Bare-metal Cortex-M3 Evaluation Kits on Fedora F14

This page describes basic steps needed to:

• Connect to simple Cortex-M3 evaluation kits on Fedora F14,
• Compile bare-metal programs ie. with no libc for memory constrained evaluation kits.

The instructions have been tested with Stellaris EKK-LM3S811 evaluation kit.

Board Connection

1. install openocd

   yum install openocd
   

2. Connect the board to the computer, and start the openocd daemon as root:

   openocd -f interface/luminary-lm3s811.cfg -f board/ek-lm3s811.cfg 
   

3. Connect to the control port of the daemon:

   telnet localhost 4444
   

4. Type eg

   reset halt
   

5. Write one of the demo programs available on the kit's CD

   flash write_image erase /home/pawsa/dev/stellaris/./stellarisware/boards/ek-lm3s811/blinky/sourcerygxx/blinky.bin
   

6. ... and start it

   reset
   

Compiler Configuration on F14

1. Download avr-binutils.spec (eg. by downloading avr-binutils.src.rpm)
2. Apply following patch to avr-binutils.spec:

   diff --git a/avr-binutils.spec b/avr-binutils.spec
   --- a/avr-binutils.spec
   +++ b/avr-binutils.spec
   @@ -1,4 +1,4 @@
   -%define target avr
   +%define target arm-unknown-elf
    
    Name:           %{target}-binutils
    Version:        2.21
   

3. build rpm using: rpmbuild -ba avr-binutils.spec.
4. install the built arm-unknown-elf-binutils....rpm package.
5. download avr-gcc.spec
6. Apply the following patch to it:

   diff --git a/avr-gcc.spec b/avr-gcc.spec
   --- a/avr-gcc.spec
   +++ b/avr-gcc.spec
   @@ -1,4 +1,4 @@
   -%define target avr
   +%define target arm-unknown-elf
    
    Name:           %{target}-gcc
    Version:        4.5.1
   @@ -12,6 +12,7 @@ Source1:        ftp://ftp.gnu.org/gnu/gcc/gcc-%{version}/gcc-g++-%{version}.tar.
    Source2:        README.fedora
    Patch0:         avr-gcc-4.5.0-new_devices.patch
    Patch1:         avr-gcc-4.5.1-register-fix.patch
   +Patch2:         arm-gcc-4.5.1-build.patch
    
    BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-%(%{__id_u} -n)
    BuildRequires:  %{target}-binutils >= 2.13, zlib-devel gawk gmp-devel mpfr-devel libmpc-devel
   @@ -39,6 +40,11 @@ platform.
    pushd gcc-%{version}
    %patch0 -p0
    %patch1 -p1
   +%patch2 -p2 -b .arm
   +
   +find . -name configure.ac | xargs perl -pi -e 's,\(2.64\),(2.66),g'
   +find . -name override.m4 | xargs perl -pi -e 's,2.64,2.66,g;'
   +autoreconf
    
    contrib/gcc_update --touch
    popd
   @@ -71,8 +77,9 @@ pushd gcc-%{target}
    CC="%{__cc} ${RPM_OPT_FLAGS}" \
    ../gcc-%{version}/configure --prefix=%{_prefix} --mandir=%{_mandir} \
      --infodir=%{_infodir} --target=%{target} --enable-languages=c,c++ \
   -  --disable-nls --disable-libssp --with-system-zlib \
   +  --disable-nls --disable-libssp --disable-zlib \
      --enable-version-specific-runtime-libs \
   +  --without-headers \
      --with-pkgversion="Fedora %{version}-%{release}" \
      --with-bugurl="https://bugzilla.redhat.com/"
    # In general, building GCC is not smp-safe
   

   We add an additional patch, and assure that gcc's configure.ac scripts do not panic when encountering more recent autoconf version. We disable also gcc features that require libc.
7. This modified spec file refers to the following gcc patch: arm-gcc-4.5.1-build.patch

   
   --- arm-unknown-elf-gcc-4.5.1/gcc-4.5.1/configure.ac.arm	2010-06-24 23:06:37.000000000 +0200
   +++ arm-unknown-elf-gcc-4.5.1/gcc-4.5.1/configure.ac	2011-01-22 19:53:57.838808864 +0100
   @@ -30,7 +30,7 @@
    m4_include([lt~obsolete.m4])
    
    AC_INIT(move-if-change)
   -AC_PREREQ(2.64)
   +AC_PREREQ(2.66)
    AC_DISABLE_OPTION_CHECKING
    
    progname=$0
   @@ -589,7 +589,7 @@
        libgloss_dir=arm
        ;;
      arm-*-elf* | strongarm-*-elf* | xscale-*-elf* | arm*-*-eabi* )
   -    noconfigdirs="$noconfigdirs target-libffi target-qthreads"
   +    noconfigdirs="$noconfigdirs target-libffi target-qthreads target-libiberty target-libstdc++-v3 ${libgcj}"
        libgloss_dir=arm
        ;;
      arm*-*-linux-gnueabi)
   

   The purpose of the patch is to block building target-libiberty. We probably want to block it only for arm-unknown-*, not for all ARM architecture types.
8. Build rpm using: rpmbuild -ba avr-gcc.spec.
9. Install the built arm-unknown-elf-gcc....rpm package.

You should be ready to go!

Go back to Pawel Salek's home page.