Sonic Alert 2.8 user manual Linux Support

5.3 Linux Support 16

5.3Linux Support

The Linux Environment for Boundary Devices boards consists of four pri- mary pieces, a toolchain, the kernel and device drivers, a user-space build tool based on PTXDist and a Javascript runtime used to demostrate the capabilities of the hardware.

5.3.1Crosstool Linux Toolchain

Before the kernel and applications can be built, it is first necessary to have a cross-compiler toolchain.

The following examples show how we at Boundary Devices set up our toolchains. Please refer to the crosstool site for more complete instructions.

First, you’ll need to download and unpack crosstool;

$wget http://kegel.com/crosstool/crosstool-0.37.tar.gz

$tar zxvf crosstool-0.37.tar.gz

As described in the crosstool Quick Start guide, the next step is to choose a starting point with one of the demo build scripts. We’re currently using demo-arm-xscale.sh with the following settings (GCC 3.4.3 with Glibc version 2.3.5):

TARBALLS_DIR=/armArchives

RESULT_TOP=/opt/crosstool

eval ‘cat arm-xscale.dat gcc-3.4.3-glibc-2.3.5.dat‘ sh all.sh --notest

We also build the compiler to use software floating point in user space, rather than hardware floating point (which traps to the kernel). To do this, modify arm-xscale.dat and add the --with-soft-float and --without-fp flags as shown below.

GCC_EXTRA_CONFIG="--with-cpu=xscale --enable-cxx-flags=-mcpu=xscale --with-float=soft" GLIBC_EXTRA_CONFIG="--without-fp"

Also, we typically change the TARGET to read as follows:

TARGET=arm-linux

because arm-linux-gcc is just too long!

Having completed these edits, you can execute the script as follows:

sh demo-arm-xscale.sh

December 28, 2005 Revision 2.8