RTEMS on Xilinx Zedboard

[Chris Johns]

On 29/08/2016 05:00, Spencer Deevy wrote:
> Hello everyone, this is my first post here, so here goes.

Welcome to RTEMS and sorry about the time taken to reply.

>
> I've been trying to figure out how to configure RTEMS for the Zedboard
> development board for quite some time now, but with little luck..
>

I am testing and developing RTEMS on a MicroZed board so I hope I can help.

> I have looked through the board support packages, and I've tried
> building RTEMS for that board support package with the required cross
> compiler, but nothing seems to work.

A full build of all parts from source requires a few parts to come 
together. I use a FreeBSD package for the compiler to build u-boot. 
Everything else is from source.

> The two methods by which I can load an image onto the Zedboard are via
> the SD card, or by burning to the chip itself. I have more experience
> with burning images to the SD card, but either method would be fine.

I am using a 3rd option, u-boot on an SD card and booting over the 
network to download RTEMS to run.

> If anyone has a step-by-step guide for building RTEMS with a BSP, or
> even the Zedboard itself, that would be great. If anyone has any advice
> on where to start on this, it would be much appreciated. Let me know
> your thoughts.

1. Host machine is FreeBSD 10.3-RELEASE-p3.
  1.1 U-Boot needs an ARM compiler, using packages:
    arm-none-eabi-binutils-2.25.1_1
    arm-none-eabi-gcc-5.3.0

2. U-Boot
  2.1 From git:
     $ git clone git://git.denx.de/u-boot.git
  2.2 Local patch (attached).
  2.3 Build with:
     $ gmake CROSS_COMPILE=arm-none-eabi- CONFIG_API=y
  2.4 Copy spl/boot.bin to the SD card.
  2.5 Copy u-boot.img to the SD card.
  2.6 Create a suitable uEnv.txt to boot u-boot for your system.
       (My SD crad reader is at home at the moment)

3. RTEMS
  2.1 Build tools using the RSB for 4.12/rtems-arm.
  2.2 Get RTEMS from git:
     $ git clone git://git.rtems.org/rtems.git
    Note: this patch is need:
     https://lists.rtems.org/pipermail/devel/2016-August/015982.html
  2.3 Bootstrap
  2.4 Configure:
     $ ../rtems/configure --target=arm-rtems4.12 \
         --prefix=/opt/work/chris/rtems/kernel/4.12 \
         --disable-networking \
         --enable-rtemsbsp=xilinx_zynq_zedboard \
         --enable-smp \
         --enable-test
  2.5 Build:
     $ make -j 8
  2.6 Convert the RTEMS executable so u-boot can load it. I attach a
      script based on Pavel's posts. Please edit to your tools path:
     $ rtems-zynq-mkimg \
 
./arm-rtems4.12/c/xilinx_zynq_zedboard/testsuites/samples/ticker/ticker.exe
  2.7 Copy ticker.exe.img to the SD card or network download location.

Chris






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#! /bin/sh

OBJCOPY_FOR_TARGET=/opt/work/rtems/4.12/bin/arm-rtems4.12-objcopy
OBJCOPY="$OBJCOPY_FOR_TARGET"

EXE_NAME=$1

START_ADDR=0x00104000
ENTRY_ADDR=0x00104000

${OBJCOPY} -R -S --strip-debug -O binary "$EXE_NAME" "$EXE_NAME.bin" || exit 1
cat "$EXE_NAME.bin" | gzip -9 >"$EXE_NAME.gz"
mkimage \
  -A arm -O rtems -T kernel -a $START_ADDR -e $ENTRY_ADDR -n "RTEMS" \
  -d "$EXE_NAME.gz" "$EXE_NAME.img"