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Embedded GNUstep: mySTEP
There is a "fork" of GNUstep with optimizations for embedded systems. It is called "mySTEP" - my being the German pronunciation of the greek letter mu (for micro). More information can be found at http://www.quantum-step.com/wiki.php?page=mySTEP and the source file tree at http://www.quantum-step.com/download/sources/
Linksys NSLU2
The first thing you need to do is to generate a gcc cross compiler with Objective-C enabled. The GCC currently used on nslu2 only has C and C++ enabled when building the crosstool-native package.
- Check out unslung source using follow command
cvs -z3 -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/nslu co unslung
- Add in Objective-C as a language that needs to be enabled
perl -pi -e 's!^GCC_LANGUAGES=.*!GCC_LANGUAGES="c,c++,objc"!' toolchain/crosstool/nslu2-cross335.sh perl -pi -e 's!^GCC_LANGUAGES=.*!GCC_LANGUAGES="c,c++,objc"!' sources/crosstool-native/nslu2-native335.sh
- Compile the cross-compiler for an ARM CPU using gcc (here: on Debian 3.1 Linux)
tjyang@debian:~/unslung$ pwd /home/tjyang/unslung tjyang@debian:~/unslung$ rm toolchain/crosstool/.configured tjyang@debian:~/unslung$ rm toolchain/crosstool/.built tjyang@debian:~/unslung$ unset LD_LIBRARY_PATH tjyang@debian:~/unslung$ make toolchain tjyang@debian:~/unslung$ /export/home/tjyang/slug/unslung/toolchain/armv5b-softfloat-linux/gcc-3.3.5-glibc-2.2.5/bin/armv5b-softfloat-linux-gcc -v Reading specs from /export/home/tjyang/slug/unslung/toolchain/armv5b-softfloat-linux/gcc-3.3.5-glibc-2.2.5/lib/gcc-lib/armv5b-softfloat-linux/3.3.5/specs Configured with: /export/home/tjyang/slug/unslung/toolchain/crosstool/build/armv5b-softfloat-linux/gcc-3.3.5-glibc-2.2.5/gcc-3.3.5/configure --target=armv5b-softfloat-linux --host=i686-host_pc-linux-gnu --prefix=/export/home/tjyang/slug/unslung/toolchain/armv5b-softfloat-linux/gcc-3.3.5-glibc-2.2.5 --with-float=soft --with-cpu=xscale --enable-cxx-flags=-mcpu=xscale --with-headers=/export/home/tjyang/slug/unslung/toolchain/armv5b-softfloat-linux/gcc-3.3.5-glibc-2.2.5/armv5b-softfloat-linux/include --with-local-prefix=/export/home/tjyang/slug/unslung/toolchain/armv5b-softfloat-linux/gcc-3.3.5-glibc-2.2.5/armv5b-softfloat-linux --disable-nls --enable-threads=posix --enable-symvers=gnu --enable-__cxa_atexit --enable-languages=c,c++,objc --enable-shared --enable-c99 --enable-long-long Thread model: posix gcc version 3.3.5 [tjyang@dual unslung]$
- Do a simple test on the host machine
[tjyang@dual bin]$ pwd
/home/tjyang/slug/unslung/toolchain/armv5b-softfloat-linux/gcc-3.3.5-glibc-2.2.5/armv5b-softfloat-linux/bin
[tjyang@dual bin]$
[tjyang@dual bin]$ cat helloworld.m
#include <stdio.h>
int main(void)
{
printf("Hello World\n");
}
[tjyang@dual bin]$ ./gcc helloworld.m -lobjc -o helloworld
[tjyang@dual bin]$ file helloworld
hellow: ELF 32-bit MSB executable, ARM, version 1 (ARM), for GNU/Linux 2.4.3, dynamically linked (uses shared libs), not stripped
[tjyang@dual bin]$ uname -a
Linux dual 2.4.21-9.ELsmp #1 SMP Thu Jan 8 17:08:56 EST 2004 i686 i686 i386 GNU/Linux
[tjyang@dual bin]$
- The second step is to use this cross-compiler which only generates binaries for ARM CPUs to compile a native compiler. This compiler can only be run on a native ARM machine (here: nslu2).
[tjyang@dual unslung]$ make crosstool-native;make crosstool-native-ipk [tjyang@dual unslung]$ ls -lrt builds/*.ipk -rw-rw-r-- 1 tjyang tjyang 5569523 Feb 17 13:32 builds/crosstool-native-bin_0.28-rc37-3_armeb.ipk -rw-rw-r-- 1 tjyang tjyang 12677163 Feb 17 13:33 builds/crosstool-native-lib_0.28-rc37-3_armeb.ipk -rw-rw-r-- 1 tjyang tjyang 1722660 Feb 17 13:33 builds/crosstool-native-inc_0.28-rc37-3_armeb.ipk -rw-rw-r-- 1 tjyang tjyang 7049858 Feb 17 13:34 builds/crosstool-native-arch-bin_0.28-rc37-3_armeb.ipk -rw-rw-r-- 1 tjyang tjyang 9032668 Feb 17 13:34 builds/crosstool-native-arch-lib_0.28-rc37-3_armeb.ipk -rw-rw-r-- 1 tjyang tjyang 7483945 Feb 17 13:35 builds/crosstool-native-arch-inc_0.28-rc37-3_armeb.ipk -rw-rw-r-- 1 tjyang tjyang 1058 Feb 17 13:35 builds/crosstool-native_0.28-rc37-3_armeb.ipk [tjyang@dual unslung]$ cp /export/home/tjyang/slug/unslung/builds/*.ipk /disk76/nslu2/tmp/ [tjyang@dual unslung]$ login into your nslu2, cd to where the ipk packages are. run following commands. bash-2.05b# for i in *.ipk > do > ipkg -force-overwrite install $i > done Upgrading crosstool-native-arch-bin on root from 0.28-rc37-3 to 0.28-rc37-5... Configuring crosstool-native-arch-bin Upgrading crosstool-native-arch-inc on root from 0.28-rc37-3 to 0.28-rc37-5... Configuring crosstool-native-arch-inc Upgrading crosstool-native-arch-lib on root from 0.28-rc37-3 to 0.28-rc37-5... Configuring crosstool-native-arch-lib Upgrading crosstool-native-bin on root from 0.28-rc37-3 to 0.28-rc37-5... Configuring crosstool-native-bin Upgrading crosstool-native-inc on root from 0.28-rc37-3 to 0.28-rc37-5... Configuring crosstool-native-inc Upgrading crosstool-native-lib on root from 0.28-rc37-3 to 0.28-rc37-5... Configuring crosstool-native-lib Upgrading crosstool-native on root from 0.28-rc37-3 to 0.28-rc37-5... Configuring crosstool-native bash-2.05b# date Sat Feb 19 01:04:07 CST 2005 bash-2.05b#
- Try to compile the helloworld.m Objective-C file and run the helloworld binary on nslu2.
bash-2.05b# gcc helloworld.m -lobjc -o helloworld
bash-2.05b# file helloworld
helloworld: ELF 32-bit MSB executable, ARM, version 1 (ARM), for GNU/Linux 2.4.3, dynamically linked (uses shared libs), not stripped
bash-2.05b# ./helloworld
./helloworld: error while loading shared libraries: libobjc.so.1: cannot open shared object file: No such file or directory
bash-2.05b#
libobjc.so.1 is in /opt/armeb/armv5b-softfloat-linux/lib, this path need to be in LD_LIBRARY_PATH.
bash-2.05b# ./helloworld
Hello World
bash-2.05b# uname -a
Linux LKG7BFA96 2.4.22-xfs #1 Sat Jan 1 21:34:54 HST 2005 armv5b unknown unknown GNU/Linux
bash-2.05b# date
Thu Feb 17 11:35:19 CST 2005
bash-2.05b# cat compile.sh
/opt/armeb/armv5b-softfloat-linux/bin/gcc helloworld.m -o helloworld -lobjc
bash-2.05b# cat /etc/profile
PATH=/opt/bin:/share/hdd/data/public/nslu2/tjyang/unslung/staging/bin:${PATH}
TERM=xterm
export LD_LIBRARY_PATH=/opt/lib:/lib:/opt/armeb/armv5b-softfloat-linux/lib
export PATH TERM
bash-2.05b#
You can now use the Objective-C enabled GCC to compile the GNUstep core packages and GNUstep software. However, more strong testing is needed. Please add instructon below if you know how to run objective-c's testsuite in crosstool.
References: http://lists.gnu.org/archive/html/discuss-gnustep/2005-02/msg00124.html
LiveCD for Intel
Current version is 1.0
Find the instructions to install and the CD itself at GNUSTEP LiveCD Homepage
