嵌入式BootLoader移植实验三

合肥学院嵌入式系统设计实验报告（2013-2014第二学期）专业：实验项目：实验三BootLoader移植实验实验时间：2014年5月7实验成员：指导老师：干开峰电子信息与电气工程系

2014年4月制一、实验目的1、熟悉Bootloader工作原理。2、了解U-Boot的代码结构。3、掌握U-Boot移植过程。二、实验内容本实验熟悉Bootloader工作原理，了解U-Boot源码结构，基于S3C2440处理器，完成U-Boot移植，并在目标开发板上测试通过。三、移植环境u-boot版本：u-boot-2011-03Linux平台：Fedora14交叉编译工具：arm-linux-gcc-4.3.3arm开发板：micro2440CPU：S3C2440SDRAM：64M1NorFlash：2MNandFlash：256M网卡：DM9000EP四、实验过程1、建立Micro2440配置（1）按下图所示命令解压u-boot-2011.03-micro2440.tar压缩包root用ubuntu：~#mkdir/home/ubootmot用ubuntu：~#cd/home/ubootroot^ubuntu:/home/uboot#tarjxvfu-boot-2011.03-micro2440.tar（2）输入命令：geditboards.cfg打开boards.cfg文件。root@ubuntucd/home/uboot/u-boot-2011.S3rootfaubuntu：/home/iiboot/u-boot-2011.03#geditboards.cfg在boards.cfg中添加一行：micro2440armarm920t-Samsungs3c24x0语句。_boards.cfgX#micro2440armarm920t-Samsungs3c24xS#Listofboards|（3）创建板级支持文件输入命令：cp-rboard/samsung/smdk2410board/samsung/micro2440cdboard/samsung/micro2440/mvsmdk2410.cmicro2440.cgeditMakefile□ot（jduDuntu：/noine/uDoot/ii-Doot-2tiii.tu/Doara/samsung/micro244a#caDoara/samsumicro244S/ash:cd:board/samsung/micro2440/:Nosuchfileordirectoryoot母ubuntu:/home/uboot/u-boot-2911.03/board/samsung/micro244S#geditMakefile将COBJS:=smdk2410.oflash.o改为COBJS:=micro2440.oflash.oCOBJS:=micro244B.oflash.onandread.oSOBJS:=lowlevelinit.oI-输入命令：cd../../..cpinclude/configs/smdk2410.hinclude/configs/micro2440.hgeditinclude/configs/micro2440.hroot@ubuntu:/honie/uboot/u-boot-2011.03/board/samsung/micro2440#cd../■■/--root@ubuntu:/home/uboot/u-boot-2011.B3#cpinclude/configs/smdk2410.hinclude/configs/micro244S.hroot@ubuntu:/home/uboot/u-boot-2011.03#geditinclude/configs/miicro2440.h修改内容一：#defineCONFIG_SYS_PROMPT"[Micro2440]#"/*MonitorCommandPrompt*/修改内容二：#defineCONFIG_SYS_SDRAM_BASEPHYS_SDRAM_1#defineCONFIG_SYS_INIT_SP_ADDR(CONFIG_SYS_SDRAM_BASE+0x1000-GENERATED_GBL_DATA_SIZE)If^defineCONFIGSYSSDRAHBASEP'HYS_SDRAM_1^defineCONFIG[SYS[lNIT_§P_ADDR(CONFIGSYSSDRAMBASE+SxlQSSGENERATEDGBLDATASIZE}*micro2440.hX#defineCONFIGKGDBSERINDEX1/♦whichserialporttouse♦/#endif/*♦Miscellaneousconfigurableoptions*/#defineCONFIG_SYSSDRAMBASEPHYSSDRAM1#defineCONFIG^SYS^INITSPADDR(CONFIGSYSSDRAMBASE+6x1000GENERATEDGBLDATASIZE)#defineC0NFIG]sys]L0NGHelp一一/*undeftosavememory♦/#defineCONFIG]SYS]PROMPTM[^1icro2440]#"/♦MonitorCommandPrompt♦/#defineCONFIG]SYS]CBSIZE256/♦ConsoleI/OBufferSize♦/#defineCONFIG]SYS[PBSIZE(CONFIGSYSCBSIZE+sizeof(CONFIGSYSPROMPT)+16)/*PrintBufferSize*/#defineCONFIGSYSMAXARGS16/♦maxnumberofcommandargs♦/#defineCONFIG]SYS[BARGSIZECONFIGSYSCBSIZE/♦BootArgumentBufferSize*/#defineCONFIGSYSMEMTESTSTART0x30000600/♦memtestworkson♦/#defineCONFIG]SYS[MEMTEST[END0X33FO0O00/*63MBinDRAM♦/#defineCONFIGSYSLOADADDR0x33000000/♦defaultloadaddress♦/测试编译环境输入命令：makemicro2440_config出现：Configuringformicro2440board...输入命令：makeGeneratinginclude/autoconf.mkGeneratinginclude/autoconf.mk.deparm-linux-objcopy-Osrecu-bootu-boot.srecarm-linux-objcopy--gap-fill=0xff-Obinaryu-bootu-boot.bin

.3/armv4t-Igcc-Mapu-boot.map-ou-bootarm-linux-objcopy-0srecu-bootu-boot.srecarm-linux-objcopy--gap-fill=0xff-0binaryu-bootu-boot.binrootfaubuntui/home/uboot/u-boot-2011.03#|、在RAM中运行(1)在根目录下进入include/configs文件夹输入命令：geditmicro2440.h，打开micro2440.h文件。「oot@ubuntu：~#cd/home/uboot/u-boot-2011.03/include/configsroot（aubuntu:/home/uboot/u-boot-2011.03/include/configs#geditmicro2440.h（2）在micro2440.h中删除：#defineCONFIG_S3C24101/*specificallyaSAMSUNGS3C2410SoC*/#defineCONFIG_SMDK24101/*onaSAMSUNGSMDK2410Board*/添加：#defineCONFIG_S3C24401/*specificallyaSAMSUNGS3C2440SoC*/#defineCONFIG_MICRO2440#defineCONFIG_SKIP_LOWLEVEL_INIT#ifndef_CONIFIG_H#define二CONFIG]H#defineCOMFIGS3C24401/*specificallyaSAMSUNGS3C2446SoC*/#defineC0NIFIg2mICR0244S^defineCOMFIG^SKIPLOWLEVELIHIT]/*在根目录下进入arch/arm/cpu/arm920t文件夹输入命令:geditstart.Sroot^ubuntu：/home/uboot/u-boot-2011.03#cdarchroot@ubuntu：/home/uboot/u-boot-2011.03/arch#cdarm/cpu/arm920troot@ubuntu：/home/uboot/u-boot-2011.03/arch/arm/cpu/arm920t#geditstartsroot@ubuntu:/home/uboot/u-boot-2011.03/arch/arm/cpu/ann920t#geditstart.S按下图所示进行修改部分内容:###deTine###deTineLOCKTIMEdefineMPLLCONdefineUPLLCON0X4C0000000X4C0000040X4C000008defineCLKDIVVAL5defineMMDIV-0x7fdefineM>DIV2defineM^SDIV1defineU^MDIV0x38defineu]PDIV2defineU^SDIV2tdrrl,=0x7fffIdrr0r=INTSUBMSKstrrlf[rQ]Idrr0,=LOCKTIMEEeOAULTIME^iMLTIME♦/tdrrl,=0x0fff0fffstrrlp[r0]start.SX/»XTal=12.0MHzMPLL=405MHz*//*XTal=12.0MHzUPLL=48MHz*/在根目录board/samsung/micro2440下中输入geditmicro2440.c命令ntroot@ubuntu:/home/uboot/u-boot-2011.03/board/samsung/micro2440#geditmlcro244€.ntcpci.oanvers/pcmcia/Liopcmcia.□anvers/power/Liopower.oanversdrivers/serial/libserial.odrivers/spi/libspi.odrivers/twserial/libtws.odrivers/usb/eth/libusb_eth.adrivers/usb/gadget/libusbgadget.odrivers/usb/host/libusbhost.odrivers/usb/musb/libusbmusb.□drivers/usb/phy/libusbphy.□drivers/video/libvideo.□drivers/watchdog/libwatchdog.ofs/cramfs/libcramfs.ofs/ext2/libext2fs.ofs/fat/libfat.ofs/fdos/libfdos.ofs/jffs2/libjffs2.ofs/reiserfs/libreiserfs.ofs/ubifs/libubifs.ofs/yaffs2/libyaffs2.olib/libfdt/libfdt.olib/libgeneric.□lib/lzma/liblzma.olib/lzo/liblzo.□net/libnet.opost/libpost.oboard/samsung/nicro2440/1ibmicra244e.o--end-group/home/uboot/u-boot-2011.B3/arch/arm/lib/eabi_compat.o-L/usr/local/ar[n/4.3.3/bin/../^ib/gcc/anr-none-linux-gnueabi/4.3.3/armv+t-Igcc-Mapu-boot.map-ou-bootam-linux-objcopy-0srecu-bootu-boot.srecam-linux-objcopy--gap-fill=Sxff-0binaryu-bootu-boot.binmot足ubuntu:/home/uboot/u-boot-2011.03#|测试在根目录下输入命令：make编译完成后将u-boot.bin下载到SDRAM的0x33f80000地址处，u-boot已经能在RAM中运行。Downloadedfileat0x30000000,size=124385bytes+Boot2011.CJ3(May13201^一20:57:25}DRAM:EMiBaail：512KiBNANE:NAND_ECC_NCNEselectedbyJo□己rddriver.Thisisnotreconmeaded!!256MiB-***Warning-badCRCfusingdefaultenvironnientIn:aerialOut:serialErr:serialNet:dm9000Hitaoykeytostopautoboot:0dm9000i/o:0z20000300rid:0x90000a^6HM9000:runaingin16bitmodeMAC:08:00:3e:2€:Oa.:5boperatingatuaknown:0modeUaingdm9000deviceTFTPfromaerver192..1.210;ourIPaddreaaia30Filename'uimage-nf3.img'.Loadaddress:0X31000000Loading:TT|3、支持DM900在根目录下打开include/configs文件夹，执行geditmicro2440.h命令root@ubuntu:/home/uboot/u-boot-2811.83/include/configsgeditmicm?446.h删除：#defineCONFIG_CS8900/*wehaveaCS8900on-board*/#defineCONFIG_NETMASK#defineCONFIG_IPADDR10

#defineCONFIG_SERVERIP添加：#defineCONFIG_CMD_NET#defineCONFIG_DRIVER_DM90001#defineCONFIG_DM9000_NO_SROM1#defineCONFIG_DM9000_BASE0x20000300#defineDM9000_IOCONFIG_DM9000_BASE#defineDM9000_DATA(CONFIG_DM9000_BASE+4)#defineCONFIG_CMD_PING#defineCONFIG_ETHADDR08:00:3e:26:0a:5b#defineCONFIG_NETMASK#defineCONFIG_IPADDR26//开发板MAC地址//开发板IP地址//主机IP地址#ifndef_CONFIG_H#define二//开发板MAC地址//开发板IP地址//主机IP地址#ifndef_CONFIG_H#define二CONFIG[h#defineCONFIG_S3C24401#defineC0NFIGJIICR0244Q#defineCONFIG^SKIPLOWLEVELINIT#defineCONFljG^MDNzT/*specificallyaSAMSUNGS3C2440SoC#define#define#define#define#define#define#define#define#define#defineCONFIGCONFIGCONFIGDM900QDM900SCONFIGCONFIGCONFIGCONFIGCONFIG110X20000300DRIVERDM9000DM9Q00"NOSROH□M9000-BASE10CONFIG_DM9000BASEDATA(CONFIGDM900QBASE+4)CMDPINGETHADDRNETflASKIPADDRSERVERIP08:00:3e:26:0a:5b192.1&8.1S.12&24开发椒IIAC地HI〃开发板IP地HI〃正机IPWil在根目录下进入board/samsung/micro2440文件夹执行geditmicro2440.c命令intboard_eth_init(bdt^bis)(intrc-0；#ifdefCONFIG_CS890arc=€s8900_initia!ize(OrCONFIG_CS8900_BASE);#endif#ifdefCONFIG_DRIVER_DM9000rc=dm9000_initialize(bis)；#endif|returnrc；}#endif在根目录下进入arch/arm/lib文件夹执行gediteabi_compat.c命令^ootfaubuntu:/home/uboot/u-boot-2811.03/arch/arm/lib#gedi:eabicompat.c

#ifndefCONFIG__HICRO2440lotraise(intsignum)printft11raise：Signal#cdught\n"rsignum)；#endifreturn9;#ifndefCONFIG__HICRO2440在根目录下进入drivers/net文件夹执行geditdm9000x.c命令root(aubuntu:/home/uboot/u-boot-2011.03/drivers/net#geditdmgsOQx.c在修改staticintdm9000_init(structeth_device*dev,bd_t*bd)函数中内容，如下图所示：Istaticvoiddm9^QGhalt(structeth_device*netdev)□M900e_DBGf"%.s\nn,_func_);#ifndefCONFIG-MICRO2440/*RESETdevie*/phy_writet0,0x8000);/*PHYRESET*/DM9000_iow(DFI9000_GPRr0x01);尸Power-DownPHY*/DM90003iow(DM90002lMRr0x80);尸Disableallin坨门DMgeOQ^iowtDMgOSO^CR,0x00);/*DisableRX*/#endif|测试在根目录下输入命令：make编译完成后将u-boot.bin下载到SDRAM的0x33f80000地址处，u-boot已经能在RAM中运行。测试结果如下图所示：Downloadedfileat0x30000000,size=127340bytesBoot2011.03(May13201^-21:53:1^)DRAM:64MiB己mh:512K1BNAND:NANE_ECC_N0NE：selectedbyboazddriver.Tillsisnotreconuuended!!256M1B""***LfaTDing-badCRCfusingdefaultenvironmentIn:aerialCut:aerialErr:aerialNet:dia900OHitanykeytostopautoboot:0dm9000!/□:05:20000300,id:0x900Gaa4€DM9000:runningin16bitmodeMAC:08:00:3e:26:Qfl:5boperatingatunkriowTi:0modeUsingdm9OO0deviceTFTPfromserver10;ourIPaddressia30Filename1uiniage-nf3.img*.Loadaddress:0x31000000Loading:TT

4、支持内核启动（1）在根目录下进入include/configs文件夹执行geditmicro2440.h命令「Ettgubuntu:，ho"e/ub8t/u-b8t-2Gll.臼gedit用ic「口244添加:#defineCONFIG_SETUP_MEMORY_TAGS1//如果没有定义这个参数，则uboot参数必须加入men=内存大小11〃设置11〃设置bootargs出入内械必须

nnoinitrdroot=/dev/mtdblock3init=/l#defineCONFIG^CHDLINETAG^defineCONFIG^BOOTARGS（2）在根目录下进入arch/arm/lib文件夹执行geditbootm.c命令root(aubuntu:/home/uboot/u-boot-2Sll.S3/arch/arm/lib#geditbootm.c在staticvoidannounce_and_cleanup(void)函数中添加：#ifndefCONFIG_MICRO2440cleanup_before_linux();#endifstaticvoidannou-Ke_and_cleanup(void){""printf("\nStartingkernel...\n\n"l;#ifdefCONFIGUSBDEVICE{''externvoidudcdisconnect(void]:tidedisconnect(J；}"#endif#ifndefCONFIG_MICRO2440cleanupbefore_linux();#endif}自动启动内核如果要自动启动内核，需要include/conskfigs/micro2440.h定义CONFIG_BOOTCOMMAND，类似如下内容：#defineCONFIG_BOOTCOMMAND"nandread0x300080000x600000x300000;bootm0x30008000"#defineCONFIGBOOTCOMMANDunandread0x30008330OxGflflflO0x300000;boot#ifdefined(CONFIG_CMD_KGDB)（4）测试在根目录下输入命令：make编译完成后将u-boot.bin下载到SDRAM的0x33f80000地址处，u-boot已经能在RAM中运行。测试结果如下图所示：EownloadedfileatOx30000OOOrsize=127800bytesSoot2011.03(May13201^一22:10:19)DRAM:石司MiBash:512KiBNANE:NANE_ECC_N0NEselectedbyboarddriver.Thisisnotreconmieiided!!256MiB一一***Kaming一badCRCfusingdefaulteavizonraent二n:serialCat:serialErr:serialNet:dni9000Hitanykeytoatopautoboot:05、支持NandFlash添加s3c2440_nand.c文件在根目录下输入touchdrivers/mtd/nand/s3c2440_nand.c指令进行文件的创建，在根目录下输入geditdrivers/mtd/nand/s3c2440_nand.c命令打开文件。但ubuntu:/home/uboot/u-boot-2011.03/drivers/mtd/nand#gedits3c2440_nand.在DEBUGN(〃board_nand_init()/n〃)；下面修改如图所示的三句内容：DEBUGN("board_nand_initn\n11);//twrphO=1；//twrphl=1；//taels=0；taels-1;twrphQ=2;twrphl=1；在根目录下进入drivers/mtd/nand文件夹中执行geditMakefile命令ubuntu:/home/uboot/u-boot-2eil.03/drivers/mtd/nand#geditMakefile添加：#COBJS-$(CONFIG_NAND_S3C2440)+=s3c2440_nand.o如下图所示：C0BJS-$(C0NFIG2mAND2S3C244B)+=S3c2446_nand.0在根目录下进入include/conskfigs文件夹打开micro2440.h文件添加：#defineCONFIG_MTD_DEVICE#defineCONFIG_NAND_S3C2440#defineCONFIG_CMD_NAND#ifdefined(CONFIG_CMD_NAND)#defineCONFIG_SYS_NAND_BASE0x4E000000//Nand配置寄存器基地址#defineCONFIG_SYS_MAX_NAND_DEVICE1

#defineCONFIG_MTD_NAND_VERIFY_WRITE1#endif#defineCONFIG_ENV_IS_IN_NAND1#defineCONFIG_ENV_OFFSET0x40000//将环境变量保存到nand中的0x40000位置#defineCONFIG_ENV_SIZE0x10000/*TotalSizeofEnvironmentSector*/#defineCONFIGMTDDEVICE^defineCONFIGjNAND53C2440#defineCDNFTGCMDNAND#ifdefined(CDNFIG^CHDNAND)0X4E0000Q0//Nand配置寄存器底地址11#defineCONFIGSYSNANDBASE#defineCONFIG'^YS^MAXNAND_DEVICE#defineCQNFIG-MTDNANDVERIFYWRITE#endif#defineCONFIGENV_I5INNAND1#defineCONFIG'EMV~0FF5ET0x40000〃将环境斐.将保事利nand中的0X4000G#defineCONFIGENV~SIZEOxlOSOO/*Total0X4E0000Q0//Nand配置寄存器底地址11测试在根目录下输入命令：make编译完成后将u-boot.bin下载到SDRAM的0x33f80000地址处，u-boot已经能在RAM中运行。测试结果如下图所示：6、支持yaffs下载在根目录下进入include/conskfigs文件夹执行geditmicro2440.h命令root@ubuntu:/home/uboot/u-boot-2011.03/include/confiqs#qeditmicro2440.h添加：#defineCONFIG_CMD_NAND_YAFFSI#deflneCONFIG_CMDNAND_YAFFS在根目录下进入drivers/mtd/nand文件夹打开nand_util.c文件修改部分内容：if(!need_skip&&!withoob){}ops.mode=MTD_OOB_RAWrval=nand->write_oob(nand,offset,&ops);if(rval)break;ops.Ten=pagesize；□ps.ooblen=nand->oobsize；ops.mode=hfTDOOBRAW;ops.ooboffs=0;pages=write_size/pagesizeoob；for(0；page<pages；page++){

ops.datbuf=pbuffer;ops.oobbuf=ops.datbuf+pagesize;rval=nand->write_oob(nand,offsetr&ops)；if(rval)break；下载yaffs镜像下载yaffs镜像的时候要注意分区的第一块不能写，比如友善之臂的默认分区如下:Numberofpartitions:4nameoffsetsizeflagvivi0x000000000x000400000param0x000400000x000200000kernel0x000600000x005000000root0x005600000x3fa800000也就是说yaffs镜像所在分区的起始地址在0x560000，因此使用nandwrite.yaffs命令下载yaffs时要写的地址为0x560000+0x20000(NandFlash每块的大小)=0x580000，即下载命令类似如下：tftp0x30008000uImagenandwrite.yaffs0x300080000x5800000x3000007、支持NandFlash启动创建nand_read.c在根目录下执行touchboard/samsung/micro2440/nand_read.c命令，在根目录下执行geditboard/samsung/micro2440/nand_read.c命令，将下列内容复制到nand_read.c文件中#definerNFCONF(^(volatileunsigned*)0x4E000000)#definerNFCONT(^(volatileunsigned*)0x4E000004)#definerNFCMD(^(volatileunsigned*)0x4E000008)#definerNFADDR(^(volatileunsigned*)0x4E00000C)#definerNFDATA8(^(volatileunsignedchar*)0x4E000010)#definerNFSTAT(*(volatileunsigned*)0x4E000020)#defineCMD_READ10x00/*页读命令周期1*/#defineCMD_READ20x30/*页读命令周期2*/#defineCMD_RESET0xFF/*复位*/#defineNF_CMD(cmd){rNFCMD=(cmd);}/*写命令*/#defineNF_ADDR(addr){rNFADDR=(addr);}/*写地址*/#defineNF_RDDATA8()(rNFDATA8)/*读8位数据*/#defineNF_nFCE_L(){rNFCONT&=~(1<<1);}/*片选使能*/#define#define#define#define#define#define#defineNF_nFCE_H()NF_WAITRB()NF_CLEAR_RB()NF_DETECT_RB()TACLSTWRPH0TWRPH1121i){rNFCONT|=(1<<1);}/*片选禁用*/{while(!(rNFSTAT&(1<<1)));}/*等待就绪*/{rNFSTAT|=(1<<2);}/*清除就绪/忙位*/{while(!(rNFSTAT&(1<<2)));}/*等待就绪*/voiddelay(int{while(i—>0);}voidNand_Init(void){rNFCONF=(TACLS<<12)|(TWRPH0<<8)|(TWRPH1<<4)|(0<<0);rNFCONT=(1<<4)|(1<<1)|(1<<0);}staticvoidNand_Reset(void){NF_nFCE_L();NF_CLEAR_RB();NF_CMD(CMD_RESET);NF_DETECT_RB();NF_nFCE_H();}unsignedcharNand_ReadPage(constint{/*片选使能*//*清除就绪/忙位/*写复位命令/*等待就绪*//*片选禁用*/*/*/page,unsignedchar*constbuffer)inti;Nand_Reset();NF_nFCE_L();NF_CLEAR_RB();NF_CMD(CMD_READ1);NF_ADDR(0x0);NF_ADDR(0x0);NF_ADDR(page&0xff);NF_ADDR((page>>8)&0xff);NF_ADDR((page>>16)&0xff);NF_CMD(CMD_READ2);NF_DETECT_RB();for(i=0;i<2048;i++){buffer[i]=NF_RDDATA8();}NF_nFCE_H();}intnand_read(intstart_page,intread_pages,unsignedchar*buffer){inti;Nand_Init();for(i=0;i<read_pages;i++){Nand_ReadPage(start_page,buffer+2048*i);start_page++;}return0;}*nand_read.cXNF_DETECT_RB();for(i=O；i<2048；i++){buffer[i]=NFRDDATA8();}NFnFCEH();}intnandread(intstartpage,intreadpages,unsignedchar*buffer){inti;NandInit();for(i=0；i<read_pages;i++){NandReadPage(startpage,buffer+2948*1);start_page++;}|return0;在根目录下进入board/samsung/micro2440文件夹执行geditMakefile命令root@ubuntu:/home/uboot/u-boot-2011.e3/board/samsung/micro2440#geditMakefile修改COBJS:=micro2440.oflash.onand_read.oCOBJS:=micro2440.oflash.onand_read.o在根目录下执行geditarch/arm/cpu/arm920t/u-boot.lds命令修改：.text:{arch/arm/cpu/arm920t/start.o(.text)board/samsung/micro2440/libmicro2440.o(.text)*(.text)}.text:{arch/arm/cpu/arm920t/start.a(.text)board/samsung/micro2440/'Libmicro2449.0(.text)气.text)}在根目录下执行geditarch/arm/cpu/arm920t/start.S命令添加下面蓝色字体的内容，黑色字体用于定位#ifndefCONFIG_SKIP_LOWLEVEL_INITblcpu_init_crit#endif#ifdefCONFIG_S3C2440_NAND_BOOTldrsp,=0x30008000ldrr0,=0x0;ldrr1,_end_ofsmovr1,r1,LSR#11addr1,r1,#1ldrr2,=(CONFIG_SYS_TEXT_BASE)blnand_readldrpc,=relocations#endifcopy_loop:ldmiar0!,{r9-r10}/*copyfromsourceaddress[r0]*/stmiar1!,{r9-r10}/*copytotargetaddress[r1]*/cmpr0,r2/*untilsourceendaddress[r2]*/blocopy_loop#ifdefCONFIG_S3C2440_NAND_BOOTrelocations:ldrr6,=CONFIG_SYS_TEXT_BASE#endif#ifndefCONFIG_PRELOADER/**fix.rel.dynrelocations*/clbss_l:strr2,[r0]/*clearloop...*/addr0,r0,#4cmpr0,r1bneclbss_lblcoloured_LED_initblred_LED_on#endif#ifdefCONFIG_S3C2440_NAND_BOOTldrsp,=(CONFIG_SYS_INIT_SP_ADDR)bicsp,sp,#7/*8-bytealignmentforABIcompliance*/ldrr0,=0x00000000ldrpc,=board_init_f#endif/*Wearedone.Donotreturn,insteadbranchtosecondpartofboardinitialization,nowrunningfromRAM.*/#ifdefCONFIG_NAND_SPL(5)在根目录下进入include/configs文件夹执行geditmicro2440.h命令root@ubuntu：/home/uboot/u-boot-2011.03/include/configs#geditmicro2440.h#defineCONFIG_S3C2440_NAND_BOOT/*#defineCONFIG_SKIP_LOWLEVEL_INIT*/#defineCDNFlO3C2440-NAND_B00T//#defineCONFIGSKIPLOWLEVELINIT(6)在根目录下进入arch/arm/lib文件夹执行geditboard.c命令roojjaubuntu：/hame/uboot/u-boot-2011.B3/arch/arm/lib#aedit.board.c修改一下内容：voidboard_init_f(ulongbootflag){gd->mon_len=_bss_end_ofs+0x100000;/*why*//*relocate_code(addr_sp,id,addr);*/#ifdefCONFIG_S3C2440_NAND_BOOT/*addbywzc*/__asmvolatile__("movsp,%0〃：：〃r〃(addr_sp):〃sp〃)；/*addbywzc*/board_init_r(id,addr);#elserelocate_code(addr_sp,id,addr);/*NOTREACHED-relocate_code()doesnotreturn*/#endif}+board.cXdebugfrelocatiDfitfTtsetis：gd->reloc_ott)；memcpy(idr(void*)gdrsizeof(gdt));/*relocatecode(addrsp,id,addr);*/#lfdefCONFIG_S3C2440NAND_B00T/*addbyw