mini6410 U-boot Makefile 注释

文章由LinuxBoy分享于2019-04-01 05:04:19热评（78）

mini6410 U-boot Makefile 注释

首先来看顶层目录 Makefile 文件

VERSION = 1

PATCHLEVEL = 1

SUBLEVEL = 6

EXTRAVERSION =

U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)

VERSION_FILE = $(obj)include/version_autogenerated.h

#uboot 版本号 1.1.6

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/macppc/ppc/)

#HOSTARCH :=i386

#sed 用法 uname -m 输出 i686 sed 将i686 替换为 i386

HOSTOS := $(shell uname -s | tr '[:upper:]' '[:lower:]' | /

sed -e 's//(cygwin/).*/cygwin/')

# tr '[:upper:]' '[:lower:]' 把大写改为小写即 Linux 改为 linux

#HOSTOS := linux

export HOSTARCH HOSTOS

# HOSTARCH := i386

# HOSTOS := linux

#########################################################################

# 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.

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)

endif

ifneq ($(BUILD_DIR),)

saved-output := $(BUILD_DIR)

#如果BUILD_DIR 不为空

# Attempt to create a output directory.

$(shell [ -d ${BUILD_DIR} ] || mkdir -p ${BUILD_DIR})

# Verify if it was successful.

BUILD_DIR := $(shell cd $(BUILD_DIR) && /bin/pwd)

$(if $(BUILD_DIR),,$(error output directory "$(saved-output)" does not exist))

endif # ifneq ($(BUILD_DIR),)

# BUILD_DIR 是否存在

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)

TOPDIR := $(SRCTREE)

LNDIR := $(OBJTREE)

export TOPDIR SRCTREE OBJTREE

MKCONFIG := $(SRCTREE)/mkconfig

export MKCONFIG

#MKCONFIG ：= mkconfig

#****这个脚本文件很重要

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

#########################################################################

ifeq ($(OBJTREE)/include/config.mk,$(wildcard $(OBJTREE)/include/config.mk))

# load ARCH, BOARD, and CPU configuration

include $(OBJTREE)/include/config.mk

export ARCH CPU BOARD VENDOR SOC

#/include/config.mk 内容在make *_config 时产生

# 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

#ARCH = arm

#CPU = s3c64xx

#BOARD = mini6410

#VENDOR = samsung

#SOC = s3c6410

ifeq ($(ARCH),arm)

CROSS_COMPILE = arm-linux-

endif

CROSS_COMPILE = arm-linux-

export CROSS_COMPILE

#指定交叉编译工具前缀

# load other configuration

include $(TOPDIR)/config.mk

****重要的配置脚本总结：
     $(SRCTREE)/mkconfig
    $(TOPDIR)/config.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

OBJS := $(addprefix $(obj),$(OBJS))

#addprefix加前缀函数

LIBS = lib_generic/libgeneric.a

LIBS += board/$(BOARDDIR)/lib$(BOARD).a

LIBS += cpu/$(CPU)/lib$(CPU).a

ifdef SOC

LIBS += cpu/$(CPU)/$(SOC)/lib$(SOC).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

LIBS += net/libnet.a

LIBS += disk/libdisk.a

LIBS += rtc/librtc.a

LIBS += dtt/libdtt.a

LIBS += drivers/libdrivers.a

LIBS += drivers/nand/libnand.a

LIBS += drivers/nand_legacy/libnand_legacy.a

# add to support onenand. by scsuh

LIBS += drivers/onenand/libonenand.a

LIBS += drivers/sk98lin/libsk98lin.a

LIBS += post/libpost.a post/cpu/libcpu.a

LIBS += common/libcommon.a

LIBS += $(BOARDLIBS)

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。

.PHONY : $(LIBS)

****声明伪目标，在后面的编译中用

# Add GCC lib

PLATFORM_LIBS += -L $(shell dirname `$(CC) $(CFLAGS) -print-libgcc-file-name`) -lgcc

#dirname 去掉最后一层目录

#CC = $(CROSS_COMPILE)gcc = arm-linux-gcc

CFLAGS 编译选项，也是在顶层目录的config.mk中定义

# The "tools" are needed early, so put this first

# Don't include stuff already done in $(LIBS)

SUBDIRS = tools /

examples /

post /

post/cpu

.PHONY : $(SUBDIRS)

#伪目标SUBDIRS: 执行tools ,examples ,post,post/cpu 子目录下面的make文件

ifeq ($(CONFIG_NAND_U_BOOT),y)

NAND_SPL = nand_spl

U_BOOT_NAND = $(obj)u-boot-nand.bin

endif

__OBJS := $(subst $(obj),,$(OBJS))

#去掉前缀，__OBJS=cpu/arm920t/start.o

__LIBS := $(subst $(obj),,$(LIBS))

#去掉前缀，__LIBS=$(LIBS)+$(LIBBOARD)

#########################################################################

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

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4部分组成。那么接下去就分别对这4部分进行递归的处理。

$(obj)u-boot.hex: $(obj)u-boot

$(OBJCOPY) ${OBJCFLAGS} -O ihex $< $@

#arm-linux-objcopy被用来复制一个目标文件的内容到另一个文件中,

#可用于不同源文件的之间的格式转换

#OBJCOPY = $(CROSS_COMPILE)objcopy

$(obj)u-boot.srec: $(obj)u-boot

$(OBJCOPY) ${OBJCFLAGS} -O srec $< $@

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

$(OBJCOPY) ${OBJCFLAGS} -O binary $< $@

$(OBJDUMP) -d $< > $<.dis

（1）目标文件u-boot.bin依赖于 $(obj)u-boot目标；

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

（1.1.1）depend：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。

depend dep:

for dir in $(SUBDIRS) ; do $(MAKE) -C $$dir _depend ; done

（1.1.2）$(SUBDIRS)；执行操作为：对各个子目录执行makefile文件。

$(SUBDIRS):

$(MAKE) -C $@ all

(1.1.3) $(OBJS);执行：

$(MAKE) -C cpu/$(CPU) $(if $(REMOTE_BUILD),$@,$(notdir $@))

如果cpu为arm920t，编译文件cpu/arm920t。

(1.1.4) $(LIBS) ;依赖$(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

$(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.dis: $(obj)u-boot

$(OBJDUMP) -d $< > $@

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

UNDEF_SYM=`$(OBJDUMP) -x $(LIBS) |sed -n -e 's/.*/(__u_boot_cmd_.*/)/-u/1/p'|sort|uniq`;/

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

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

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

#LNDIR := $(OBJTREE)

#LD = $(CROSS_COMPILE)ld

$(OBJS):

$(MAKE) -C cpu/$(CPU) $(if $(REMOTE_BUILD),$@,$(notdir $@))

$(LIBS):

$(MAKE) -C $(dir $(subst $(obj),,$@))

$(SUBDIRS):

$(MAKE) -C $@ all

$(NAND_SPL): version

$(MAKE) -C nand_spl/board/$(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

version:

@echo -n "#define U_BOOT_VERSION /"U-Boot " > $(VERSION_FILE); /

echo -n "$(U_BOOT_VERSION)" >> $(VERSION_FILE); /

echo -n $(shell $(CONFIG_SHELL) $(TOPDIR)/tools/setlocalversion /

$(TOPDIR)) >> $(VERSION_FILE); /

echo "/"" >> $(VERSION_FILE)

gdbtools:

$(MAKE) -C tools/gdb all || exit 1

updater:

$(MAKE) -C tools/updater all || exit 1

env:

$(MAKE) -C tools/env all || exit 1

depend dep:

for dir in $(SUBDIRS) ; do $(MAKE) -C $$dir _depend ; done

tags ctags:

ctags -w -o $(OBJTREE)/ctags `find $(SUBDIRS) include /

lib_generic board/$(BOARDDIR) cpu/$(CPU) lib_$(ARCH) /

fs/cramfs fs/fat fs/fdos fs/jffs2 /

net disk rtc dtt drivers drivers/sk98lin common /

/( -name CVS -prune /) -o /( -name '*.[ch]' -print /)`

etags:

etags -a -o $(OBJTREE)/etags `find $(SUBDIRS) include /

lib_generic board/$(BOARDDIR) cpu/$(CPU) lib_$(ARCH) /

fs/cramfs fs/fat fs/fdos fs/jffs2 /

net disk rtc dtt drivers drivers/sk98lin common /

/( -name CVS -prune /) -o /( -name '*.[ch]' -print /)`

$(obj)System.map: $(obj)u-boot

@$(NM) $< | /

grep -v '/(compiled/)/|/(/.o$$/)/|/( [aUw] /)/|/(/./.ng$$/)/|/(LASH[RL]DI/)' | /

sort > $(obj)System.map

#########################################################################

else

all $(obj)u-boot.hex $(obj)u-boot.srec $(obj)u-boot.bin /

$(obj)u-boot.img $(obj)u-boot.dis $(obj)u-boot /

$(SUBDIRS) version gdbtools updater env depend /

dep tags ctags etags $(obj)System.map:

@echo "System not configured - see README" >&2

@ exit 1

endif

.PHONY : CHANGELOG

CHANGELOG:

git log --no-merges U-Boot-1_1_5.. | /

unexpand -a | sed -e 's//s/s*$$//' > $@

#########################################################################

unconfig:

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

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

#========================================================================

mini6410_nand_config-ram128 : unconfig

@$(MKCONFIG) mini6410 arm s3c64xx mini6410 samsung s3c6410 NAND ram128

unconfig:

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

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

MKCONFIG := $(SRCTREE)/mkconfig

在执行make之前，我们先执行了make *_config

例如我们执行 mini6410_nand_config-ram128 配置mini6410开发板实际执行：

@$(MKCONFIG) mini6410 arm s3c64xx mini6410 samsung s3c6410 NAND ram128

$(MKCONFIG) 实际就是uboot顶层目录下的 mkconfig脚本文件，内容如下所示：

#!/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]

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 8 ] && exit 1

echo "Configuring for ${BOARD_NAME} board which boot from $7 $8..."

# 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 //建立从asm-arm 到 asm的链接

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

@$(MKCONFIG)

$1、mini6410 $2、arm $3、s3c64xx $4、mini6410 $5、samsung $6、s3c6410 $7、NAND $8、ram128

# create link for s3c64xx SoC

if [ "$3" = "s3c64xx" ] ; then

rm -f regs.h

ln -s $6.h regs.h

rm -f asm-$2/arch

ln -s arch-$3 asm-$2/arch

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

rm -f asm-$2/proc

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

# 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

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

case $7 in

SD)

echo "#define FRIENDLYARM_BOOT_MEDIA_SD" >> config.h

;;

NAND)

echo "#define FRIENDLYARM_BOOT_MEDIA_NAND" >> config.h

;;

esac

case $8 in

ram128)

echo "#define FRIENDLYARM_BOOT_RAM128" >> config.h

;;

ram256)

echo "#define FRIENDLYARM_BOOT_RAM256" >> config.h

;;

esac

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

exit 0

下面分析 config.mk 这个文件的作用等于 kernel 中的 .config ？

# 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 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

#########################################################################

ifneq ($(OBJTREE),$(SRCTREE))

ifeq ($(CURDIR),$(SRCTREE))

dir :=

else

dir := $(subst $(SRCTREE)/,,$(CURDIR))

endif

obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)

src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)

$(shell mkdir -p $(obj))

else

obj :=

src :=

endif

# clean the slate ...

PLATFORM_RELFLAGS =

PLATFORM_CPPFLAGS =

PLATFORM_LDFLAGS =

# When cross-compiling on NetBSD, we have to define __PPC__ or else we

# will pick up a va_list declaration that is incompatible with the

# actual argument lists emitted by the compiler.

# [Tested on NetBSD/i386 1.5 + cross-powerpc-netbsd-1.3]

ifdef ARCH

sinclude $(TOPDIR)/$(ARCH)_config.mk # include architecture dependend rules

endif

ifdef CPU

sinclude $(TOPDIR)/cpu/$(CPU)/config.mk # include CPU specific rules

endif

ifdef SOC

sinclude $(TOPDIR)/cpu/$(CPU)/$(SOC)/config.mk # include SoC specific rules

endif

ifdef VENDOR

BOARDDIR = $(VENDOR)/$(BOARD)

else

BOARDDIR = $(BOARD)

endif

ifdef BOARD

sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules

endif

#config.mk 内容

#ifndef TEXT_BASE

#TEXT_BASE = 0xc7e00000

#endif

#########################################################################

CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; /

else if [ -x /bin/bash ]; then echo /bin/bash; /

else echo sh; fi ; fi)

ifeq ($(HOSTOS)-$(HOSTARCH),darwin-ppc)

HOSTCC = cc

else

HOSTCC = gcc

endif

HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer

HOSTSTRIP = strip

#########################################################################

# Option checker (courtesy linux kernel) to ensure

# only supported compiler options are used

cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null /

> /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)

# Include the make variables (CC, etc...)

AS = $(CROSS_COMPILE)as

LD = $(CROSS_COMPILE)ld

CC = $(CROSS_COMPILE)gcc

CPP = $(CC) -E

AR = $(CROSS_COMPILE)ar

NM = $(CROSS_COMPILE)nm

STRIP = $(CROSS_COMPILE)strip

OBJCOPY = $(CROSS_COMPILE)objcopy

OBJDUMP = $(CROSS_COMPILE)objdump

RANLIB = $(CROSS_COMPILE)RANLIB

＠定义AR选项ARFLAGS，调试选项DBGFLAGS，优化选项OPTFLAGS
　预处理选项CPPFLAGS，C编译器选项CFLAGS，连接选项LDFLAGS

ifneq (,$(findstring s,$(MAKEFLAGS)))

ARFLAGS = cr

else

ARFLAGS = crv

endif

RELFLAGS= $(PLATFORM_RELFLAGS)

DBGFLAGS= -g # -DDEBUG

OPTFLAGS= -Os #-fomit-frame-pointer

ifndef LDSCRIPT

#LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug

ifeq ($(CONFIG_NAND_U_BOOT),y)

LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds

else

LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds

endif

OBJCFLAGS += --gap-fill=0xff

gccincdir := $(shell $(CC) -print-file-name=include)

CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) /

-D__KERNEL__ -DTEXT_BASE=$(TEXT_BASE) /

ifneq ($(OBJTREE),$(SRCTREE))

CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include

endif

CPPFLAGS += -I$(TOPDIR)/include

CPPFLAGS += -fno-builtin -ffreestanding -nostdinc /

-isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)

ifdef BUILD_TAG

CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes /

-DBUILD_TAG='"$(BUILD_TAG)"'

else

CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes

endif

# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>

# option to the assembler.

AFLAGS_DEBUG :=

AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)

LDFLAGS += -Bstatic -T $(LDSCRIPT) -Ttext $(TEXT_BASE) $(PLATFORM_LDFLAGS)

# Location of a usable BFD library, where we define "usable" as

# "built for ${HOST}, supports ${TARGET}". Sensible values are

# - When cross-compiling: the root of the cross-environment

# - Linux/ppc (native): /usr

# - NetBSD/ppc (native): you lose ... (must extract these from the

# binutils build directory, plus the native and U-Boot include

# files don't like each other)

# So far, this is used only by tools/gdb/Makefile.

ifeq ($(HOSTOS)-$(HOSTARCH),darwin-ppc)

BFD_ROOT_DIR = /usr/local/tools

else

ifeq ($(HOSTARCH),$(ARCH))

# native

BFD_ROOT_DIR = /usr

else

#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386

#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386

BFD_ROOT_DIR = /opt/powerpc

endif

ifeq ($(PCI_CLOCK),PCI_66M)

CFLAGS := $(CFLAGS) -DPCI_66M

endif

#########################################################################

export CONFIG_SHELL HPATH HOSTCC HOSTCFLAGS CROSS_COMPILE /

AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP /

MAKE

export TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS

#########################################################################

ifndef REMOTE_BUILD

%.s: %.S

$(CPP) $(AFLAGS) -o $@ $<

%.o: %.S

$(CC) $(AFLAGS) -c -o $@ $<

%.o: %.c

$(CC) $(CFLAGS) -c -o $@ $<

else

$(obj)%.s: %.S

$(CPP) $(AFLAGS) -o $@ $<

$(obj)%.o: %.S

$(CC) $(AFLAGS) -c -o $@ $<

$(obj)%.o: %.c

$(CC) $(CFLAGS) -c -o $@ $<

endif

#########################################################################

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mini6410 U-boot Makefile 注释