National Chung Cheng University ,Taiwan ,R.O.C

eCos demousing x86 PCs

I-Hung Lin

Date:2004/4/29

Introduction of Redboot

Redboot

(Red Hat Embedded Debug and Bootstrap )

Support for connection to a host-based debugger :

Serial (RS-232)

Ethernet (BOOTP, DHCP,TFTP )

Scenario

Host x86 Target x86

RS232

Redhat Linux 7.3 Redboot

Step by step

install eCos on host Set configtools on host Start redboot on target by Floppy disk Connect via RS-232 Using gdb to remote debug Run “hello world” example

Toolchain

binutils gcc ecosconfig configtool Good news is that you can use the prebuil

d toolchain of eCos and it works fine!

Choice a site

Choice 2 for i386 pc

Building eCos Kernel

cd /opt/ecos ; source ecosenv.sh cd /opt/ecos/ecos-2.0/work/ mkdir ecos-pc ecos-pc-redboot applications cd ecos-pc ecosconfig new pc configtool ecos.ecc

Choose Floppy

set baudrate (Default)

Default console channel 2

Building application cd /opt/ecos/ecos-2.0/work/ mkdir applications ; cd applications vi hello.c

i386-elf-gcc -g -D__ECOS –I../ecos-pc/install/include \ h

ello.c –L../ecos-pc/install/lib -Ttarget.ld -nostdlib i386-elf-objcopy -O binary a.out dd conv=sync if=a.out of=/dev/fd0

#include <stdio.h>

int main(void)

{

printf(“hello world!\n”);

return 0;

}

See in target PC

Insert the floppy disk and boot. You will directly see on the monitor.

Hello world!

Host commands# cd /opt/ecos/red_install/bin # ls -ial509699 -rwxr-xr-x 1 root root 52160 Apr 28 10:15 redboot.bin509698 -rwxr-xr-x 1 root root 269765 Apr 27 18:29 redboot.elf

# dd conv=sync if=redboot.bin of=/dev/fd0# cd /opt/ecos/ecos-2.0/example

# i386-elf-gcc -g -I/opt/ecos/work_install/include hello.c -L/opt/ecos/work_install/lib -Ttarget.ld –nostdlib

(Note that work is another template which packages type “default”!)

# i386-elf-gdb –nw a.out

(continued in next page)

#GNU gdb 5.3 (eCosCentric) Copyright 2002 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Publ

ic License, and you are welcome to change it and/or distribute copies of it under

certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show w

arranty" for details. This GDB was configured as "--host=i686-pc-linux-gnu

--target=i386-elf"... (gdb) set remotebaud 38400 (gdb) target remote /dev/ttyS0 (gdb) load

Gdb remote debug setting

Reference

http://sources.redhat.com/ecos/

http://sources.redhat.com/redboot/

http://sources.redhat.com/ml/ecos-discuss/

http://www.sfc.wide.ad.jp/~kei/ecos.html

http://www.mlbassoc.com/examples/build_hello.html

Especially Thank Mohasin for his useful advice.

<mohasin.zaki@wipro.com>