目的：学习linxu编程，用bootloader跳转实现系统的运行。

skyeye：1.2.6版本

1.下载HelloWorld on Skyeye 源码
   http://download.pudn.com/downloads75/sourcecode/unix_linux/119128673Hello4Skyeye.rar
2.修改代码

2.1 修改hello.c

[root@localhost Hello4Skyeye]# cat hello.c
/*
* hello.c
* just a function used to output "helloworld" to uart
*
* author: SU Hang
* date:   2004-08-28
*/
void hello(void)
{
        int i;
        char * hellostr="helloworld";
        long* paddr=(long*)0x50000020; //这里的0x50000020 为2440 UTXH0端口地址

        for(i=0;i<10;i++)
        {
                * paddr=hellostr[i];
        }
        return;
}

2.2修改hello.lds

[root@localhost Hello4Skyeye]# cat hello.lds
/*
* hello.lds
* ld script for helloforSkyeye
*
* author: SU Hang
* Date:   2004-08-28
*/

OUTPUT_ARCH(arm)
ENTRY(begin)
SECTIONS
{
        . = 0x31000000; //修改程序的起始地址，这里设置成0x31000000
        .text :
        {
                *(.text)
                *(.rodata)
        }

        . = ALIGN(8192);

        .data : {*(.data)}

        .bss : {*(.bss)}

        /* Stabs debugging sections.    */
        .stab 0 : { *(.stab) }
        .stabstr 0 : { *(.stabstr) }
        .stab.excl 0 : { *(.stab.excl) }
        .stab.exclstr 0 : { *(.stab.exclstr) }
        .stab.index 0 : { *(.stab.index) }
        .stab.indexstr 0 : { *(.stab.indexstr) }
        .comment 0 : { *(.comment) }
        .debug_abbrev 0 : { *(.debug_abbrev) }
        .debug_info 0 : { *(.debug_info) }
        .debug_line 0 : { *(.debug_line) }
        .debug_pubnames 0 : { *(.debug_pubnames) }
        .debug_aranges 0 : { *(.debug_aranges) }

}

2.3 修改makefile

[root@localhost Hello4Skyeye]# vi makefile

#
#makefile for helloforSkyeye
#
#author: SU Hang
#Date:   2004-08-28

#begin
    CC=arm-linux-gcc
    LD=arm-linux-ld
    CFLAGS= -c -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -pipe -g -mapcs-32 -march=armv4 -mtune=arm7tdmi -mshort-load-bytes
    LDFLAGS= -p -X -Thello.lds
    LIB=

    all: hello.bin //结果需求bin文件
        arm-linux-objcopy --gap-fill=0xff -O binary hello hello.bin //新增 生成bin文件
    hello.bin: hello
    hello: start.o hello.o
        $(LD) $(LDFLAGS) start.o hello.o -o hello
    start.o:start.S
        $(CC) $(CFLAGS) start.S

    hello.o:hello.c
        $(CC) $(CFLAGS) hello.c
    clean:
        rm -rf *.o *.elf *.gdb hello *.r *.n *.s hello.bin

3.编译

[root@localhost Hello4Skyeye]# make clean

[root@localhost Hello4Skyeye]# make

生成hello.bin文件

4.编辑skyeye.conf文件

cpu: arm920t
mach: s3c2440

#physical memory
mem_bank: map=M, type=RW, addr=0x31000000, size=0x04000000,file=hello.bin,boot=yes
mem_bank: map=M, type=RW, addr=0x00000000, size=0x04000000

#all peripherals I/O mapping area
mem_bank: map=I, type=RW, addr=0x48000000, size=0x20000000
mem_bank: map=I, type=RW, addr=0x19000300, size=0x00000020

#net: state=on, type=cs8900a,mac=08:00:3e:26:0a:5b, ethmod=tuntap, hostip=10.0.0.1
#net: type=cs8900a, base=0x19000300, size=0x20,int=9, mac=0:4:3:2:1:f, ethmod=tuntap, hostip=10.0.0.1
#lcd:type=s3c2410x,mod=gtk
#dbct:state=on

hello.bin和skyeye.conf放到同一个文件夹下面；

执行：[root@localhost s3c2440]# skyeye

出现如下结果：