在uClinux文件系统中增加应用程序

编写hello.c程序，代码如下：

　　#include <stdio.h>

　　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:///coldfire/)(uClinux XIP and shared lib patches from http://www./)) #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.

Kernel command line: root=/dev/rom0

　　Calibrating delay loop... 15.82 BogoMIPS

　　Memory: 4MB = 4MB total

　　Memory: 2936KB available (883K code, 180K data, 40K init)

　　Dentry cache hash table entries: 512 (order: 0, 4096 bytes)

　　Inode cache hash table entries: 512 (order: 0, 4096 bytes)

　　Mount cache hash table entries: 512 (order: 0, 4096 bytes)

　　Buffer cache hash table entries: 1024 (order: 0, 4096 bytes)

　　Page-cache hash table entries: 1024 (order: 0, 4096 bytes)

　　POSIX conformance testing by UNIFIX

　　Linux NET4.0 for Linux 2.4

　　Based upon Swansea University Computer Society NET3.039

　　Initializing RT netlink socket

　　Starting kswapd

　　Atmel USART driver version 0.99

　　ttyS0 at 0xfffd0000 (irq = 2) is a builtin Atmel APB USART

　　ttyS1 at 0xfffcc000 (irq = 3) is a builtin Atmel APB USART

　　Blkmem copyright 1998,1999 D. Jeff Dionne

　　Blkmem copyright 1998 Kenneth Albanowski

　　Blkmem 1 disk images:

　　0: 1400000-15123FF [VIRTUAL 1400000-15123FF] (RO)

　　RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize

　　NET4: Linux TCP/IP 1.0 for NET4.0

　　IP Protocols: ICMP, UDP, TCP

　　IP: routing cache hash table of 512 buckets, 4Kbytes

　　TCP: Hash tables configured (established 512 bind 512)

　　NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.

　　VFS: Mounted root (romfs filesystem) readonly.

　　Shell invoked to run file: /etc/rc

　　Command: hostname GDB-armulator

　　Command: /bin/expand /etc/ramfs.img /dev/ram0

　　Command: mount -t proc proc /proc

　　Command: mount -t ext2 /dev/ram0 /var

　　Command: mkdir /var/tmp

　　Command: mkdir /var/log

　　Command: mkdir /var/run

　　Command: mkdir /var/lock

　　Command: mkdir /var/empty

　　Command: cat /etc/motd

　　Welcome to

　　GDB/armulator support by

　　For further information check:

　　http://www./

　　Execution Finished, Exiting

　　Sash command shell (version 1.1.1)

　　/>

　　切换到/bin目录下

　　/> cd bin

　　/bin> ls

　　bcdm

　　boa

　　busybox

　　dhcpcd

　　expand

　　false

　　gdbserver

　　hello

　　ifconfig

　　inetd

　　init

　　login

　　mount

　　mtdm

　　ping

　　reboot

　　route

　　sh

　　telnetd

　　thdm

　　true

　　umount

　　看到了hello，执行

　　/bin> ./hello

　　i=0

　　Hello,embedded linux

　　i=1

　　Hello,embedded linux

　　i=2

　　Hello,embedded linux

　　i=3

　　Hello,embedded linux

　　i=4

　　Hello,embedded linux

　　i=5

　　Hello,embedded linux

　　/bin>

　　得到了正确到执行结果。

　　完毕！！