EPSIAE » eneraptor

h1. Tutorial for cross-compiling for our ARM processor.

Just a short tutorial helping you build Buildroot that compiles programs for ARM. It is made for Ubuntu Linux, but should work on other distros too.

h2. To build the Buildroot

With @apt-get install@, you should get yourself following packages (you probably have some of them already, but just to be sure):

* build-essential - this installs a complete build environment

* libssl-dev 

* libncurses-dev

* bison

* flex

* texinfo

* zlib1g-dev

* gettext

* autoconf

* wget

* patch

Then you should set your shell to bash instead of dash, you do this with:

@#sudo dpkg-reconfigure dash@

And then select No

h2. Getting and compiling Buildroot

You can get our Buildroot here: "Buildroot-FRISMS":http://laps.fri.uni-lj.si/fri-sms/datoteke/buildroot-2009.11-fri.tar.bz2

Then you must extract the Buildroot to @/home/arm@ , so the location of your folder is @/home/arm/buildroot-2009.11-fri/@ , move into that folder and do:

#make

Compiling takes some time, check that there are no errors.

h2. Compiling our programs

After compiling Buildroot is done, you should add: @/PATH_TO_YOUR_FOLDER/buildroot-2009.11-fri/output/staging/usr/bin@   into your enviroment variable (PATH)

Then your Makefile for compiling programs should look something like this (made for simple helloworld with name main.c):

<pre>

CC=arm-linux-gcc

CFLAGS=-I. --sysroot=/PATH_TO_YOUR_FOLDER/buildroot-2009.11-fri/output/staging

OBJ=main.o

%.o: %.c

	$(CC) -c -o $@ $< $(CFLAGS)

main: $(OBJ)

	$(CC) -o $@ $^ $(CFLAGS)

.PHONY: clean

clean:

	rm -f *.o *~ main

</pre>