在uClinux文件系统中增加应用程序

　　编写hello.c程序，代码如下：

　　#include

　　int main()

　　{

　　int i;

　　for(i=0;i<6;i++)

　　{

　　printf("i=%d\n",i);

　　printf("Hello,embedded linux\n");

　　}

　　return 0;

　　}

　　编译hello.c

　　linux-dist$">stuyou@UBUNTU:/usr/local/src/uClinux-dist$ sudo arm-elf-gcc -elf2flt -o hello hello.c

　　生成hello，hello.gdb

　　挂载romfs

　　stuyou@UBUNTU:/usr/local/src/uClinux-dist/images$ mkdir romfs_dir

　　stuyou@UBUNTU:/usr/local/src/uClinux-dist/images$ sudo mount -o loop romfs.img romfs_dir

　　拷贝hello

　　stuyou@UBUNTU:/usr/local/src/uClinux-dist/images$ sudo cp ../hello ./romfs_dir

　　出错

　　cp: cannot create regular file `romfs_dir/bin/hello': Read-only file system

　　复制根文件系统到一个新到目录中

　　stuyou@UBUNTU:/usr/local/src/uClinux-dist/images$ sudo mkdir new_romfs

　　stuyou@UBUNTU:/usr/local/src/uClinux-dist/images$ sudo cp -r romfs_dir/* new_romfs

　　拷贝hello

　　stuyou@UBUNTU:/usr/local/src/uClinux-dist/images$ sudo cp ../hello new_romfs/bin

　　生成新的romfs映像

　　stuyou@UBUNTU:/usr/local/src/uClinux-dist/images$ sudo genromfs -f romfs_new.img -d new_romfs/

　　修改skyeye.conf，使之使用新的映像

　　#skyeye config file sample

　　arch:arm

　　cpu: arm7tdmi

　　mach: at91

　　mem_bank: map=M, type=RW, addr=0x00000000, size=0x00004000

　　mem_bank: map=M, type=RW, addr=0x01000000, size=0x00400000

　　mem_bank: map=M, type=R, addr=0x01400000, size=0x00400000, file=./romfs_new.img

　　mem_bank: map=M, type=RW, addr=0x02000000, size=0x00400000

　　mem_bank: map=M, type=RW, addr=0x02400000, size=0x00008000

　　mem_bank: map=M, type=RW, addr=0x04000000, size=0x00400000

　　mem_bank: map=I, type=RW, addr=0xf0000000, size=0x10000000

　　#set nic info

　　#net: type=cs8900a, base=0xfffa0000, size=0x20,int=16, mac=0:4:3:2:1:f, ethmod=tuntap, hostip=10.0.0.1

　　net: type=cs8900a, ethmod=tuntap, hostip=10.0.0.1

　　uart: mod = term

　　#dbct: state=on

　　在skyeye上启动uClinux

　　stuyou@UBUNTU:/usr/local/src/uClinux-dist/images$ skyeye -c skyeye.conf -e linux

　　得到如下启动信息：

　　Your elf file is little endian.

　　arch: arm

　　cpu info: armv3, arm7tdmi, 41007700, fff8ff00, 0

　　mach info: name at91, mach_init addr 0x80605a0

　　ethmod num=1, mac addr=0:0:0:0:0:0, hostip=10.0.0.1

　　failed to setup_module (name:net, type:cs8900a)

　　tapif_init: icotl TUNSETIFF erroruart_mod:0, desc_in:, desc_out:, converter:

　　SKYEYE: use arm7100 mmu ops

　　Loaded ROM ./romfs_new.img

　　exec file "linux"'s format is elf32-little.

　　load section .init: addr = 0x01000000 size = 0x0000a000.

　　load section .text: addr = 0x0100a000 size = 0x000dccd0.

　　load section .data: addr = 0x010e8000 size = 0x00009ce4.

　　not load section .bss: addr = 0x010f1d00 size = 0x000220a0 .

　　not load section .debug_abbrev: addr = 0x00000000 size = 0x0003d30e .

　　not load section .debug_info: addr = 0x00000000 size = 0x0186c1ff .

　　not load section .debug_line: addr = 0x00000000 size = 0x00304551 .

　　not load section .debug_pubnames: addr = 0x00000000 size = 0x0000c30b .

　　not load section .debug_aranges: addr = 0x00000000 size = 0x00002438 .

　　call armul_InitSymTable,kernel filename is linux.

　　start addr is set to 0x01000000 by exec file.

　　Linux version 2.4.31-uc0 (root@UBUNTU) (gcc version 2.95.3 20010315 (release)(ColdFire patches - 20010318 from http://fiddes.net/coldfire/)(uClinux XIP and shared lib patches from http://www.snapgear.com/)) #1 Thu May 13 15:02:46 CST 2010

　　Processor: Atmel AT91M40xxx revision 0

　　Architecture: EB01

　　On node 0 totalpages: 1024

　　zone(0): 0 pages.

　　zone(1): 1024 pages.

　　zone(2): 0 pages.

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