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

拷贝hello

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

拷贝hello

生成新的romfs映像

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

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.

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:

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！！