Makefile阅读

root@Ubuntu:/usr/src/linux-headers-2.6.32-26/arch/arm/boot# cat Makefile## arch/arm/boot/Makefile## This file is included by the global makefile so that you can add your own# architecture-specific flags and dependencies.## This file is subject to the terms and conditions of the GNU General Public# License. See the file "COPYING" in the main directory of this archive# for more details.## Copyright （C） 1995-2002 Russell King#MKIMAGE := $（srctree）/scripts/mkuboot.shifneq （$（MACHINE）,）include $（srctree）/$（MACHINE）/Makefile.bootendif# Note: the following conditions must always be true:# ZRELADDR == virt_to_phys（PAGE_OFFSET + TEXT_OFFSET）# PARAMS_PHYS must be within 4MB of ZRELADDR# INITRD_PHYS must be in RAMZRELADDR := $（zreladdr-y）PARAMS_PHYS := $（params_phys-y）INITRD_PHYS := $（initrd_phys-y）export ZRELADDR INITRD_PHYS PARAMS_PHYStargets := Image zImage xipImage bootpImage uImage #规则的目标，好几个啊。ifeq （$（CONFIG_XIP_KERNEL）,y）$（obj）/xipImage: vmlinux FORCE$（call if_changed,objcopy）@echo " Kernel: $@ is ready （physical address: $（CONFIG_XIP_PHYS_ADDR））"$（obj）/Image $（obj）/zImage: FORCE@echo "Kernel configured for XIP （CONFIG_XIP_KERNEL=y）"@echo "Only the xipImage target is available in this case"@falseelse$（obj）/xipImage: FORCE@echo "Kernel not configured for XIP （CONFIG_XIP_KERNEL！=y）"@false$（obj）/Image: vmlinux FORCE$（call if_changed,objcopy）@echo " Kernel: $@ is ready"$（obj）/compressed/vmlinux: $（obj）/Image FORCE$（Q）$（MAKE） $（build）=$（obj）/compressed $@$（obj）/zImage: $（obj）/compressed/vmlinux FORCE$（call if_changed,objcopy）@echo " Kernel: $@ is ready"endifquiet_cmd_uimage = UIMAGE $@ cmd_uimage = $（CONFIG_SHELL） $（MKIMAGE） -A arm -O linux -T kernel -C none -a $（LOADADDR） -e $（STARTADDR） -n "Linux-$（KERNELRELEASE）" -d $< $@ifeq （$（CONFIG_ZBOOT_ROM）,y）$（obj）/uImage: LOADADDR=$（CONFIG_ZBOOT_ROM_TEXT）else$（obj）/uImage: LOADADDR=$（ZRELADDR）endififeq （$（CONFIG_THUMB2_KERNEL）,y）# Set bit 0 to 1 so that "mov pc, rx" switches to Thumb-2 mode$（obj）/uImage: STARTADDR=$（shell echo $（LOADADDR） | sed -e "s/.$$/1/"）else$（obj）/uImage: STARTADDR=$（LOADADDR）endif$（obj）/uImage: $（obj）/zImage FORCE$（call if_changed,uimage）@echo " Image $@ is ready"$（obj）/bootp/bootp: $（obj）/zImage initrd FORCE$（Q）$（MAKE） $（build）=$（obj）/bootp $@@:$（obj）/bootpImage: $（obj）/bootp/bootp FORCE$（call if_changed,objcopy）@echo " Kernel: $@ is ready"PHONY += initrd FORCEinitrd:@test "$（INITRD_PHYS）" ！= "" || （echo This machine does not support INITRD; exit -1）@test "$（INITRD）" ！= "" || （echo You must specify INITRD; exit -1）install: $（obj）/Image$（CONFIG_SHELL） $（srctree）/$（src）/install.sh $（KERNELRELEASE） $（obj）/Image System.map "$（INSTALL_PATH）"zinstall: $（obj）/zImage$（CONFIG_SHELL） $（srctree）/$（src）/install.sh $（KERNELRELEASE） $（obj）/zImage System.map "$（INSTALL_PATH）"zi:$（CONFIG_SHELL） $（srctree）/$（src）/install.sh $（KERNELRELEASE） $（obj）/zImage System.map "$（INSTALL_PATH）"i:$（CONFIG_SHELL） $（srctree）/$（src）/install.sh $（KERNELRELEASE） $（obj）/Image System.map "$（INSTALL_PATH）"subdir- := bootp compressed