Linux3.6.7中Make uImage的load address 和 Entry Point相同的问题

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本文转自：http://blog.chinaunix.net/uid-28382924-id-3421282.html

从u-boot-2012.10那里拷贝个mkimage工具放在/usr/bin目录下，在make uImage时发现load address和entry point都是0x50008000.结果u-boot在bootm命令后一直停在starting kernel......

手工改entry point=0x50008040就可以启动了。那么，怎样让make uImage自动把entry point设置为50008040呢？网上有资料说arch/arm/boot/里面的Makefile文件中：

把
$(obj)/uImage: STARTADDR=$(LOADADDR)
改为
$(obj)/uImage: STARTADDR=$(shell echo $(LOADADDR) | sed -e "s/..$$/40/")
其中，sed -e "s/..$$/40/"的意思是，把输出的字符串的最后两个字符删掉，并且用40来补充，也可以理解为，把字符串最后两个字符用40来替换。

通过对比3.0.1版本和3.6.7版本发现前者有这样的内容，但后者的make file却找不到

STARTADDR这变量。找了半天才发现，linux3.6.7版本中设置mkimage传递的参数不是放在arch/arm/boot目录的makefile中，而是放在scripts目录下的makefile.lib文件中，内容如下：

# U-Boot mkimage
# ---------------------------------------------------------------------------

MKIMAGE := $(srctree)/scripts/mkuboot.sh

# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
# the number of overrides in arch makefiles
UIMAGE_ARCH ?= $(SRCARCH)
UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
UIMAGE_OPTS-y ?=
UIMAGE_TYPE ?= kernel
UIMAGE_LOADADDR ?= arch_must_set_this
#UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)##这是原来的配置
UIMAGE_ENTRYADDR =$(shell echo $(UIMAGE_LOADADDR) | sed -e "s/..$$/40/")##这是我修改后的配置
UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
UIMAGE_IN ?= $<
UIMAGE_OUT ?= $@

quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
-T $(UIMAGE_TYPE) \
-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
-n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)

通过上面修改后，make uImage如下：

root@ubuntu:/home/my/linux-3.6.7# make uImage
CHK     include/linux/version.h
CHK     include/generated/utsrelease.h
make[1]: “include/generated/mach-types.h”是最新的。
CALL    scripts/checksyscalls.sh
CHK     include/generated/compile.h
Kernel: arch/arm/boot/Image is ready
Kernel: arch/arm/boot/zImage is ready
UIMAGE arch/arm/boot/uImage
Image Name:   Linux-3.6.7
Created:      Mon Nov 26 12:37:17 2012
Image Type:   ARM Linux Kernel Image (uncompressed)
Data Size:    1476744 Bytes = 1442.13 kB = 1.41 MB
Load Address: 50008000
Entry Point: 50008040
Image arch/arm/boot/uImage is ready
root@ubuntu:/home/my/linux-3.6.7#

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