如何构建BootLoader
构建BootLoader
在网上直接下载u-boot-1.1.6.tar.bz2文件包，并通过samba服务器存于linux系统中去。
root@zxcUbuntu:/home/zxc/ARM9_S3C2440# mkdir ARM_UBOOT ##建立u-boot存放的目录
root@zxcUbuntu:/home/zxc/ARM9_S3C2440# cp /home/zxc/samba_share/u-boot-1.1.6.tar.bz2 /home/zxc/ARM9_S3C2440/ARM_UBOOT ###将u-boot文件复制到u-boot目录下
root@zxcUbuntu:/home/zxc/ARM9_S3C2440# cd ARM_UBOOT###进入u-boot压缩文件的目录
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT#tar –xjvf u-boot-1.1.6.tar.bz2###解压u-boot的源码包
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT# cd u-boot-1.1.6##进入u-boot源代码的根目录
移植U-BOOT的工作主要集中在对其源文件目录中特定文件的修改。
在board目录下有个smdk2410的子目录，但是没有smdk2440的子目录，这说明该u-boot只支持S3C2410，不支持S3C2440。
但是因为S3C2410与S3C2440很相似，可以在S3C2410源代码的基础上修改适用于S3C2440的U-Boot。
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/board#cp –R smdk2410 TQ2440##连同目录及其内的文件全部复制
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/board# cd TQ2440#####进入目录
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/board/TQ2440# mv smdk2410.c TQ2440.c###改名
将TQ2440目录下的Makefile的第28行：
COBJS:=smdk2410.o flash.o
改为
COBJS:=TQ2440.o flash.o
（注意Makefile文件的写法）
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6#cp include/configs/smdk2410.h include/configs/TQ2440.h
在u-boot-1.1.6目录下的Makefile文件下的第1882行修改：
接恶习他着
最后执行make命令，得到u-boot.bin文件。
但是这里生成的u-boot.bin文件还是针对S3C2410的，并不能用在S3C2440上，这就需要修改代码了。
那么，应该修改哪里的代码呢？必须阅读源代码。那么多源代码，从哪个源代码开始读呢？当然是程序的第1行指令所在的文件，但这个文件是哪个呢？
查看make过程最后的连接命令：
其中有一个-T参数，/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/board/TQ2440/u-boot.lds，可得链接脚本是/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/board/TQ2440/u-boot.lds，到相应目录下查看该脚本：
可知，程序第一条指令所在源代码文件是cpu/arm920t/start.S
在start.S文件的第129行添加：
#define REFCNT 1269
进入/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/board/TQ2440目录的文件TQ2440.c。
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/board/TQ2440#sudo gedit TQ2440.c
必须修改该代码的第77行和83行，
修改/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/cpu/arm920t/s3c24x0目录下的speed.c文件。
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/cpu/arm920t/s3c24x0#sudo gedit speed.c
（现成文件，整体复制）
修改/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/include目录下的文件s3c24x0.h
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/include#sudo gedit s3c24x0.h
修改/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/include/configs目录下的TQ2440.h文件，将其81行的注释去掉。
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/include/configs#sudo gedit TQ2440.h
到此，执行make命令
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6#make
此时会产生错误
根据提示，修改/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/include/configs目录下的TQ2440.h文件，
在其倒数第二行增加宏定义
#define CFG_MAX_NAND_DEVICE 1
#define NAND_MAX_CHIPS 1
#define CFG_NAND_BASE 0
再执行make命令
root@zxcUbuntu:/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6#make
此时还会产生错误
新建/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/cpu/arm920t/s3c24x0/nand_flash.c
（现成文件，直接复制）
在/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/include目录下的文件s3c24x0.h文件中，仿照S3C2410_NAND定义2440的Nand Flash控制器寄存器的数据结构，以供board_nand_init函数使用。
在/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/include目录下的文件s3c2410.h文件中，仿照S3C2410_GetBase_NAND定义函数S3C2440_GetBase_NAND，以供board_nand_init函数使用。
修改/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/cpu/arm920t/s3c24x0目录下的Makefile文件的第29行：。
到此，该U-Boot已经可以在s3c2440上运行了。但是，该U-Boot有很多缺点，比如：提示符不是你自己的logo；不能执行ping命令；不能在命令行进行编辑，不能记忆历史命令；不能自动加载Linux操作系统……
下面将一一解决（其实只要/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.1.6/include/configs目录下的TQ2440.h文件即可）
/home/zxc/ARM9_S3C2440/ARM_UBOOT/u-boot-1.3.4/cpu/arm920t/s3c24x0/interrupts.c
interrupts.c:1: warning: target CPU does not support interworking
interrupts.c: In function 'Timer_InitEx':
interrupts.c:250: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c:250: error: (Each undeclared identifier is reported only once
interrupts.c:250: error: for each function it appears in.)
interrupts.c: In function 'Timer_StopEx':
interrupts.c:274: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: In function 'IsrWatchdog':
interrupts.c:285: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: In function 'Isr_Init':
interrupts.c:319: error: 'ISR_TIMER4_OFT' undeclared (first use in this function)
interrupts.c:320: error: 'ISR_WDT_OFT' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:332: warning: function declaration isn't a prototype
interrupts.c:360: error: redefinition of 'ClearPending'
interrupts.c:241: error: previous definition of 'ClearPending' was here
interrupts.c:366: error: redefinition of 'Timer_InitEx'
interrupts.c:247: error: previous definition of 'Timer_InitEx' was here
interrupts.c: In function 'Timer_InitEx':
interrupts.c:370: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:376: error: redefinition of 'Timer_StartEx'
interrupts.c:257: error: previous definition of 'Timer_StartEx' was here
interrupts.c:388: error: redefinition of 'Timer_StopEx'
interrupts.c:269: error: previous definition of 'Timer_StopEx' was here
interrupts.c: In function 'Timer_StopEx':
interrupts.c:394: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:402: error: redefinition of 'IsrWatchdog'
interrupts.c:283: error: previous definition of 'IsrWatchdog' was here
interrupts.c: In function 'IsrWatchdog':
interrupts.c:405: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:410: error: redefinition of 'IsrTimer4'
interrupts.c:291: error: previous definition of 'IsrTimer4' was here
interrupts.c:417: error: redefinition of 'Dummy_isr'
interrupts.c:298: error: previous definition of 'Dummy_isr' was here
interrupts.c:423: error: redefinition of 'Isr_Init'
interrupts.c:304: error: previous definition of 'Isr_Init' was here
interrupts.c: In function 'Isr_Init':
interrupts.c:439: error: 'ISR_TIMER4_OFT' undeclared (first use in this function)
interrupts.c:440: error: 'ISR_WDT_OFT' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:452: warning: function declaration isn't a prototype
interrupts.c:451: error: redefinition of 'IRQ_Handle'
interrupts.c:332: error: previous definition of 'IRQ_Handle' was here
interrupts.c:480: error: redefinition of 'ClearPending'
interrupts.c:241: error: previous definition of 'ClearPending' was here
interrupts.c:486: error: redefinition of 'Timer_InitEx'
interrupts.c:247: error: previous definition of 'Timer_InitEx' was here
interrupts.c: In function 'Timer_InitEx':
interrupts.c:490: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:496: error: redefinition of 'Timer_StartEx'
interrupts.c:257: error: previous definition of 'Timer_StartEx' was here
interrupts.c:508: error: redefinition of 'Timer_StopEx'
interrupts.c:269: error: previous definition of 'Timer_StopEx' was here
interrupts.c: In function 'Timer_StopEx':
interrupts.c:514: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:522: error: redefinition of 'IsrWatchdog'
interrupts.c:283: error: previous definition of 'IsrWatchdog' was here
interrupts.c: In function 'IsrWatchdog':
interrupts.c:525: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:530: error: redefinition of 'IsrTimer4'
interrupts.c:291: error: previous definition of 'IsrTimer4' was here
interrupts.c:537: error: redefinition of 'Dummy_isr'
interrupts.c:298: error: previous definition of 'Dummy_isr' was here
interrupts.c:543: error: redefinition of 'Isr_Init'
interrupts.c:304: error: previous definition of 'Isr_Init' was here
interrupts.c: In function 'Isr_Init':
interrupts.c:559: error: 'ISR_TIMER4_OFT' undeclared (first use in this function)
interrupts.c:560: error: 'ISR_WDT_OFT' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:572: warning: function declaration isn't a prototype
interrupts.c:571: error: redefinition of 'IRQ_Handle'
interrupts.c:332: error: previous definition of 'IRQ_Handle' was here
interrupts.c:600: error: redefinition of 'ClearPending'
interrupts.c:241: error: previous definition of 'ClearPending' was here
interrupts.c:606: error: redefinition of 'Timer_InitEx'
interrupts.c:247: error: previous definition of 'Timer_InitEx' was here
interrupts.c: In function 'Timer_InitEx':
interrupts.c:610: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:616: error: redefinition of 'Timer_StartEx'
interrupts.c:257: error: previous definition of 'Timer_StartEx' was here
interrupts.c:628: error: redefinition of 'Timer_StopEx'
interrupts.c:269: error: previous definition of 'Timer_StopEx' was here
interrupts.c: In function 'Timer_StopEx':
interrupts.c:634: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:642: error: redefinition of 'IsrWatchdog'
interrupts.c:283: error: previous definition of 'IsrWatchdog' was here
interrupts.c: In function 'IsrWatchdog':
interrupts.c:645: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:650: error: redefinition of 'IsrTimer4'
interrupts.c:291: error: previous definition of 'IsrTimer4' was here
interrupts.c:657: error: redefinition of 'Dummy_isr'
interrupts.c:298: error: previous definition of 'Dummy_isr' was here
interrupts.c:663: error: redefinition of 'Isr_Init'
interrupts.c:304: error: previous definition of 'Isr_Init' was here
interrupts.c: In function 'Isr_Init':
interrupts.c:679: error: 'ISR_TIMER4_OFT' undeclared (first use in this function)
interrupts.c:680: error: 'ISR_WDT_OFT' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:692: warning: function declaration isn't a prototype
interrupts.c:691: error: redefinition of 'IRQ_Handle'
interrupts.c:332: error: previous definition of 'IRQ_Handle' was here
interrupts.c:720: error: redefinition of 'ClearPending'
interrupts.c:241: error: previous definition of 'ClearPending' was here
interrupts.c:726: error: redefinition of 'Timer_InitEx'
interrupts.c:247: error: previous definition of 'Timer_InitEx' was here
interrupts.c: In function 'Timer_InitEx':
interrupts.c:730: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:736: error: redefinition of 'Timer_StartEx'
interrupts.c:257: error: previous definition of 'Timer_StartEx' was here
interrupts.c:748: error: redefinition of 'Timer_StopEx'
interrupts.c:269: error: previous definition of 'Timer_StopEx' was here
interrupts.c: In function 'Timer_StopEx':
interrupts.c:754: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:762: error: redefinition of 'IsrWatchdog'
interrupts.c:283: error: previous definition of 'IsrWatchdog' was here
interrupts.c: In function 'IsrWatchdog':
interrupts.c:765: error: 'BIT_WDT_AC97' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:770: error: redefinition of 'IsrTimer4'
interrupts.c:291: error: previous definition of 'IsrTimer4' was here
interrupts.c:777: error: redefinition of 'Dummy_isr'
interrupts.c:298: error: previous definition of 'Dummy_isr' was here
interrupts.c:783: error: redefinition of 'Isr_Init'
interrupts.c:304: error: previous definition of 'Isr_Init' was here
interrupts.c: In function 'Isr_Init':
interrupts.c:799: error: 'ISR_TIMER4_OFT' undeclared (first use in this function)
interrupts.c:800: error: 'ISR_WDT_OFT' undeclared (first use in this function)
interrupts.c: At top level:
interrupts.c:812: warning: function declaration isn't a prototype
interrupts.c:811: error: redefinition of 'IRQ_Handle'
interrupts.c:332: error: previous definition of 'IRQ_Handle' was here
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