Arm Linux 內(nèi)核生成過程

arm-linux-gnu-ld -EL -p --no-undefined -X -o vmlinux -T arch/arm/kernel/vmlinux.lds

arch/arm/kernel/head.o
arch/arm/kernel/init_task.o
init/built-in.o
--start-group
usr/built-in.o
arch/arm/kernel/built-in.o
arch/arm/mm/built-in.o
arch/arm/common/built-in.o
arch/arm/mach-s3c2410/built-in.o
arch/arm/nwfpe/built-in.o
kernel/built-in.o
mm/built-in.o
fs/built-in.o
ipc/built-in.o
security/built-in.o
crypto/built-in.o
lib/lib.a
arch/arm/lib/lib.a
lib/built-in.o
arch/arm/lib/built-in.o
drivers/built-in.o
sound/built-in.o
net/built-in.o
--end-group .tmp_kallsyms2.o

2. 將上面的vmlinux去除調試信息、注釋、符號表等內(nèi)容，生成arch/arm/boot/Image，這是不帶多余信息的linux內(nèi)核，Image的大小約3.2MB；
命令:arm-linux-gnu-objcopy -O binary -R .note -R .comment -S vmlinux arch/arm/boot/Image

3. 將 arch/arm/boot/Image 用gzip -9 壓縮生成arch/arm/boot/compressed/piggy.gz大小約1.5MB；
命令:gzip -f -9 < arch/arm/boot/compressed/../Image > arch/arm/boot/compressed/piggy.gz

4. 編譯arch/arm/boot/compressed/piggy.S 生成arch/arm/boot/compressed/piggy.o大小約1.5MB，這里實際上是將piggy.gz通過piggy.S編譯進piggy.o文件中。而piggy.S文件僅有6行，只是包含了文件piggy.gz;
命令:arm-linux-gnu-gcc -Wp,-MD,arch/arm/boot/compressed/.piggy.o.d -nostdinc -isystem /home/justin/crosstool/gcc-3.4.5-glibc-2.3.6/arm-linux-gnu/lib/gcc/arm-linux-gnu/3.4.5/include -D__KERNEL__ -Iinclude -mlittle-endian -D__ASSEMBLY__ -Wa,-L -gdwarf-2 -mapcs-32 -mno-thumb-interwork -D__LINUX_ARM_ARCH__=4 -march=armv4 -mtune=arm9tdmi -msoft-float -c -o arch/arm/boot/compressed/piggy.o arch/arm/boot/compressed/piggy.S

5. 依據(jù)arch/arm/boot/compressed/vmlinux.lds 將arch/arm/boot/compressed/目錄下的文件head.o 、piggy.o 、misc.o鏈接生成 arch/arm/boot/compressed/vmlinux，這個vmlinux是經(jīng)過壓縮且含有自解壓代碼的內(nèi)核,大小約1.5MB;
命令:arm-linux-gnu-ld -EL --defsym zreladdr=0x30008000 --defsym params_phys=0x30000100 -p --no-undefined -X /home/justin/crosstool/gcc-3.4.5-glibc-2.3.6/arm-linux-gnu/lib/gcc/arm-linux-gnu/3.4.5/libgcc.a -T arch/arm/boot/compressed/vmlinux.lds arch/arm/boot/compressed/head.o arch/arm/boot/compressed/piggy.o arch/arm/boot/compressed/misc.o -o arch/arm/boot/compressed/vmlinux

6. 將arch/arm/boot/compressed/vmlinux去除調試信息、注釋、符號表等內(nèi)容，生成arch/arm/boot/zImage大小約1.5MB;這已經(jīng)是一個可以使用的linux內(nèi)核映像文件了；
命令:arm-linux-gnu-objcopy -O binary -R .note -R .comment -S arch/arm/boot/compressed/vmlinux arch/arm/boot/zImage

7. 將arch/arm/boot/zImage添加64Bytes的相關信息打包為arch/arm/boot/uImage大小約1.5MB;
命令:/bin/sh /home/farsight/Resources/kernel/linux-2.6.14/scripts/mkuboot.sh -A arm -O linux -T kernel -C none -a 0x30008000 -e 0x30008000 -n Linux-2.6.14 -d arch/arm/boot/zImage arch/arm/boot/uImage