...........
MKCONFIG    := $(SRCTREE)/mkconfig
........
smdk2410_config    :    unconfig
    @$(MKCONFIG) $(@:_config=) arm arm920t smdk2410 samsung s3c24x0

./mkconfig smdk2410 arm arm920t smdk2410 NULL s3c24x0

# 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"

if [ "$SRCTREE" != "$OBJTREE" ] ; then //判斷原始碼目錄和目標檔案目錄是否是一樣
    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 //刪除asm-$2/arch目錄，即asm-arm/arch

if [ -z "$6" -o "$6" = "NULL" ] ; then //$6="s3c24x0"不為空，也不為NULL，執行else分支

    ln -s ${LNPREFIX}arch-$3 asm-$2/arch //LNPREFIX 為空，這個命令實際上等同於"ln - s arch-s3c24x0 asm-arm/arch"

else
    ln -s ${LNPREFIX}arch-$6 asm-$2/arch
fi

if [ "$2" = "arm" ] ; then //重新建立/asm-arm/proc檔案，並讓它連結向proc-armv目錄 

    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

ARCH = arm
CPU = arm920t
BOARD = smdk2410
SOC　=s3c24x0

#
# 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
echo "#include <asm/config.h>" >>config.h

exit 0

# load ARCH, BOARD, and CPU configuration
include $(obj)include/config.mk
export    ARCH CPU BOARD VENDOR SOC

# set default to nothing for native builds
ifeq ($(HOSTARCH),$(ARCH))
CROSS_COMPILE ?=
endif

# load other configuration
include $(TOPDIR)/config.mk

./mkconfig smdk2410 arm arm920t smdk2410 NULL s3c24x0

fdef    VENDOR
BOARDDIR = $(VENDOR)/$(BOARD)
else
BOARDDIR = $(BOARD)
endif
ifdef    BOARD
sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk    # include board specific rules
endif

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

LDFLAGS += -Bstatic -T $(obj)u-boot.lds $(PLATFORM_LDFLAGS)
ifneq ($(TEXT_BASE),)
LDFLAGS += -Ttext $(TEXT_BASE)
endif

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

$(OBJS):    depend
        $(MAKE) -C cpu/$(CPU) $(if $(REMOTE_BUILD),$@,$(notdir [email protected]))

$(LIBS):    depend $(SUBDIRS)
        $(MAKE) -C $(dir $(subst $(obj),,$@))

$(obj)u-boot.srec:    $(obj)u-boot
        $(OBJCOPY) -O srec $< [email protected]

$(obj)u-boot.bin:    $(obj)u-boot
        $(OBJCOPY) ${OBJCFLAGS} -O binary $< [email protected]

$(obj)u-boot.ldr:    $(obj)u-boot
        $(obj)tools/envcrc --binary > $(obj)env-ldr.o
        $(LDR) -T $(CONFIG_BFIN_CPU) -c [email protected] $< $(LDR_FLAGS)

$(obj)u-boot.ldr.hex:    $(obj)u-boot.ldr
        $(OBJCOPY) ${OBJCFLAGS} -O ihex $< [email protected] -I binary

$(obj)u-boot.ldr.srec:    $(obj)u-boot.ldr
        $(OBJCOPY) ${OBJCFLAGS} -O srec $< [email protected] -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 $< [email protected]
................

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) $$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
        $(GEN_UBOOT)

UTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
OUTPUT_ARCH(arm)
ENTRY(_start)
SECTIONS
{
    . = 0x00000000;

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

    . = ALIGN(4);
    .rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.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 (NOLOAD) : { *(.bss) . = ALIGN(4); }
    _end = .;
}