# U-boot build supports producing a object files to the separate external
# directory. Two use cases are supported:
#
# 1) Add O= to the make command line
# 'make O=/tmp/build all'
#
# 2) Set environement variable BUILD_DIR to point to the desired location
# 'export BUILD_DIR=/tmp/build'
# 'make'
#
# The second approach can also be used with a MAKEALL script
# 'export BUILD_DIR=/tmp/build'
# './MAKEALL'
#
# Command line 'O=' setting overrides BUILD_DIR environent variable.
#
# When none of the above methods is used the local build is performed and
# the object files are placed in the source directory.
#
****根据解释可知，可以通过指定命令行选项和定义环境变量的方法，使得目标文件可以存放在别的的目录里面。
ifdef O
ifeq ("$(origin O)", "command line")
****origin函数用于查询变量的出处，此处期望他在命令行中定义
BUILD_DIR := $(O)
****如果命令行定义O，那么BUILD_DIR就等于那个目录
endif
endif
ifneq ($(BUILD_DIR),)
saved-output := $(BUILD_DIR)
# Attempt to create a output directory.
$(shell [ -d ${BUILD_DIR} ] || mkdir -p ${BUILD_DIR})
****当$BUILD_DIR存在或者建立这个目录
# Verify if it was successful.
BUILD_DIR := $(shell cd $(BUILD_DIR) && /bin/pwd)
$(if $(BUILD_DIR),,$(error output directory "$(saved-output)" does not exist))
****目录不存在则抛出错误
endif # ifneq ($(BUILD_DIR),)
OBJTREE := $(if $(BUILD_DIR),$(BUILD_DIR),$(CURDIR))
****当BUILD_DIR存在时则赋给OBJTREE，否则OBJTREE=CURDIR（它代表当前工作目录，应该是个环境变量）
SRCTREE := $(CURDIR)
****源代码目录是当前工作目录
TOPDIR := $(SRCTREE)
****TOPDIR为当前源代码目录
LNDIR := $(OBJTREE)
export TOPDIR SRCTREE OBJTREE
MKCONFIG := $(SRCTREE)/mkconfig
****这个脚本文件很重要
export MKCONFIG
ifneq ($(OBJTREE),$(SRCTREE))
REMOTE_BUILD := 1
export REMOTE_BUILD
endif
****建立外部目录的部分就结束了
# $(obj) and (src) are defined in config.mk but here in main Makefile
# we also need them before config.mk is included which is the case for
# some targets like unconfig, clean, clobber, distclean, etc.
ifneq ($(OBJTREE),$(SRCTREE))
obj := $(OBJTREE)/
src := $(SRCTREE)/
else
obj :=
src :=
endif
export obj src
****抛出两个变量，在后面会用到，分别代表目标文件和源代码目录
# Make sure CDPATH settings don't interfere
unexport CDPATH
****这个变量不晓得干嘛的？
#########################################################################
ifeq ($(ARCH),powerpc)
ARCH = ppc
endif
# The "tools" are needed early, so put this first
# Don't include stuff already done in $(LIBS)
SUBDIRS = tools
examples/standalone
examples/api
.PHONY : $(SUBDIRS)
****定义了几个伪目标，见上面的定义
ifeq ($(obj)include/config.mk,$(wildcard $(obj)include/config.mk))
****'wildcard' 的函 数，它有一个参数，功能是展开成一列所有符合由其参数描述的文件名，文件间以空格间隔。此句是判断$(obj)include/config.mk是否存 在。『当调用make <boardname>_config后将生成config.mk』---（来源于longhaihai'blog)
# Include autoconf.mk before config.mk so that the config options are available
# to all top level build files. We need the dummy all: target to prevent the
# dependency target in autoconf.mk.dep from being the default.
all:
****第一个目标all
sinclude $(obj)include/autoconf.mk.dep
sinclude $(obj)include/autoconf.mk
# load ARCH, BOARD, and CPU configuration
include $(obj)include/config.mk
****这个文件由make <boardname>_config产生，它里面定义了ARCH CPU BOARD VENDOR SOC这几个变量，注意这几个变量都在那里使用了
export ARCH CPU BOARD VENDOR SOC
# set default to nothing for native builds
ifeq ($(HOSTARCH),$(ARCH))
CROSS_COMPILE ?=
endif
****判断主机和目标机的体系结构是否一致，来决定是否交叉编译，此处？=是条件赋值语句，只有变量之前没定义过才赋值
# load other configuration
include $(TOPDIR)/config.mk
****重要的配置脚本总结：
$(SRCTREE)/mkconfig
$(TOPDIR)/config.mk
$(obj)include/autoconf.mk.dep
$(obj)include/autoconf.mk
$(obj)include/config.mk
注意前面两个是在源文件目录，而后两个在目标文件目录，当然他们也可能一样
#########################################################################
# U-Boot objects....order is important (i.e. start must be first)
OBJS = cpu/$(CPU)/start.o
ifeq ($(CPU),i386)
OBJS += cpu/$(CPU)/start16.o
OBJS += cpu/$(CPU)/resetvec.o
endif
ifeq ($(CPU),ppc4xx)
OBJS += cpu/$(CPU)/resetvec.o
endif
ifeq ($(CPU),mpc85xx)
OBJS += cpu/$(CPU)/resetvec.o
endif
OBJS := $(addprefix $(obj),$(OBJS))
****定义OBJS，如果是cpu是arm920t，那么OBJS =$(obj)/cpu/arm920t/start.o
LIBS = lib_generic/libgeneric.a
LIBS += lib_generic/lzma/liblzma.a
LIBS += lib_generic/lzo/liblzo.a
LIBS += $(shell if [ -f board/$(VENDOR)/common/Makefile ]; then echo
"board/$(VENDOR)/common/lib$(VENDOR).a"; fi)
****-f选项表示文件是否存在
LIBS += cpu/$(CPU)/lib$(CPU).a
ifdef SOC
LIBS += cpu/$(CPU)/$(SOC)/lib$(SOC).a
endif
ifeq ($(CPU),ixp)
LIBS += cpu/ixp/npe/libnpe.a
endif
LIBS += lib_$(ARCH)/lib$(ARCH).a
LIBS += fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a fs/jffs2/libjffs2.a
fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a fs/yaffs2/libyaffs2.a
fs/ubifs/libubifs.a
LIBS += net/libnet.a
LIBS += disk/libdisk.a
LIBS += drivers/bios_emulator/libatibiosemu.a
LIBS += drivers/block/libblock.a
LIBS += drivers/dma/libdma.a
LIBS += drivers/fpga/libfpga.a
LIBS += drivers/gpio/libgpio.a
LIBS += drivers/hwmon/libhwmon.a
LIBS += drivers/i2c/libi2c.a
LIBS += drivers/input/libinput.a
LIBS += drivers/misc/libmisc.a
LIBS += drivers/mmc/libmmc.a
LIBS += drivers/mtd/libmtd.a
LIBS += drivers/mtd/nand/libnand.a
LIBS += drivers/mtd/onenand/libonenand.a
LIBS += drivers/mtd/ubi/libubi.a
LIBS += drivers/mtd/spi/libspi_flash.a
LIBS += drivers/net/libnet.a
LIBS += drivers/net/phy/libphy.a
LIBS += drivers/pci/libpci.a
LIBS += drivers/pcmcia/libpcmcia.a
LIBS += drivers/power/libpower.a
LIBS += drivers/spi/libspi.a
ifeq ($(CPU),mpc83xx)
LIBS += drivers/qe/qe.a
endif
ifeq ($(CPU),mpc85xx)
LIBS += drivers/qe/qe.a
LIBS += cpu/mpc8xxx/ddr/libddr.a
LIBS += cpu/mpc8xxx/lib8xxx.a
endif
ifeq ($(CPU),mpc86xx)
LIBS += cpu/mpc8xxx/ddr/libddr.a
LIBS += cpu/mpc8xxx/lib8xxx.a
endif
LIBS += drivers/rtc/librtc.a
LIBS += drivers/serial/libserial.a
LIBS += drivers/twserial/libtws.a
LIBS += drivers/usb/gadget/libusb_gadget.a
LIBS += drivers/usb/host/libusb_host.a
LIBS += drivers/usb/musb/libusb_musb.a
LIBS += drivers/usb/phy/libusb_phy.a
LIBS += drivers/video/libvideo.a
LIBS += drivers/watchdog/libwatchdog.a
LIBS += common/libcommon.a
LIBS += libfdt/libfdt.a
LIBS += api/libapi.a
LIBS += post/libpost.a
LIBS := $(addprefix $(obj),$(LIBS))
****LIBS,包含了后缀为.a的文件，这种文件是在进到到各个目录执行make产生的库文件，链接时需要这些文件。链接的文件涉及到了 lib_generic目录,cpu目录，lib_arm目录（以arm为例子），fs目录，net目录，disk目录，drivers目录。从上面这段 代码就可以清楚的知道，整个u-boot究竟需要什么文件，由哪些文件组成。
****addprefix为增加前缀函数
.PHONY : $(LIBS) $(TIMESTAMP_FILE) $(VERSION_FILE)
****声明伪目标，在后面的编译中用
LIBBOARD = board/$(BOARDDIR)/lib$(BOARD).a
LIBBOARD := $(addprefix $(obj),$(LIBBOARD))
****与开发板相关的库目标文件，这视乎和$(BOARDDIR)定义有关，好想没看到，在之前的u-boot的Makefile里面是定义为BOARDDIR=$(BOARD)
# Add GCC lib
ifdef USE_PRIVATE_LIBGCC
ifeq ("$(USE_PRIVATE_LIBGCC)", "yes")
PLATFORM_LIBGCC = -L $(OBJTREE)/lib_$(ARCH) -lgcc
else
PLATFORM_LIBGCC = -L $(USE_PRIVATE_LIBGCC) -lgcc
endif
else
PLATFORM_LIBGCC = -L $(shell dirname `$(CC) $(CFLAGS) -print-libgcc-file-name`) -lgcc
****CC和CFLAGS都是make的隐含变量，CC表示C编译器，cflags表示执行CC时的命令行参数。当然是交叉编译，其定义在config.mk里（根目录下），这也是一个很重要的文件，用于定义编译连接工具和选项的文件
endif
PLATFORM_LIBS += $(PLATFORM_LIBGCC)
export PLATFORM_LIBS
# Special flags for CPP when processing the linker script.
# Pass the version down so we can handle backwards compatibility
# on the fly.
LDPPFLAGS +=
-include $(TOPDIR)/include/u-boot/u-boot.lds.h
$(shell $(LD) --version |
sed -ne 's/GNU ld version ([0-9][0-9]*).([0-9][0-9]*).*/-DLD_MAJOR=1 -DLD_MINOR=2/p')
ifeq ($(CONFIG_NAND_U_BOOT),y)
NAND_SPL = nand_spl
U_BOOT_NAND = $(obj)u-boot-nand.bin
endif
ifeq ($(CONFIG_ONENAND_U_BOOT),y)
ONENAND_IPL = onenand_ipl
U_BOOT_ONENAND = $(obj)u-boot-onenand.bin
ONENAND_BIN ?= $(obj)onenand_ipl/onenand-ipl-2k.bin
endif
****包含u-boot.lds.h,如果定义从Nandflash启动，就定义变量U_BOOT_ONENAND =$(obj)u-boot-onenand.bin.
__OBJS := $(subst $(obj),,$(OBJS))
****去掉前缀，__OBJS=cpu/arm920t/start.o
__LIBS := $(subst $(obj),,$(LIBS)) $(subst $(obj),,$(LIBBOARD))
****去掉前缀，__LIBS=$(LIBS)+$(LIBBOARD)，当然是去掉前缀部分
#########################################################################
#########################################################################
# Always append ALL so that arch config.mk's can add custom ones
ALL += $(obj)u-boot.srec $(obj)u-boot.bin $(obj)System.map $(U_BOOT_NAND) $(U_BOOT_ONENAND)
all: $(ALL)
****当输入命令 make all,讲寻找到此次的伪目标all，all依赖于 $(ALL),ALL由5部分组成。那么接下去就分别对这5部分进行递归的处理。（贴出来格式变了，最好自己看源码）。看到308行，
（1）目标文件u-boot.bin依赖于 $(obj)u-boot目标，可以在344行找到；
（1.1）$(obj)u-boot依赖于：depend $(SUBDIRS) $(OBJS) $(LIBBOARD) $(LIBS) $(LDSCRIPT) $(obj)u-boot.lds；
（1.1.1）depend；402行。执行的操作为：进入到$(SUBDIRS)，生成各个子目
录的.depend文件。通过调用各个子目录的make _depend。
（1.1.2）$(SUBDIRS)；363行。依赖depend。执行操作为：对各个子目录执行
makefile文件。
(1.1.3) $(OBJS);354行。依赖depend。执行：
$(MAKE) -C cpu/$(CPU) $(if $(REMOTE_BUILD),$@,$(notdir $@))
如果cpu为arm920t，编译文件cpu/arm920t。
(1.1.4) $(LIBS) ;357行。依赖$(SUBDIRS).执行操作为：
$(MAKE) -C $(dir $(subst $(obj),,$@))，
dir为GNU内嵌函数为取目录操作，比如$(dir a/b/c) 结果为
a/b/;subst 也是GNU内嵌函数$(subst from,to,text)表示在text
中把form 字符串替换为字符串to。subst资料上面是这样讲的。但是
在此处，我认为是：$(subst text， to， from)。总之，这样理解
吧：在LIBS包含的n个路径下面执行make
(1.1.5) $(LIBBOARD);360行。依赖depend，$（LIBS）。执行：
$(MAKE) -C $(dir $(subst $(obj),,$@))。
再在之前，$(LIBS)已经执行完毕，现在obj只剩下了：LIBBOAED路径
集合了。在这些路径集合下面执行make。
(1.1.6) $(LDSCRIPT);336行。依赖depend。执行：
$(MAKE) -C $(dir $@) $(notdir $@)，notdir为取文件名函数，
比如，$(notdir a/my.o)结果为my.o。
(1.1.7) $(obj)u-boot.lds。369行。依赖$(LDSCRIPT).执行：
$(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - <$^ >$@
生成链接文件。
*****上面这段文字引自：http://blog.chinaunix.net/u3/108840/showart_2135045.html
$(obj)u-boot.hex: $(obj)u-boot
$(OBJCOPY) ${OBJCFLAGS} -O ihex $< $@
$(obj)u-boot.srec: $(obj)u-boot
$(OBJCOPY) -O srec $< $@
$(obj)u-boot.bin: $(obj)u-boot
$(OBJCOPY) ${OBJCFLAGS} -O binary $< $@
$(obj)u-boot.ldr: $(obj)u-boot
$(CREATE_LDR_ENV)
$(LDR) -T $(CONFIG_BFIN_CPU) -c $@ $< $(LDR_FLAGS)
$(obj)u-boot.ldr.hex: $(obj)u-boot.ldr
$(OBJCOPY) ${OBJCFLAGS} -O ihex $< $@ -I binary
$(obj)u-boot.ldr.srec: $(obj)u-boot.ldr
$(OBJCOPY) ${OBJCFLAGS} -O srec $< $@ -I binary
$(obj)u-boot.img: $(obj)u-boot.bin
./tools/mkimage -A $(ARCH) -T firmware -C none
-a $(TEXT_BASE) -e 0
-n $(shell sed -n -e 's/.*U_BOOT_VERSION//p' $(VERSION_FILE) |
sed -e 's/"[ ]*$$/ for $(BOARD) board"/')
-d $< $@
$(obj)u-boot.imx: $(obj)u-boot.bin
$(obj)tools/mkimage -n $(IMX_CONFIG) -T imximage
-e $(TEXT_BASE) -d $< $@
$(obj)u-boot.kwb: $(obj)u-boot.bin
$(obj)tools/mkimage -n $(KWD_CONFIG) -T kwbimage
-a $(TEXT_BASE) -e $(TEXT_BASE) -d $< $@
$(obj)u-boot.sha1: $(obj)u-boot.bin
$(obj)tools/ubsha1 $(obj)u-boot.bin
$(obj)u-boot.dis: $(obj)u-boot
$(OBJDUMP) -d $< > $@
GEN_UBOOT =
UNDEF_SYM=`$(OBJDUMP) -x $(LIBBOARD) $(LIBS) |
sed -n -e 's/.*($(SYM_PREFIX)__u_boot_cmd_.*)/-u1/p'|sort|uniq`;
cd $(LNDIR) && $(LD) $(LDFLAGS) $$UNDEF_SYM $(__OBJS)
--start-group $(__LIBS) --end-group $(PLATFORM_LIBS)
-Map u-boot.map -o u-boot
$(obj)u-boot: depend $(SUBDIRS) $(OBJS) $(LIBBOARD) $(LIBS) $(LDSCRIPT) $(obj)u-boot.lds
****LDSCRIPT是一个和nand相关的的u-boot.lds的脚本？
$(GEN_UBOOT)
ifeq ($(CONFIG_KALLSYMS),y)
smap=`$(call SYSTEM_MAP,u-boot) |
awk '$$2 ~ /[tTwW]/ {printf $$1 $$3 "\\000"}'` ;
$(CC) $(CFLAGS) -DSYSTEM_MAP=""$${smap}""
-c common/system_map.c -o $(obj)common/system_map.o
$(GEN_UBOOT) $(obj)common/system_map.o
endif
****产生Elf格式的U-boot，用于其它目标的转换
$(OBJS): depend
$(MAKE) -C cpu/$(CPU) $(if $(REMOTE_BUILD),$@,$(notdir $@))
$(LIBS): depend $(SUBDIRS)
$(MAKE) -C $(dir $(subst $(obj),,$@))
$(LIBBOARD): depend $(LIBS)
$(MAKE) -C $(dir $(subst $(obj),,$@))
$(SUBDIRS): depend
$(MAKE) -C $@ all
$(LDSCRIPT): depend
$(MAKE) -C $(dir $@) $(notdir $@)
$(obj)u-boot.lds: $(LDSCRIPT)
$(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - <$^ >$@
$(NAND_SPL): $(TIMESTAMP_FILE) $(VERSION_FILE) $(obj)include/autoconf.mk
$(MAKE) -C nand_spl/board/$(BOARDDIR) all
$(U_BOOT_NAND): $(NAND_SPL) $(obj)u-boot.bin
cat $(obj)nand_spl/u-boot-spl-16k.bin $(obj)u-boot.bin > $(obj)u-boot-nand.bin
$(ONENAND_IPL): $(TIMESTAMP_FILE) $(VERSION_FILE) $(obj)include/autoconf.mk
$(MAKE) -C onenand_ipl/board/$(BOARDDIR) all
$(U_BOOT_ONENAND): $(ONENAND_IPL) $(obj)u-boot.bin
cat $(ONENAND_BIN) $(obj)u-boot.bin > $(obj)u-boot-onenand.bin
$(VERSION_FILE):
@( printf '#define U_BOOT_VERSION "U-Boot %s%s"
' "$(U_BOOT_VERSION)"
'$(shell $(TOPDIR)/tools/setlocalversion $(TOPDIR))' ) > $@.tmp
@cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@
$(TIMESTAMP_FILE):
@date +'#define U_BOOT_DATE "%b %d %C%y"' > $@
@date +'#define U_BOOT_TIME "%T"' >> $@
gdbtools:
$(MAKE) -C tools/gdb all || exit 1
updater:
$(MAKE) -C tools/updater all || exit 1
env:
$(MAKE) -C tools/env all MTD_VERSION=${MTD_VERSION} || exit 1
# Explicitly make _depend in subdirs containing multiple targets to prevent
# parallel sub-makes creating .depend files simultaneously.
depend dep: $(TIMESTAMP_FILE) $(VERSION_FILE) $(obj)include/autoconf.mk
for dir in $(SUBDIRS) cpu/$(CPU) $(dir $(LDSCRIPT)) ; do
$(MAKE) -C $$dir _depend ; done
TAG_SUBDIRS = $(SUBDIRS)
TAG_SUBDIRS += $(dir $(__LIBS))
TAG_SUBDIRS += include
tags ctags:
ctags -w -o $(obj)ctags `find $(TAG_SUBDIRS)
-name '*.[chS]' -print`
etags:
etags -a -o $(obj)etags `find $(TAG_SUBDIRS)
-name '*.[chS]' -print`
cscope:
find $(TAG_SUBDIRS) -name '*.[chS]' -print > cscope.files
cscope -b -q -k
SYSTEM_MAP =
$(NM) $1 |
grep -v '(compiled)|(.o$$)|( [aUw] )|(..ng$$)|(LASH[RL]DI)' |
LC_ALL=C sort
$(obj)System.map: $(obj)u-boot
@$(call SYSTEM_MAP,$<) > $(obj)System.map
#
# Auto-generate the autoconf.mk file (which is included by all makefiles)
#
# This target actually generates 2 files; autoconf.mk and autoconf.mk.dep.
# the dep file is only include in this top level makefile to determine when
# to regenerate the autoconf.mk file.
$(obj)include/autoconf.mk.dep: $(obj)include/config.h include/common.h
@$(XECHO) Generating $@ ;
set -e ;
: Generate the dependancies ;
$(CC) -x c -DDO_DEPS_ONLY -M $(HOSTCFLAGS) $(CPPFLAGS)
-MQ $(obj)include/autoconf.mk include/common.h > $@
$(obj)include/autoconf.mk: $(obj)include/config.h
@$(XECHO) Generating $@ ;
set -e ;
: Extract the config macros ;
$(CPP) $(CFLAGS) -DDO_DEPS_ONLY -dM include/common.h |
sed -n -f tools/scripts/define2mk.sed > $@.tmp &&
mv $@.tmp $@
#########################################################################
else # !config.mk
all $(obj)u-boot.hex $(obj)u-boot.srec $(obj)u-boot.bin
$(obj)u-boot.img $(obj)u-boot.dis $(obj)u-boot
$(filter-out tools,$(SUBDIRS)) $(TIMESTAMP_FILE) $(VERSION_FILE) gdbtools
updater env depend dep tags ctags etags cscope $(obj)System.map:
@echo "System not configured - see README" >&2
@ exit 1
tools:
$(MAKE) -C tools
tools-all:
$(MAKE) -C tools HOST_TOOLS_ALL=y
endif # config.mk
.PHONY : CHANGELOG
CHANGELOG:
git log --no-merges U-Boot-1_1_5.. |
unexpand -a | sed -e 's/ss*$$//' > $@
include/license.h: tools/bin2header COPYING
cat COPYING | gzip -9 -c | ./tools/bin2header license_gzip > include/license.h
#########################################################################
unconfig:
@rm -f $(obj)include/config.h $(obj)include/config.mk
$(obj)board/*/config.tmp $(obj)board/*/*/config.tmp
$(obj)include/autoconf.mk $(obj)include/autoconf.mk.dep
%: %_config
$(MAKE)
Makefile就分析到这，对all目标建立过程这段还是分析的很粗糙，这段主要是参考网友的观点，我现在SHELL这块还很薄弱，先分析到这，以后再补充。下面分析mkconfig文件。