摘自: http://blog.csdn.net/zsy2020314/article/details/9824035
當時寫的時候看的是2012-10版本的,但是略對比了一遍和2013.01.01沒什麼改動,所以這不影響對2013.01.01版本的makefile的理解。本文比較側重於語法句意的分析,框架性的原理網上已經有很多,makefile在變但原理始終不變,只要理解了其中一個版本,對於其他版本的理解來說就應該不存在問題了。
- #########################################################################
- # (C) Copyright 2000-2012
- # Wolfgang Denk, 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
- #########################################################################
- # 從2008年10月,發行版的名稱的含義發生了變化,從數字版本號變爲使用時間戳作爲版本號,
- # 即使用發佈年份和月份確定發佈的版本號(VERSION和PATCHLEVEL),
- # 額外的字段(SUBLEVEL和EXTRAVERSION)表示候選發佈版或修復bug了的穩定版本
- #
- # 例子:
- # U-Boot v2012.10 - 2012年10月發行版
- # U-Boot v2012.10.1 - 2012年10月穩定發行版1
- # U-Boot v2012.10-rc1 - 2012年10月候選發行版1=
- VERSION = 2012
- PATCHLEVEL = 10
- SUBLEVEL =
- EXTRAVERSION =
- #########################################################################
- # 如果子段SUBLEVEL不爲空,則U_BOOT_VERSION=主版本號.補丁包號.子段+額外版本字段(例如:2012.10.1)
- # 否則U_BOOT_VERSION=主版本號.補丁包號+額外版本字段(例如:2012.10-rc1)
- ifneq "$(SUBLEVEL)" ""
- U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
- else
- U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL)$(EXTRAVERSION)
- endif
- #########################################################################
- # 指定時間信息頭文件 和 版本信息頭文件
- TIMESTAMP_FILE = $(obj)include/generated/timestamp_autogenerated.h
- VERSION_FILE = $(obj)include/generated/version_autogenerated.h
- # HOSTARCH這個變量的賦值,是通過執行一套shell程序來完成的,其中$(shell xxx)的語法就是在shell中執行xxx的命令.
- # 這裏的'|'就是linux中的管道處理符,'\'就是換行的連接符,表示下一行與本行是同行程序處理. uname -m,就是得到
- # machine hardware name,中文翻譯成機器硬件名。
- # sed -e的意思,選項允許在同一行裏執行多條命令,就是表示後面跟的是一串命令腳本,s/abc/def/的命令表達式,
- # 就是表示要從標準輸入中,查找到內容爲abc的,然後替換成def。例如電腦使用Intel Core2系列的CPU,因此"uname –m"
- # 輸出"i686"。 "i686"可以匹配命令"sed -e s/i.86/i386/"中的"i.86",因此在執行Makefile時,HOSTARCH將被設置成"i386" 。
- # 這樣執行這一套程序下來,就知道了機器的硬件體系了。
- HOSTARCH := $(shell uname -m | \
- sed -e s/i.86/x86/ \
- -e s/sun4u/sparc64/ \
- -e s/arm.*/arm/ \
- -e s/sa110/arm/ \
- -e s/ppc64/powerpc/ \
- -e s/ppc/powerpc/ \
- -e s/macppc/powerpc/\
- -e s/sh.*/sh/)
- #########################################################################
- # "uname –s"輸出主機內核名字,本人使用Linux發行版Ubuntu11.10,因此"uname –s"結果是"Linux"。
- # "tr '[:upper:]' '[:lower:]'"作用是將標準輸入中的所有大寫字母轉換爲響應的小寫字母。
- # 因此執行結果是將HOSTOS 設置爲"linux"
- HOSTOS := $(shell uname -s | tr '[:upper:]' '[:lower:]' | \
-
sed -e 's/
cygwin .*/cygwin/') - #########################################################################
- # "$$BASH"的作用實質上是生成了字符串"$BASH"(前一個$號的作用是指明第二個$是普通的字符)。
- # 若執行當前Makefile的shell中定義了"$BASH"環境變量,且文件"$BASH"是可執行文件,則SHELL的值爲"$BASH"。
- # 否則,若"/bin/bash"是可執行文件,則SHELL值爲"/bin/bash"。若以上兩條都不成立,則將"sh"賦值給SHELL變量。
- SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
- else if [ -x /bin/bash ]; then echo /bin/bash; \
- else echo sh; fi; fi)
- #########################################################################
- # export相當於C語言中的extern,把變量輸出到全局,這樣這些變量將設置爲環境變量
- # 注意:export的語意就是將自定義變量轉成環境變量,在系統的任何地方你都可以使用這個變量!
- export HOSTARCH HOSTOS SHELL
- # 定義生產廠家名
- VENDOR=
- #########################################################################
- # 檢查是否禁止在編譯過程中向終端輸出信息,利用findstring函數檢查變量 MAKEFLAGS 是否爲參數's'
- # 當編譯U-boot的時候,我們會輸入make [選項] [目標] ...如果輸入:make -s,則MAKEFLAGS = s
- # XECHO = echo 編譯時將輸出編譯信息,否則則安靜編譯,不用輸出信息
- ifeq (,$(findstring s,$(MAKEFLAGS)))
- XECHO = echo
- else
- XECHO = :
- endif
- #########################################################################
- #
- # 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.
- #
- #########################################################################
- # U-boot支持定義源碼及生成的目標文件存放的目錄的功能。有兩種方法可以實現:
- # 1)指定編譯參數 O=目錄,例如:make O= /tmp/build all
- # 2)設置環境變量BUILD_DIR,該變量指定目錄並設置爲設置爲環境變量
- # 例如:export BUILD_DIR=/tmp/build 然後 make
- # 第二種方法同樣可以用在一個 MAKEALL腳本
- # 例如:export BUILD_DIR=/tmp/build 然後執行之 ./MAKEALL
- # 命令行參數的設置會覆蓋到 BUILD_DIR這一環境變量
- # 如果不指定任何目錄,則編譯生成的目標文件存放在源代碼的頂層目錄下
- #
- # 下面解釋一下幾行腳本,如果參數O不爲空(即使用了O參數),則利用函數origin返回的參數O的來源
- # 函數$( origin, variable) 輸出的結果是一個字符串,輸出結果由變量variable定義的方式決定,
- # 若variable在命令行中定義過,則origin函數返回值爲"command line"。
- # 假若在命令行中執行了“export BUILD_DIR=/tmp/build”的命令,則“$(origin O)”值爲“command line”,
- # 而BUILD_DIR被設置爲“/tmp/build”。
- ifdef O
- ifeq ("$(origin O)", "command line")
- BUILD_DIR := $(O)
- endif
- endif
- #########################################################################
- # 如果BUILD_DIR不爲空,也就是指定了創建目錄,則把路徑保存在saved-output中以備使用
- ifneq ($(BUILD_DIR),)
- saved-output := $(BUILD_DIR)
- #########################################################################
- # 判斷BUILD_DIR變中存放的目錄是否存在,如果不存在則創建目錄
- $(shell [ -d ${BUILD_DIR} ] || mkdir -p ${BUILD_DIR})
- #########################################################################
- # 接下來這一段就是執行cd命令,進入到新建的目錄裏,然後執行pwd命令來得到當前目錄的真實位置。
- # 爲什麼需要這樣做呢,因爲前面的創建目錄工作可能不成功,所以導致後面的cd命令也沒有進去,所以需要後面的pwd命令來確認一下。
- # 接下來的if用了一個三段式的形式,#if(a,b,c)這樣的形式,執行步驟爲,先判斷a的真假,如果爲真,則執行b,如果爲假,則執行c。
- # 所以這裏的意思就是判斷目錄建成沒有建成,如果建成,則什麼也不幹,沒建成,就使用error,輸出錯誤信息且退出。
- BUILD_DIR := $(shell cd $(BUILD_DIR) && /bin/pwd)
- $(if $(BUILD_DIR),,$(error output directory "$(saved-output)" does not exist))
- endif # ifneq ($(BUILD_DIR),)
- #########################################################################
- # 下面是普通的變量賦值,其它目錄變量定義如下,OBJTREE和LNDIR爲存放生成文件的目錄,
- # TOPDIR與SRCTREE爲源碼所在目錄;CURDIR變量指示Make當前的工作目錄,由於當前
- # Make在U-Boot頂層目錄執行Makefile,因此CURDIR此時就是U-Boot頂層目錄。
- # 例如U-boot源碼在"/temp/bootloader/u-boot2012-10"目錄中,則
- # OBJTREE = SRCTREE = TOPDIR = LNDIR = /temp/bootloa
- # 最後設置這些變量設置爲環境變量
- OBJTREE := $(if $(BUILD_DIR),$(BUILD_DIR),$(CURDIR))
- SPLTREE := $(OBJTREE)/spl
- SRCTREE := $(CURDIR)
- TOPDIR := $(SRCTREE)
- LNDIR := $(OBJTREE)
- export TOPDIR SRCTREE OBJTREE SPLTREE
- #########################################################################
- # MKCONFIG指向源碼根目錄下的mkconfig腳本文件,並設置爲設置爲環境變量
- MKCONFIG := $(SRCTREE)/mkconfig
- export MKCONFIG
- #########################################################################
- # 如果存放生成文件的目錄和源碼目錄一致則REMOTE_BUILD = 1,並設置爲設置爲環境變量
- ifneq ($(OBJTREE),$(SRCTREE))
- REMOTE_BUILD := 1
- export REMOTE_BUILD
- endif
- #########################################################################
- # $(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.
- # $(obj)和$(src)在config.mk中有定義,但是在包含config.mk之前主Makefile在執行某些目標
- # 如unconfig, clean, clobber, distclean, etc等的時候同樣需要$(obj)和$(src)
- # 判斷如果OBJTREE和SRCTREE不是同一個目錄,則分別指定各自目錄給obj和src,並設置爲設置爲環境變量
- # obj = 編譯文件的輸出目錄 src = U-boot代碼的頂層目錄,一般我們默認使用U-boot源碼頂層目錄
- # 作爲編譯輸出文件的存放目錄,一般OBJTREE和SRCTREE是相同的路徑,則obj和src爲空
- ifneq ($(OBJTREE),$(SRCTREE))
- obj := $(OBJTREE)/
- src := $(SRCTREE)/
- else
- obj :=
- src :=
- endif
- export obj src
- #########################################################################
- # 把CDPATH變量設爲文件私有,這佯做是爲了防止衝突
- unexport CDPATH
- #########################################################################
- # The "tools" are needed early, so put this first
- # Don't include stuff already done in $(LIBS)
- # The "examples" conditionally depend on U-Boot (say, when USE_PRIVATE_LIBGCC
- # is "yes"), so compile examples after U-Boot is compiled.
- #########################################################################
- # "tool"裏邊的工具是馬上要用到的,所以把它放在首位。不要把已經做好的東西包含在$(LIBS)中,
- # 因爲"examples"裏邊的例子是有條件(即,當USE_PRIVATE_LIBGCC爲yes的時候)的依賴U-boot的,
- # 所以U-Boot編譯完成後再編譯examples
- SUBDIR_TOOLS = tools
- SUBDIR_EXAMPLES = examples/standalone examples/api
- SUBDIRS = $(SUBDIR_TOOLS)
- #########################################################################
- # 其中VERSION_FILE = $(obj)include/generated/version_autogenerated.h
- # TIMESTAMP_FILE = $(obj)include/generated/timestamp_autogenerated.h
- # 即前面定義的版本信息頭文件和時間信息頭文件 .PHONY修飾爲爲目標
- .PHONY : $(SUBDIRS) $(VERSION_FILE) $(TIMESTAMP_FILE)
- #########################################################################
- # 檢查一下include目錄下是否存在config.mk文件,具體解釋如下:wildcard函數是取匹配模式的文件名
- # $(wildcard $(obj)include/config.mk)就會返回符合$(obj)include/config.mk的文件名
- # 如果include下存在config.mk文件,則$(wildcard $(obj)include/config.mk)就會
- # 返回$(obj)include/config.mk,如果不存在config.mk文件,則返回值爲空,如此便完成了檢查
- # include目錄下是否存在config.mk文件。
- # 爲什麼要檢查config.mk存在與否呢?原因是:我們在編譯U-boot前必須配置目標板的信息,也就是要執行
- # make xxx_config,xxx爲目標板的名稱,執行了這一步,會在$(obj)include/中生成一個config.mk
- # 文件,裏邊一般記錄有5個變量信息,這是U-boot必須獲得的信息,沒有它們U-boot就不能編譯,會跳轉到該
- # ifeq的else分支執行,也就是提示錯,else分支在文件尾部。
- # 信息:System not configured - see README
- # make ***[all] error 1
- # 所以如果沒有make xxx_config,直接make是編譯不過去的,通過這樣的判斷U-boot就知道你是否已經做過
- # make xxx_config這一步了。(PS:一句ifeq可謂意味深長,巧妙至極!)
- #
- ifeq ($(obj)include/config.mk,$(wildcard $(obj)include/config.mk))
- #########################################################################
- # 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.
- #########################################################################
- # 在加載config.mk文件之前先加載autoconf.mk,這樣就可以使配置選項對所有頂層編譯文件有效。
- # 我們要需要定義一個all:僞目標來防止autoconf.mk.dep中的依賴目標成爲默認目標
- # 在include目錄下:autoconf.mk文件中是一些和目標板相關的配置,autoconf.mk.dep則爲一些列的
- # .h頭文件的包含
- all:
- sinclude $(obj)include/autoconf.mk.dep
- sinclude $(obj)include/autoconf.mk
- #########################################################################
- # 如果在config.mk中定義了CONFIG_SANDBOX選項,這把SUBDIR_EXAMPLES追加到SUBDIRS中
- # 其中SUBDIR_EXAMPLES = examples/standalone examples/api
- ifndef CONFIG_SANDBOX
- SUBDIRS += $(SUBDIR_EXAMPLES)
- endif
- #########################################################################
- # 加載$(obj)include/config.mk,導出ARCH CPU BOARD VENDOR SOC5個變量
- # ARCH = 目標板的CPU架構 CPU = 具體使用的CPU型號 BOARD = 目標板名稱 SOC = 芯片名稱
- # 例如:對於一個三星S5pv210的板子:ARCH=arm CPU=CortexA8 BOARD=HY210 SOC=S5pv210
- include $(obj)include/config.mk
- export ARCH CPU BOARD VENDOR SOC
- #########################################################################
- # 判斷如果宿主機的架構和目標板的架構是同一種架構,則CROSS_COMPILE爲空,也即採用宿主機默認的交叉編譯鏈
- # 通常我們將目標板使用的交叉工具鏈安裝好以後,在宿主機中設置環境變量,指定開發板使用的交叉編譯鏈
- # 如果不採用設置環境變量的方法,則應該在使用make的時候指定工具鏈,例如:make CROSS_COMPILE=arm-linux-
- ifeq ($(HOSTARCH),$(ARCH))
- CROSS_COMPILE ?=
- endif
- #########################################################################
- # 加載config.mk
- include $(TOPDIR)/config.mk
- #########################################################################
- # If board code explicitly specified LDSCRIPT or CONFIG_SYS_LDSCRIPT, use
- # that (or fail if absent). Otherwise, search for a linker script in a
- # standard location.
- #########################################################################
- # 如果板子代碼明確指定了LDSCRIPT或者CONFIG_SYS_LDSCRIPT,則就使用(或則失敗,如果不存在的話)
- # 否則,在標準的位置中搜索鏈接腳本文件
- LDSCRIPT_MAKEFILE_DIR = $(dir $(LDSCRIPT))
- #########################################################################
- # 這裏LDSCRIPT和CONFIG_SYS_LDSCRIPT均沒有定義,所以下面幾句腳本均沒執行。
- # 注意:如果CONFIG_SYS_LDSCRIPT有定義也是在include/autoconf.mk中定義
- ifndef LDSCRIPT
- #LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug
- ifdef CONFIG_SYS_LDSCRIPT
- # need to strip off double quotes
- LDSCRIPT := $(subst ",,$(CONFIG_SYS_LDSCRIPT))
- endif
- endif
- #########################################################################
- # 如果沒有指定鏈接腳本,接下來會從下面幾個地方搜索:
- ifndef LDSCRIPT
- #########################################################################
- # 如果定義了CONFIG_NAND_U_BOOT,則在$(TOPDIR)/board/$(BOARDDIR)目錄中搜索
- ifeq ($(CONFIG_NAND_U_BOOT),y)
- LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds
- # ifeq ($(wildcard $(LDSCRIPT)),)這句的意思是如果$(TOPDIR)/board/$(BOARDDIR)下
- # 不存在u-boot-nand.lds文件,則轉到$(TOPDIR)/$(CPUDIR)目錄中去搜索u-boot-nand.lds文件
- ifeq ($(wildcard $(LDSCRIPT)),)
- LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot-nand.lds
- endif
- endif
- #########################################################################
- # 如果上面定義了CONFIG_NAND_U_BOOT並且搜索到了u-boot-nand.lds的話,則後面幾個
- # ifeq ($(wildcard $(LDSCRIPT)),)均不執行,如果上面進行過了搜索而仍沒有找到鏈接腳本的話
- # 則繼續在$(TOPDIR)/board/$(BOARDDIR)目錄中搜索u-boot.lds文件(根據運行條件不同名稱稍有不同哦^_^!)
- ifeq ($(wildcard $(LDSCRIPT)),)
- LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds
- endif
- #########################################################################
- # 如果$(TOPDIR)/board/$(BOARDDIR)目錄中沒有u-boot.lds文件則轉到$(TOPDIR)/$(CPUDIR)目錄中去搜索
- ifeq ($(wildcard $(LDSCRIPT)),)
- LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot.lds
- endif
- #########################################################################
- # 如果$(TOPDIR)/$(CPUDIR)目錄中沒有u-boot.lds文件則轉到$(TOPDIR)/arch/$(ARCH)目錄中去搜索
- ifeq ($(wildcard $(LDSCRIPT)),)
- LDSCRIPT := $(TOPDIR)/arch/$(ARCH)/cpu/u-boot.lds
- # We don't expect a Makefile here
- LDSCRIPT_MAKEFILE_DIR =
- endif
- #########################################################################
- # 經過上面的搜索仍沒有找到鏈接腳本文件的話,Makefile就要歇菜不幹活了,直接輸出錯誤信息!
- ifeq ($(wildcard $(LDSCRIPT)),)
- $(error could not find linker script)
- endif
- endif
- #########################################################################
- # 好戲好上演了,從這裏開始,定義編譯的目標對象,start.o是必須放在第一位的,順序很重要
- # 沒事別亂改這些目標對象和庫的順序!
- # 其中CPUDIR=arch/$(ARCH)/cpu/$(CPU),定義在源碼頂層目錄的config.mk中
- OBJS = $(CPUDIR)/start.o
- #########################################################################
- # 我們用的是arm的架構,下面的x86,ppc4xx,mpc85xx的文件均不會被加載進來,略去不管..
- ifeq ($(CPU),x86)
- OBJS += $(CPUDIR)/start16.o
- OBJS += $(CPUDIR)/resetvec.o
- endif
- ifeq ($(CPU),ppc4xx)
- OBJS += $(CPUDIR)/resetvec.o
- endif
- ifeq ($(CPU),mpc85xx)
- OBJS += $(CPUDIR)/resetvec.o
- endif
- # 利用加前綴函數給OBJS中的對象都加上$(obj),即OBJS = $(obj)$(OBJS)
- OBJS := $(addprefix $(obj),$(OBJS))
- # 如果board/$(VENDOR)/common目錄中有Makefile文件,則HAVE_VENDOR_COMMON_LIB爲y否則爲n
- # 這是爲了後面是否能追加入庫所做的標誌
- # 例如:LIBS-y += lib/libgeneric.o,這個時候libgeneric.o纔會被追加到LIBS中!
- # 如果 LIBS-n += lib/libgeneric.o,這個時候libgeneric.o不會被追加到LIBS中!
- HAVE_VENDOR_COMMON_LIB = $(if $(wildcard board/$(VENDOR)/common/Makefile),y,n)
- LIBS-y += lib/libgeneric.o
- LIBS-y += lib/lzma/liblzma.o
- LIBS-y += lib/lzo/liblzo.o
- LIBS-y += lib/zlib/libz.o
- LIBS-$(CONFIG_TIZEN) += lib/tizen/libtizen.o
- LIBS-$(HAVE_VENDOR_COMMON_LIB) += board/$(VENDOR)/common/lib$(VENDOR).o
- LIBS-y += $(CPUDIR)/lib$(CPU).o
- ifdef SOC
- LIBS-y += $(CPUDIR)/$(SOC)/lib$(SOC).o
- endif
- ###################################
- # 如果不是ixp架構的cpu則不會把該對象追加進來
- ifeq ($(CPU),ixp)
- LIBS-y += drivers/net/npe/libnpe.o
- endif
- LIBS-$(CONFIG_OF_EMBED) += dts/libdts.o
- LIBS-y += arch/$(ARCH)/lib/lib$(ARCH).o
- LIBS-y += fs/cramfs/libcramfs.o \
- fs/ext4/libext4fs.o \
- fs/fat/libfat.o \
- fs/fdos/libfdos.o \
- fs/jffs2/libjffs2.o \
- fs/reiserfs/libreiserfs.o \
- fs/ubifs/libubifs.o \
- fs/yaffs2/libyaffs2.o \
- fs/zfs/libzfs.o
- LIBS-y += net/libnet.o
- LIBS-y += disk/libdisk.o
- LIBS-y += drivers/bios_emulator/libatibiosemu.o
- LIBS-y += drivers/block/libblock.o
- LIBS-$(CONFIG_BOOTCOUNT_LIMIT) += drivers/bootcount/libbootcount.o
- LIBS-y += drivers/dma/libdma.o
- LIBS-y += drivers/fpga/libfpga.o
- LIBS-y += drivers/gpio/libgpio.o
- LIBS-y += drivers/hwmon/libhwmon.o
- LIBS-y += drivers/i2c/libi2c.o
- LIBS-y += drivers/input/libinput.o
- LIBS-y += drivers/misc/libmisc.o
- LIBS-y += drivers/mmc/libmmc.o
- LIBS-y += drivers/mtd/libmtd.o
- LIBS-y += drivers/mtd/nand/libnand.o
- LIBS-y += drivers/mtd/onenand/libonenand.o
- LIBS-y += drivers/mtd/ubi/libubi.o
- LIBS-y += drivers/mtd/spi/libspi_flash.o
- LIBS-y += drivers/net/libnet.o
- LIBS-y += drivers/net/phy/libphy.o
- LIBS-y += drivers/pci/libpci.o
- LIBS-y += drivers/pcmcia/libpcmcia.o
- LIBS-y += drivers/power/libpower.o
- LIBS-y += drivers/spi/libspi.o
- LIBS-y += drivers/dfu/libdfu.o
- #########################################################
- # 如果不是mpc83xx,mpc85xx,mpc86xx架構的cpu則不會把下列對象追加進來
- ifeq ($(CPU),mpc83xx)
- LIBS-y += drivers/qe/libqe.o
- LIBS-y += arch/powerpc/cpu/mpc8xxx/ddr/libddr.o
- LIBS-y += arch/powerpc/cpu/mpc8xxx/lib8xxx.o
- endif
- ifeq ($(CPU),mpc85xx)
- LIBS-y += drivers/qe/libqe.o
- LIBS-y += drivers/net/fm/libfm.o
- LIBS-y += arch/powerpc/cpu/mpc8xxx/ddr/libddr.o
- LIBS-y += arch/powerpc/cpu/mpc8xxx/lib8xxx.o
- endif
- ifeq ($(CPU),mpc86xx)
- LIBS-y += arch/powerpc/cpu/mpc8xxx/ddr/libddr.o
- LIBS-y += arch/powerpc/cpu/mpc8xxx/lib8xxx.o
- endif
- LIBS-y += drivers/rtc/librtc.o
- LIBS-y += drivers/serial/libserial.o
- LIBS-$(CONFIG_GENERIC_LPC_TPM) += drivers/tpm/libtpm.o
- LIBS-y += drivers/twserial/libtws.o
- LIBS-y += drivers/usb/eth/libusb_eth.o
- LIBS-y += drivers/usb/gadget/libusb_gadget.o
- LIBS-y += drivers/usb/host/libusb_host.o
- LIBS-y += drivers/usb/musb/libusb_musb.o
- LIBS-y += drivers/usb/phy/libusb_phy.o
- LIBS-y += drivers/usb/ulpi/libusb_ulpi.o
- LIBS-y += drivers/video/libvideo.o
- LIBS-y += drivers/watchdog/libwatchdog.o
- LIBS-y += common/libcommon.o
- LIBS-y += lib/libfdt/libfdt.o
- LIBS-y += api/libapi.o
- LIBS-y += post/libpost.o
- LIBS-y += test/libtest.o
- ###############################################################################
- # 下面這些均是跟硬件架構相關的對象
- ifneq ($(CONFIG_AM33XX)$(CONFIG_OMAP34XX)$(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX),)
- LIBS-y += $(CPUDIR)/omap-common/libomap-common.o
- endif
- ifneq (,$(filter $(SOC), mx25 mx27 mx5 mx6 mx31 mx35))
- LIBS-y += arch/$(ARCH)/imx-common/libimx-common.o
- endif
- ###############################################
- # s5pc1xx系列芯片需要libs5p-common.o
- ifeq ($(SOC),s5pc1xx)
- LIBS-y += $(CPUDIR)/s5p-common/libs5p-common.o
- endif
- ifeq ($(SOC),exynos)
- LIBS-y += $(CPUDIR)/s5p-common/libs5p-common.o
- endif
- ifeq ($(SOC),tegra20)
- LIBS-y += arch/$(ARCH)/cpu/$(SOC)-common/lib$(SOC)-common.o
- endif
- ##################################################
- # 給LIBS中的對象按名稱的首字母進行排序(a-z)按後加上前綴$(obj)
- LIBS := $(addprefix $(obj),$(sort $(LIBS-y)))
- # 聲明爲僞目標
- .PHONY : $(LIBS)
- LIBBOARD = board/$(BOARDDIR)/lib$(BOARD).o
- LIBBOARD := $(addprefix $(obj),$(LIBBOARD))
- # 添加 GCC 庫
- ifdef USE_PRIVATE_LIBGCC
- ifeq ("$(USE_PRIVATE_LIBGCC)", "yes")
- PLATFORM_LIBGCC = $(OBJTREE)/arch/$(ARCH)/lib/libgcc.o
- else
- PLATFORM_LIBGCC = -L $(USE_PRIVATE_LIBGCC) -lgcc
- endif
- else
- PLATFORM_LIBGCC := -L $(shell dirname `$(CC) $(CFLAGS) -print-libgcc-file-name`) -lgcc
- 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.
- #########################################################################
- # 執行鏈接腳本的時候,設置一些用於CPP特殊標誌,這樣才能讓發佈的版本做到向下兼容
- # 如果我們的目標板是smdkc100,則
- # LDPPFLAGS = -include /源碼頂層目錄/include/u-boot/u-boot.lds.h
- # -DCPUDIR = arch/arm/cpu/armv7
- # LD = arm-linux-ld
- LDPPFLAGS += \
- -include $(TOPDIR)/include/u-boot/u-boot.lds.h \
- -DCPUDIR=$(CPUDIR) \
- $(shell $(LD) --version | \
-
sed -ne 's/GNU ld version
[0−9][0−9]∗ \.[0−9][0−9]∗ .*/-DLD_MAJOR=\1 -DLD_MINOR=\2/p') - #########################################################################
- # __OBJS = arch/arm/cpu/armv7/start.o (這是smdkc100的信息,如果換了別的目標板該值會有變動)
- # __LIBS = 按名稱首字母排序(a-z)的各種庫文件和目標對象文件
- __OBJS := $(subst $(obj),,$(OBJS))
- __LIBS := $(subst $(obj),,$(LIBS)) $(subst $(obj),,$(LIBBOARD))
- #########################################################################
- #########################################################################
- # 如果沒有定義則CONFIG_BOARD_SIZE_LIMIT爲空(一般爲空)
- ifneq ($(CONFIG_BOARD_SIZE_LIMIT),)
- BOARD_SIZE_CHECK = \
- @actual=`wc -c $@ | awk '{print $$1}'`; \
- limit=$(CONFIG_BOARD_SIZE_LIMIT); \
-
if test
actual−gt - echo "$@ exceeds file size limit:"; \
- echo " limit: $$limit bytes"; \
- echo " actual: $$actual bytes"; \
- echo " excess: $$((actual - limit)) bytes"; \
- exit 1; \
- fi
- else
- BOARD_SIZE_CHECK =
- endif
- # Always append ALL so that arch config.mk's can add custom ones
- # 始終追加到c中,以便架構配置文件config.mk可以添加自定義項
- c += $(obj)u-boot.srec $(obj)u-boot.bin $(obj)System.map
- ALL-$(CONFIG_NAND_U_BOOT) += $(obj)u-boot-nand.bin
- ALL-$(CONFIG_ONENAND_U_BOOT) += $(obj)u-boot-onenand.bin
- ALL-$(CONFIG_SPL) += $(obj)spl/u-boot-spl.bin
- ALL-$(CONFIG_OF_SEPARATE) += $(obj)u-boot.dtb $(obj)u-boot-dtb.bin
- # 下面tegra20與arm架構無關,不執行
- # enable combined SPL/u-boot/dtb rules for tegra
- ifeq ($(SOC),tegra20)
- ifeq ($(CONFIG_OF_SEPARATE),y)
- ALL-y += $(obj)u-boot-dtb-tegra.bin
- else
- ALL-y += $(obj)u-boot-nodtb-tegra.bin
- endif
- endif
- # 定義all爲目標,生成各種鏡像。
- # 其中u-boot是ELF文件,u-boot.srec是Motorola S-Record format文件,System.map
- # 是U-Boot的符號表,u-boot.bin是最終燒寫到開發板的二進制可執行的文件。
- all: $(ALL-y) $(SUBDIR_EXAMPLES)
- #
- $(obj)u-boot.dtb: $(obj)u-boot
- $(MAKE) -C dts binary
- mv $(obj)dts/dt.dtb $@
- $(obj)u-boot-dtb.bin: $(obj)u-boot.bin $(obj)u-boot.dtb
- cat $^ >$@
- # 生成16進制的鏡像
- $(obj)u-boot.hex: $(obj)u-boot
- $(OBJCOPY) ${OBJCFLAGS} -O ihex $< $@
- $(obj)u-boot.srec: $(obj)u-boot
- $(OBJCOPY) -O srec $< $@
- # arm-linux-objcopy --gap-fill=0xff -O binary u-boot u-boot.bin
- # 編譯命令中的“-O binary”選項指定了輸出的文件爲二進制文件。而“--gap-fill=0xff”
- # 選項指定使用“0xff”填充段與段間的空閒區域。這條編譯命令實現了ELF格式的U-Boot文件到BIN格式的轉換。
- $(obj)u-boot.bin: $(obj)u-boot
- $(OBJCOPY) ${OBJCFLAGS} -O binary $< $@
- $(BOARD_SIZE_CHECK)
- $(obj)u-boot.ldr: $(obj)u-boot
- $(CREATE_LDR_ENV)
- $(LDR) -T $(CONFIG_BFIN_CPU) -c $@ $< $(LDR_FLAGS)
- $(BOARD_SIZE_CHECK)
- $(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
- $(obj)tools/mkimage -A $(ARCH) -T firmware -C none \
- -O u-boot -a $(CONFIG_SYS_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 $(CONFIG_IMX_CONFIG) -T imximage \
- -e $(CONFIG_SYS_TEXT_BASE) -d $< $@
- $(obj)u-boot.kwb: $(obj)u-boot.bin
- $(obj)tools/mkimage -n $(CONFIG_SYS_KWD_CONFIG) -T kwbimage \
- -a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE) -d $< $@
- $(obj)u-boot.pbl: $(obj)u-boot.bin
- $(obj)tools/mkimage -n $(CONFIG_PBLRCW_CONFIG) \
- -R $(CONFIG_PBLPBI_CONFIG) -T pblimage \
- -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 $< > $@
- $(obj)u-boot.ubl: $(obj)spl/u-boot-spl.bin $(obj)u-boot.bin
- $(OBJCOPY) ${OBJCFLAGS} --pad-to=$(PAD_TO) -O binary $(obj)spl/u-boot-spl $(obj)spl/u-boot-spl-pad.bin
- cat $(obj)spl/u-boot-spl-pad.bin $(obj)u-boot.bin > $(obj)u-boot-ubl.bin
- $(obj)tools/mkimage -n $(UBL_CONFIG) -T ublimage \
- -e $(CONFIG_SYS_TEXT_BASE) -d $(obj)u-boot-ubl.bin $(obj)u-boot.ubl
- rm $(obj)u-boot-ubl.bin
- rm $(obj)spl/u-boot-spl-pad.bin
- $(obj)u-boot.ais: $(obj)spl/u-boot-spl.bin $(obj)u-boot.img
- $(obj)tools/mkimage -s -n $(if $(CONFIG_AIS_CONFIG_FILE),$(CONFIG_AIS_CONFIG_FILE),"/dev/null") \
- -T aisimage \
- -e $(CONFIG_SPL_TEXT_BASE) \
- -d $(obj)spl/u-boot-spl.bin \
- $(obj)spl/u-boot-spl.ais
- $(OBJCOPY) ${OBJCFLAGS} -I binary \
- --pad-to=$(CONFIG_SPL_MAX_SIZE) -O binary \
- $(obj)spl/u-boot-spl.ais $(obj)spl/u-boot-spl-pad.ais
- cat $(obj)spl/u-boot-spl-pad.ais $(obj)u-boot.img > \
- $(obj)u-boot.ais
- # Specify the target for use in elftosb call
- ELFTOSB_TARGET-$(CONFIG_MX28) = imx28
- $(obj)u-boot.sb: $(obj)u-boot.bin $(obj)spl/u-boot-spl.bin
- elftosb -zdf $(ELFTOSB_TARGET-y) -c $(TOPDIR)/$(CPUDIR)/$(SOC)/u-boot-$(ELFTOSB_TARGET-y).bd \
- -o $(obj)u-boot.sb
- # On x600 (SPEAr600) U-Boot is appended to U-Boot SPL.
- # Both images are created using mkimage (crc etc), so that the ROM
- # bootloader can check its integrity. Padding needs to be done to the
- # SPL image (with mkimage header) and not the binary. Otherwise the resulting image
- # which is loaded/copied by the ROM bootloader to SRAM doesn't fit.
- # The resulting image containing both U-Boot images is called u-boot.spr
- $(obj)u-boot.spr: $(obj)u-boot.img $(obj)spl/u-boot-spl.bin
- $(obj)tools/mkimage -A $(ARCH) -T firmware -C none \
- -a $(CONFIG_SPL_TEXT_BASE) -e $(CONFIG_SPL_TEXT_BASE) -n XLOADER \
- -d $(obj)spl/u-boot-spl.bin $(obj)spl/u-boot-spl.img
- tr "\000" "\377" < /dev/zero | dd ibs=1 count=$(CONFIG_SPL_PAD_TO) \
- of=$(obj)spl/u-boot-spl-pad.img 2>/dev/null
- dd if=$(obj)spl/u-boot-spl.img of=$(obj)spl/u-boot-spl-pad.img \
- conv=notrunc 2>/dev/null
- cat $(obj)spl/u-boot-spl-pad.img $(obj)u-boot.img > $@
- ifeq ($(SOC),tegra20)
- ifeq ($(CONFIG_OF_SEPARATE),y)
- $(obj)u-boot-dtb-tegra.bin: $(obj)spl/u-boot-spl.bin $(obj)u-boot.bin $(obj)u-boot.dtb
- $(OBJCOPY) ${OBJCFLAGS} --pad-to=$(CONFIG_SYS_TEXT_BASE) -O binary $(obj)spl/u-boot-spl $(obj)spl/u-boot-spl-pad.bin
- cat $(obj)spl/u-boot-spl-pad.bin $(obj)u-boot.bin $(obj)u-boot.dtb > $@
- rm $(obj)spl/u-boot-spl-pad.bin
- else
- $(obj)u-boot-nodtb-tegra.bin: $(obj)spl/u-boot-spl.bin $(obj)u-boot.bin
- $(OBJCOPY) ${OBJCFLAGS} --pad-to=$(CONFIG_SYS_TEXT_BASE) -O binary $(obj)spl/u-boot-spl $(obj)spl/u-boot-spl-pad.bin
- cat $(obj)spl/u-boot-spl-pad.bin $(obj)u-boot.bin > $@
- rm $(obj)spl/u-boot-spl-pad.bin
- endif
- endif
- ifeq ($(CONFIG_SANDBOX),y)
- GEN_UBOOT = \
- cd $(LNDIR) && $(CC) $(SYMS) -T $(obj)u-boot.lds \
- -Wl,--start-group $(__LIBS) -Wl,--end-group \
- $(PLATFORM_LIBS) -Wl,-Map -Wl,u-boot.map -o u-boot
- else
- # 編譯命令GEN_UBOOT,使用以下命令使用$(LDFLAGS)作爲連接腳本,最終生成“u-boot”文件。
- GEN_UBOOT = \
- UNDEF_SYM=`$(OBJDUMP) -x $(LIBBOARD) $(LIBS) | \
- sed -n -e 's/.*$(SYM_PREFIX)__u_boot_cmd_.*/-u\1/p'|sort|uniq`;\
- cd $(LNDIR) && $(LD) $(LDFLAGS) $(LDFLAGS_$(@F)) $$UNDEF_SYM $(__OBJS) \
- --start-group $(__LIBS) --end-group $(PLATFORM_LIBS) \
- -Map u-boot.map -o u-boot
- endif
- $(obj)u-boot: depend \
- $(SUBDIR_TOOLS) $(OBJS) $(LIBBOARD) $(LIBS) $(LDSCRIPT) $(obj)u-boot.lds
- $(GEN_UBOOT)
- ifeq ($(CONFIG_KALLSYMS),y)
- smap=`$(call SYSTEM_MAP,$(obj)u-boot) | \
-
awk '
2 ~ /[tTwW]/ {printf1 $$3 "\\\\000"}'` ; \
- $(CC) $(CFLAGS) -DSYSTEM_MAP="\"$${smap}\"" \
- -c common/system_map.c -o $(obj)common/system_map.o
- $(GEN_UBOOT) $(obj)common/system_map.o
- endif
- $(OBJS): depend
- $(MAKE) -C $(CPUDIR) $(if $(REMOTE_BUILD),$@,$(notdir $@))
- $(LIBS): depend $(SUBDIR_TOOLS)
- $(MAKE) -C $(dir $(subst $(obj),,$@))
- $(LIBBOARD): depend $(LIBS)
- $(MAKE) -C $(dir $(subst $(obj),,$@))
- $(SUBDIRS): depend
- $(MAKE) -C $@ all
- $(SUBDIR_EXAMPLES): $(obj)u-boot
- #########################################################################
- # “$(MAKE) -C $(dir $@) $(notdir $@)”命令經過變量替換後就是
- # “make -C arch/arm/cpu/armv7/u-boot.lds”。也就是轉到
- # arch/arm/cpu/armv7/目錄下,執行“make u-boot.lds”命令。
- $(LDSCRIPT): depend
- $(MAKE) -C $(dir $@) $(notdir $@)
- # 以下執行結果實質上是將arch/arm/cpu/armv7/u-boot.lds經編譯器
- # 簡單預處理後輸出到U-Boot頂層目錄下的u-boot.lds文件。
- $(obj)u-boot.lds: $(LDSCRIPT)
- $(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - <$^ >$@
- nand_spl: $(TIMESTAMP_FILE) $(VERSION_FILE) depend
- $(MAKE) -C nand_spl/board/$(BOARDDIR) all
- # 生成用於nand啓動的二進制鏡像
- $(obj)u-boot-nand.bin: nand_spl $(obj)u-boot.bin
- cat $(obj)nand_spl/u-boot-spl-16k.bin $(obj)u-boot.bin > $(obj)u-boot-nand.bin
- $(obj)spl/u-boot-spl.bin: $(SUBDIR_TOOLS) depend
- $(MAKE) -C spl all
- updater:
- $(MAKE) -C tools/updater all
- #########################################################################
- # Explicitly make _depend in subdirs containing multiple targets to prevent
- # parallel sub-makes creating .depend files simultaneously.
- #
- # 定義依賴目標depend,dep,加載各種文件並進入各種中目錄執行對應的makfile
- # 對於$(SUBDIRS) $(CPUDIR) $(LDSCRIPT_MAKEFILE_DIR)中的每個元素都進入該目錄執行
- # “make _depend”,生成各個子目錄的.depend文件,.depend列出每個目標文件的依賴文件。
- depend dep: $(TIMESTAMP_FILE) $(VERSION_FILE) \
- $(obj)include/autoconf.mk \
- $(obj)include/generated/generic-asm-offsets.h \
- $(obj)include/generated/asm-offsets.h
- for dir in $(SUBDIRS) $(CPUDIR) $(LDSCRIPT_MAKEFILE_DIR) ; do \
- $(MAKE) -C $$dir _depend ; done
- TAG_SUBDIRS = $(SUBDIRS)
- TAG_SUBDIRS += $(dir $(__LIBS))
- TAG_SUBDIRS += include
- FIND := find
- FINDFLAGS := -L
- checkstack:
- $(CROSS_COMPILE)objdump -d $(obj)u-boot \
- `$(FIND) $(obj) -name u-boot-spl -print` | \
- perl $(src)tools/checkstack.pl $(ARCH)
- tags ctags:
- ctags -w -o $(obj)ctags `$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) \
- -name '*.[chS]' -print`
- etags:
- etags -a -o $(obj)etags `$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) \
- -name '*.[chS]' -print`
- cscope:
- $(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) -name '*.[chS]' -print > \
- cscope.files
- cscope -b -q -k
- #########################################################################
- # System.map是U-Boot的符號表,它包含了U-Boot的全局變量和函數的地址信息
- # 也就是將arm-linux-nm命令查看u-boot的輸出信息經過過濾和排序後輸出到System.map
- # System.map表示的是地址標號到該標號表示的地址的一個映射關係。System.map每一行的
- # 格式都是“addr type name”,addr是標號對應的地址值,name是標號名,type表示標號的類型。
- # U-Boot的編譯和運行並不一定要生成System.map,這個文件主要是提供給用戶或外部程序調試時使用的。
- 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
- #########################################################################
- # 檢查gcc版本如果低於 0404則告知該GCC版本無法進行生成工作並說明單板配置成THUMB模式
- checkthumb:
- @if test $(call cc-version) -lt 0404; then \
- echo -n '*** Your GCC does not produce working '; \
- echo 'binaries in THUMB mode.'; \
- echo '*** Your board is configured for THUMB mode.'; \
- false; \
- fi
- #########################################################################
- # 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.
- # 自動生成autoconf.mk文件(所有makefile文件都應該包含該文件),實際上這個目標生成兩個文件
- # autoconf.mk和autoconf.mk.dep。只有頂層的makefile直接包含autoconf.mk.dep文件以
- # 生成autoconf.mk文件。
- $(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 $(CFLAGS) $(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 > [email protected] && \
- mv [email protected] $@
- $(obj)include/generated/generic-asm-offsets.h: $(obj)include/autoconf.mk.dep \
- $(obj)lib/asm-offsets.s
- @$(XECHO) Generating $@
- tools/scripts/make-asm-offsets $(obj)lib/asm-offsets.s $@
- $(obj)lib/asm-offsets.s: $(obj)include/autoconf.mk.dep \
- $(src)lib/asm-offsets.c
- @mkdir -p $(obj)lib
- $(CC) -DDO_DEPS_ONLY \
- $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
- -o $@ $(src)lib/asm-offsets.c -c -S
- $(obj)include/generated/asm-offsets.h: $(obj)include/autoconf.mk.dep \
- $(obj)$(CPUDIR)/$(SOC)/asm-offsets.s
- @$(XECHO) Generating $@
- tools/scripts/make-asm-offsets $(obj)$(CPUDIR)/$(SOC)/asm-offsets.s $@
- $(obj)$(CPUDIR)/$(SOC)/asm-offsets.s: $(obj)include/autoconf.mk.dep
- @mkdir -p $(obj)$(CPUDIR)/$(SOC)
- if [ -f $(src)$(CPUDIR)/$(SOC)/asm-offsets.c ];then \
- $(CC) -DDO_DEPS_ONLY \
- $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
- -o $@ $(src)$(CPUDIR)/$(SOC)/asm-offsets.c -c -S; \
- else \
- touch $@; \
- fi
- #########################################################################
- # ifeq ($(obj)include/config.mk,$(wildcard $(obj)include/config.mk))
- # 下面的else分支和文件前面的上句對應,也就是include目錄下不存在config.mk文件的時候
- # 提示錯誤信息:
- # System not configured - see README
- # make ***[all] error 1
- 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)) \
- updater depend dep tags ctags etags cscope $(obj)System.map:
- @echo "System not configured - see README" >&2
- @ exit 1
- tools: $(VERSION_FILE) $(TIMESTAMP_FILE)
- $(MAKE) -C $@ all
- endif # config.mk
- #########################################################################
- # TIMESTAMP_FILE = $(obj)include/generated/timestamp_autogenerated.h
- # VERSION_FILE = $(obj)include/generated/version_autogenerated.h
- # $(VERSION_FILE):生成版本信息文件version_autogenerated.h
- # $(TIMESTAMP_FILE):生成時間戳信息文件timestamp_autogenerated.h
- $(VERSION_FILE):
- @mkdir -p $(dir $(VERSION_FILE))
- @( localvers='$(shell $(TOPDIR)/tools/setlocalversion $(TOPDIR))' ; \
- printf '#define PLAIN_VERSION "%s%s"\n' \
- "$(U_BOOT_VERSION)" "$${localvers}" ; \
- printf '#define U_BOOT_VERSION "U-Boot %s%s"\n' \
- "$(U_BOOT_VERSION)" "$${localvers}" ; \
- ) > [email protected]
- @( printf '#define CC_VERSION_STRING "%s"\n' \
- '$(shell $(CC) --version | head -n 1)' )>> [email protected]
- @( printf '#define LD_VERSION_STRING "%s"\n' \
- '$(shell $(LD) -v | head -n 1)' )>> [email protected]
- @cmp -s $@ [email protected] && rm -f [email protected] || mv -f [email protected] $@
- $(TIMESTAMP_FILE):
- @mkdir -p $(dir $(TIMESTAMP_FILE))
- @LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"' > [email protected]
- @LC_ALL=C date +'#define U_BOOT_TIME "%T"' >> [email protected]
- @cmp -s $@ [email protected] && rm -f [email protected] || mv -f [email protected] $@
- # 執行該目標時,進入tools目錄編譯easylogo env gdb這些工具
- easylogo env gdb:
- $(MAKE) -C tools/$@ all MTD_VERSION=${MTD_VERSION}
- # gdb工具
- gdbtools: gdb
- # 編譯所有工具
- tools-all: easylogo env gdb $(VERSION_FILE) $(TIMESTAMP_FILE)
- $(MAKE) -C tools HOST_TOOLS_ALL=y
- # 改變LOGO信息
- .PHONY : CHANGELOG
- CHANGELOG:
- git log --no-merges U-Boot-1_1_5.. | \
- unexpand -a | sed -e 's/\s\s*$$//' > $@
- include/license.h: tools/bin2header COPYING
- cat COPYING | gzip -9 -c | ./tools/bin2header license_gzip > include/license.h
- #########################################################################
- # 沒別的,就是刪除生成的各種配置文件
- unconfig:
- @rm -f $(obj)include/config.h $(obj)include/config.mk \
- $(obj)board/*/config.tmp $(obj)board/*/*/config.tmp \
- $(obj)include/autoconf.mk $(obj)include/autoconf.mk.dep
- #########################################################################
- # 當make smdkc100_config的時候,下面的爲目標%_config會被執行,先刪除上次的配置文件
- # 然後@$(MKCONFIG) -A $(@:_config=),@$(MKCONFIG)就是執行mkconfig腳本,傳入的參數
- # 爲 -A和$(@:_config=),就是把@中的"_config"替換爲空$@ = %_config = smdkc100_config
- # $(@:_config=) = smdkc100
- #
-
# awk處理中,(NF &&
1 !~ /^#/),NF表示字段總數不爲零,"&&1 !~ /^#/"表示而且第一個字
-
# 段不是'#'開頭的,總的意思是匹配不以'#'開頭的行。{ print
1":" - # 意思就是打印"$1 : $1_config; $$(MAKE)", $< > $@意思就是把打印的字符串信息寫入到目標
- # $(obj).boards.depend中。
- # (補充知識 $@:表示規則的目標文件名 $<:表示規則的第一個依賴文件名 '>'爲輸出導向符)
- %_config:: unconfig
- @$(MKCONFIG) -A $(@:_config=)
- sinclude $(obj).boards.depend
- $(obj).boards.depend: boards.cfg
-
@awk '(NF &&
1 !~ /^#/) { print1 ": "
1"config; - #########################################################################
- # Functions to generate common board directory names
- # $1爲空,所以lcname和ucname均爲空,sed中-e參數表示直接在命令行上進行sed的操作編輯。
-
# 's/
.∗ _config/\L\1/'意思是搜索匹配xxxxx_config/L1的字符串 -
# 's/
.∗ _config/\U\1/'同理。 -
lcname = $(shell echo $(1) | sed -e 's/
.∗ _config/\L\1/') -
ucname = $(shell echo $(1) | sed -e 's/
.∗ _config/\U\1/') - #========================================================================
- # ARM (SX1不是我們常用的,不執行)
- #========================================================================
- SX1_stdout_serial_config \
- SX1_config: unconfig
- @mkdir -p $(obj)include
- @if [ "$(findstring _stdout_serial_, $@)" ] ; then \
- echo "#undef CONFIG_STDOUT_USBTTY" >> $(obj)include/config.h ; \
- else \
- echo "#define CONFIG_STDOUT_USBTTY" >> $(obj)include/config.h ; \
- fi;
- @$(MKCONFIG) -n $@ SX1 arm arm925t sx1
- #########################################################################
- ## ARM1176 Systems (arm11的架構,我們研究的是CortexA8,這裏也不會執行到)
- #########################################################################
- smdk6400_noUSB_config \
- smdk6400_config : unconfig
- @mkdir -p $(obj)include $(obj)board/samsung/smdk6400
- @mkdir -p $(obj)nand_spl/board/samsung/smdk6400
- @echo "#define CONFIG_NAND_U_BOOT" > $(obj)include/config.h
- @echo "CONFIG_NAND_U_BOOT = y" >> $(obj)include/config.mk
- @if [ -z "$(findstring smdk6400_noUSB_config,$@)" ]; then \
- echo "RAM_TEXT = 0x57e00000" >> $(obj)board/samsung/smdk6400/config.tmp;\
- else \
- echo "RAM_TEXT = 0xc7e00000" >> $(obj)board/samsung/smdk6400/config.tmp;\
- fi
- @$(MKCONFIG) smdk6400 arm arm1176 smdk6400 samsung s3c64xx
- @echo "CONFIG_NAND_U_BOOT = y" >> $(obj)include/config.mk
- #########################################################################
- #########################################################################
- # clean僞目標,刪除編譯生成的文件,但不刪除一些庫文件,避免再次編譯以節省時間
- clean:
- @rm -f $(obj)examples/standalone/82559_eeprom \
- $(obj)examples/standalone/atmel_df_pow2 \
- $(obj)examples/standalone/eepro100_eeprom \
- $(obj)examples/standalone/hello_world \
- $(obj)examples/standalone/interrupt \
- $(obj)examples/standalone/mem_to_mem_idma2intr \
- $(obj)examples/standalone/sched \
- $(obj)examples/standalone/smc911{11,x}_eeprom \
- $(obj)examples/standalone/test_burst \
- $(obj)examples/standalone/timer
- @rm -f $(obj)examples/api/demo{,.bin}
- @rm -f $(obj)tools/bmp_logo $(obj)tools/easylogo/easylogo \
- $(obj)tools/env/{fw_printenv,fw_setenv} \
- $(obj)tools/envcrc \
- $(obj)tools/gdb/{astest,gdbcont,gdbsend} \
- $(obj)tools/gen_eth_addr $(obj)tools/img2srec \
- $(obj)tools/mk{env,}image $(obj)tools/mpc86x_clk \
- $(obj)tools/mk{smdk5250,}spl \
- $(obj)tools/mxsboot \
- $(obj)tools/ncb $(obj)tools/ubsha1
- @rm -f $(obj)board/cray/L1/{bootscript.c,bootscript.image} \
- $(obj)board/matrix_vision/*/bootscript.img \
- $(obj)board/voiceblue/eeprom \
- $(obj)u-boot.lds \
- $(obj)arch/blackfin/cpu/bootrom-asm-offsets.[chs] \
- $(obj)arch/blackfin/cpu/init.{lds,elf}
- @rm -f $(obj)include/bmp_logo.h
- @rm -f $(obj)include/bmp_logo_data.h
- @rm -f $(obj)lib/asm-offsets.s
- @rm -f $(obj)include/generated/asm-offsets.h
- @rm -f $(obj)$(CPUDIR)/$(SOC)/asm-offsets.s
- @rm -f $(TIMESTAMP_FILE) $(VERSION_FILE)
- @find $(OBJTREE) -type f \
- \( -name 'core' -o -name '*.bak' -o -name '*~' -o -name '*.su' \
- -o -name '*.o' -o -name '*.a' -o -name '*.exe' \) -print \
- | xargs rm -f
- # Removes everything not needed for testing u-boot
- # tidy僞目標:刪除所有不需要的測試u-boot的文件
- tidy: clean
- @find $(OBJTREE) -type f \( -name '*.depend*' \) -print | xargs rm -f
- # clobber僞目標:刪除包括鏡像在內的編譯文件
- clobber: tidy
- @find $(OBJTREE) -type f \( -name '*.srec' \
- -o -name '*.bin' -o -name u-boot.img \) \
- -print0 | xargs -0 rm -f
- @rm -f $(OBJS) $(obj)*.bak $(obj)ctags $(obj)etags $(obj)TAGS \
- $(obj)cscope.* $(obj)*.*~
- @rm -f $(obj)u-boot $(obj)u-boot.map $(obj)u-boot.hex $(ALL-y)
- @rm -f $(obj)u-boot.kwb
- @rm -f $(obj)u-boot.pbl
- @rm -f $(obj)u-boot.imx
- @rm -f $(obj)u-boot.ubl
- @rm -f $(obj)u-boot.ais
- @rm -f $(obj)u-boot.dtb
- @rm -f $(obj)u-boot.sb
- @rm -f $(obj)u-boot.spr
- @rm -f $(obj)nand_spl/{u-boot.lds,u-boot-nand_spl.lds,u-boot-spl,u-boot-spl.map,System.map}
- @rm -f $(obj)spl/{u-boot-spl,u-boot-spl.bin,u-boot-spl.lds,u-boot-spl.map}
- @rm -f $(obj)MLO
- @rm -f $(obj)tools/xway-swap-bytes
- @rm -f $(obj)arch/powerpc/cpu/mpc824x/bedbug_603e.c
- @rm -f $(obj)arch/powerpc/cpu/mpc83xx/ddr-gen?.c
- @rm -fr $(obj)include/asm/proc $(obj)include/asm/arch $(obj)include/asm
- @rm -fr $(obj)include/generated
- @[ ! -d $(obj)nand_spl ] || find $(obj)nand_spl -name "*" -type l -print | xargs rm -f
- @rm -f $(obj)dts/*.tmp
- @rm -f $(obj)spl/u-boot-spl{,-pad}.ais
- # distclean僞目標:刪除所有編譯生成的文件和配置文件,這是個常用選項!
- mrproper \
- distclean: clobber unconfig
- ifneq ($(OBJTREE),$(SRCTREE))
- rm -rf $(obj)*
- endif
- # backup:備份,basename命令作用是從文件名中剝離目錄和後綴,TOPDIR是u-boot源碼頂層目錄
- # 這樣剝離了目錄和後綴後,F就是uboot源碼包的名稱。cd ..返回上級目錄,也就是-boot源碼頂層目錄的上一層目錄
- # 對於gtar,我找不到這個命令,搜索了一下也沒發現這是啥,我把它換成tar便可正常備份!!!!!!!!
- # --force-local參數意思是強制使用本地存檔,即使存在克隆。z:表示用gzip對存檔壓縮或者解壓。
- # c:建立新的壓縮文件,v:詳細顯示處理的文件,f:指定文件名,f參數之後一定要立即接文件名,不能
- # 再加別的參數。
- # LC_ALL=C設計本地環境爲C,即POXSI,這麼做是爲了去除所有本地化設置,讓命令能正確執行
- # date:顯示日期的命令,%Y-%m-%d-%T,也就是年月日時分秒了
- # 所以最後得到備份包的名稱是:uboot源碼包的名稱-年-月-日-時分秒.tar.gz
- backup:
- F=`basename $(TOPDIR)` ; cd .. ; \
- tar --force-local -zcvf `LC_ALL=C date "+$$F-%Y-%m-%d-%T.tar.gz"` $$F
-
#gtar --force-local -zcvf `LC_ALL=C date "+
F− - #########################################################################