從u-boot-2012.10那裏拷貝個mkimage工具放在/usr/bin目錄下，在make uImage時發現load address 和entry point都是0x50008000.結果u-boot在bootm命令後一直停在starting kernel......
手工改entry point=0x50008040就可以啓動了。那麼，怎樣讓make uImage自動把entry point設置爲50008040呢？網上有資料說arch/arm/boot/裏面的Makefile文件中：
把
$(obj)/uImage: STARTADDR=$(LOADADDR)
改爲
$(obj)/uImage: STARTADDR=$(shell echo $(LOADADDR) | sed -e "s/..$$/40/")
其中，sed -e "s/..$$/40/"的意思是，把輸出的字符串的最後兩個字符刪掉，並且用40來補充，也可以理解爲，把字符串最後兩個字符用40來替換。
通過對比3.0.1版本和3.6.7版本發現前者有這樣的內容，但後者的make file卻找不到
STARTADDR這變量。找了半天才發現，linux3.6.7版本中設置mkimage傳遞的參數不是放在arch/arm/boot目錄的makefile中，而是放在scripts目錄下的makefile.lib文件中，內容如下：
# 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 ?= $(UIMAGE_LOADADDR)##這是原來的配置
UIMAGE_ENTRYADDR =$(shell echo $(UIMAGE_LOADADDR) | sed -e "s/..$$/40/")##這是我修改後的配置
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)
通過上面修改後，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#
