硬件平台之间差异性

u-boot.lds cpsr_c, NandFlash CPU内部硬件控制器已经能工作u-boot.binNandFlashNandFlashu-boot.binNandFlash中拷贝到内存（外接1G）中393410436bss pc_start_armboot（伪指449 .word187c3e0020c: pc,[pc,#-4] ;c3e00210c3e00210 PC=0xc3e026b4,就表示Cu-boot.bin第2839c3e026b42840 {r4,r5,r6,钟，内存控制，串口，NandFlash控制器u-boot.bin（C3E00000）拷贝到MMUBSSldrpc_start_armboot(PCfor循环调用若start_armbootCsourceinsight .tar.bz2共享到windows下，并且解压u-addallboard.c/start_armboottypedefint(init_fnc_t)//init_fnc_t函数类型，该函数返回值为int，参数voidinit_fnc_tfor(init_fnc_ptr=*init_fnc_ptr;++init_fnc_ptr)if((*init_fnc_ptr)()!=0){hang();}} structglobal_data unsignedlongflags;unsignedlongbaudrate;unsignedlonghave_console;/*serial_init()wascalled*/unsignedlongreloc_off;/*RelocationOffset*/unsignedlongenv_addr;/*AddressofEnvironmentstruct*/unsignedlongenv_valid;/*ChecksumofEnvironmentvalid?*/unsignedlongfb_base; /*baseaddressofframebuffer*/#ifdefunsignedcharvfd_type;/*displaytype*/#if0unsignedlongcpu_clk; /*CPUclockinHz! unsignedlong ram_size;/*RAMunsignedlong /*statusregisteratboot*/ /*jumptable}typedefstructbd_info /*serialconsolebaudrate*/unsignedlongbi_ip_addr; /*IPAddress*/unsignedcharbi_enetaddr[6];/*Ethernetadress*/ uniqueidforthisboard*/wherethisboardexpectsparams /*configuration ulong ulong}} #ifdefCONFIG_HAS_ETH1/*secondonboardethernetport*/unsignedchar }#defineDECLARE_GLOBAL_DATA_PTRregistervolatilegd_t*gdasm("r8")CPUarm-linux-gcc-g-Os mon-ffixed-r8int{//#ifdef//CONFIG_DRIVER_SMC911X没有被定义，smc9115_pre_init不会执行，实际#ifdef//DM9000gd->bd->bi_arch_number=//2456TPADID号，不同开发板有不同的ID号gd->bd->bi_boot_params== //u-boot启动内核时，会给内核传递启动return}int{gd->bd->bi_dram[0].start= gd->bd->bi_dram[0].size= #ifgd->bd->bi_dram[1].start= gd->bd->bi_dram[1].size= //CPUmemmap是不一样的，所以此处初始化的s5pv210处理器的物理return}tarena# MAC ubuntu设定为 LCD的分 NandFlash bootargs=root=/dev/nfsinit=/linuxrc::eth0:onconsole=ttySAC0 stdout=serial bootdelaytarenau-boot令tftp ubuntu服务器上的 文件zImage(内核)到开发板的内存的0x tftp:通过tftp使用网络文件到开发板 Nandnanderase:擦除NandFlashnanderase nandwrite:Nandnand 处的zImage内核文件烧写在NandFlash的5M开始，写5M的内容nandread:nandFlash存nand 从nandFlash5M的地址开始读，读5M，读到内存的0x tarena#setenvbootcmd 在NandFlash5M地址tarena#setenv nand500000500000\;bootm#define

((unused,sectionattributeGNUCC语法的扩展，是GNUC的一大特色，可以用于设置cmd_tbl_t u_boot_cmd_start=u_boot_cmd_end=for(cmdtp= cmdtp!=&u_boot_cmd_end;cmdtp++)comman.c文件中 u_boot_cmd_go attribute ((unused,section//这个宏用于修饰u_boot_cmd_go，通到.u_boot_cmd指定的段中，以便于快速={go, CFG_MAXARGS,命令最大的参数个数 数 -startapplicationat"addr[arg...]\n -startapplicationataddress'addr'\n" passing'arg'asarguments\n"//帮}cmd_bootm.c文件中调用bootmU_BOOT_CMD(bootm,CFG_MAXARGS, -bootapplicationimagefrom"[addr[arg...]]\n -bootapplicationimagestoredinmemory\n""\tpassingarguments'arg...';whenbootingaLinuxkernel,\n""\t'arg'canbetheaddressofaninitrd#ifdefined(CONFIG_OF_LIBFDT)"\tWhenbootingaLinuxkernelwhichrequiresaflatdevice-"\tathirdargumentisrequiredwhichistheaddressofthe\n""\tdevice-treeblob.Tobootthatkernelwithoutaninitrdimage,\n""\tusea'-'forthesecondargument.Ifyoudonotpassathird\n""\tabd_infostructwillbepassed#if"\t\nForthenewmulticomponentuImageformat(FIT)addresses\n""\tmustbeextenedtoincludecomponentorconfigurationunitname:\n""\taddr:<subimg_uname>-directcomponentimagespecification\n" configurationspecification\n""\tUseiminfocommandtogetthelistofexistingcomponent\n""\timagesandconfigurations.\n" 2456:开发板的ID号 :uboot启动内核时，传递start.S-->8K代码在CPUlowlevel_init.S->CPU内部硬件控制器初化内存控制器，串口，NandFlash将整个u-bo