u-boot移植手册-hanson

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1、u-boot移植手册-Hansonsourceinsighterror:unabletowritetotempfileforsavingoperation:修改内核与uboot中指定的MACH_TYPE:Kernel:include/asm-arm/mach-types.h#defineMACH_TYPE_SMDK2440A782Uboot:include/asm-arm/mach-types.h#defineMACH_TYPE_SMDK2440A782修改uboot的board/smdk2440a/smdk2440a.cgd->b

2、d->bi_arch_number=MACH_TYPE_SMDK2440A;启动过程：/u-boot.1.1.6/cpu/arm920t/start.S/u-boot.1.1.6/board/smdk2440a/lowlevel_init.S/u-boot.1.1.6/lib_arm/board.c----start_armboot()第二阶段C语言入口－/board/smdk2440a/smdk2440a.c--board_init()板级初始化MPLL机器类型ID等－/cpu/arm920t/s3c24x0/serial.c--serial_ini

3、t()串口初始化函数－/board/smdk2440a/smdk2440a.c--dram_init()检测系统的内存映射/u-boot.1.1.6/common/main.c-main_loop()为内核设置启动参数lib_arm/armlinux.c定义增加两个配置项标记就可以了：include/configs/smdk2440a.h/*fortag(s)totransfermessagetokernel*/#defineCONFIG_SETUP_MEMORY_TAGS1#defineCONFIG_CMDLINE_TAG1内核的启动：lib_arm

4、/armlinux.c-do_bootm_linux函数来启动内核theKernel(0,bd->bi_arch_number,bd->bi_boot_params);bd->bi_arch_number就是前面board_init设置的机器类型IDbd->bi_boot_params就是标记列表的开始地址移植步骤：（1）修改u-boot-1.1.6/Makefile添加：smdk2440a_config:unconfig@$(MKCONFIG)$(@:_config=)armarm920tsmdk2440aNULLs3c24x0（2）在board目录

5、下新建smdk2440a文件夹，即为BSP包可以直接拷贝board/QQ2440为board/smdk2440a（3）修改board/smdk2440a/Makefile，如下将COBJS:=smdk2440a.oflash.oboot_init.o中的flash.o去掉，即：COBJS:=smdk2440a.oboot_init.o（4）将board/smdk2440a/下的QQ2440.c改名为smdk2440a.c（5）拷贝include/configs/QQ2440.h并取名为include/configs/smdk2440a.h（6）修改bo

6、ard/smdk2440a/lowlevel_init.S//#defineB3_BWSCON(DW16+WAIT+UBLB)#defineB3_BWSCON(DW16)#defineB4_BWSCON(DW16+WAIT+UBLB)//HansonchangeforMini2440（7）修改board/smdk2440a/u-boot.ldsSECTIONS{.=0x00000000;.=ALIGN(4);.text:{cpu/arm920t/start.o(.text)board/smdk2440a/boot_init.o(.text)*(.tex

7、t)}（8）修改board/smdk2440a/smdk2440a.cDECLARE_GLOBAL_DATA_PTR;//增加宏，使得能够访问全局变量gb//时钟频率设置#defineS3C2440_MPLL_400MHZ0x7f021//((0x5c<<12)

8、(0x01<<4)

9、(0x01))#defineS3C2440_MPLL_200MHZ((0x5c<<12)

10、(0x01<<4)

11、(0x02))#defineS3C2440_MPLL_100MHZ((0x5c<<12)

12、(0x01<<4)

13、(0x03))#defineS3C2440_UPLL_

14、48MHZ((0x38<<12)

15、(0x02<<4)

16、(0x02))#defineS3C244