Arm Linux kernel build process

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. Remove debugging information, comments, symbol table and other contents from the vmlinux above to generate arch/arm/boot/Image, which is the Linux kernel without redundant information. The size of the Image is about 3.2MB; 
command: arm-linux-gnu-objcopy -O binary -R .note -R .comment -S vmlinux arch/arm/boot/Image 

3. Compress arch/arm/boot/Image with gzip -9 to generate arch/arm/boot/compressed/piggy.gz with a size of about 1.5MB; 
command: gzip -f -9 < arch/arm/boot/compressed/../Image > arch/arm/boot/compressed/piggy.gz 

4. Compile arch/arm/boot/compressed/piggy.S to generate arch/arm/boot/compressed/piggy.o with a size of about 1.5MB. Here, piggy.gz is actually compiled into the piggy.o file through piggy.S. The piggy.S file has only 6 lines, which just includes the file piggy.gz; 
command: arm-linux-gnu-gcc -Wp,-MD,arch/arm/boot/compressed/.piggy.od -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. According to arch/arm/boot/compressed/vmlinux.lds, link the files head.o, piggy.o and misc.o in the arch/arm/boot/compressed/directory to generate arch/arm/boot/compressed/vmlinux. This vmlinux is a compressed kernel with self-extracting code, with a size of about 1.5MB; 
command: 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. Remove debugging information, comments, symbol tables, etc. from arch/arm/boot/compressed/vmlinux to generate arch/arm/boot/zImage with a size of about 1.5MB; this is already a usable Linux kernel image file; 
command: arm-linux-gnu-objcopy -O binary -R .note -R .comment -S arch/arm/boot/compressed/vmlinux arch/arm/boot/zImage 

7. Add 64Bytes of related information to arch/arm/boot/zImage and package it into arch/arm/boot/uImage with a size of about 1.5MB; 
command: /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