[okl4-developer] Hello world on arm926ejs....

[Hugues Balp]

                          Hello everybody,

I first want to thank you for the good job that has been made around the 
OKL4 micro-kernel.
I' ve just registered to this mailing list after having downloaded OKL4 
v3.0 and
performed some installations and tests with the hello world example for 
arm926ejs targets...

Nevertheless  I encountered a number of problems during installation and 
compilation phases....
So I have now a number of questions and hope you will help me to 
understand what happens
on my system...

The first target I wanted to test is called versatile ( with an 
arm926ejs processor ).

So following the instructions of the OKL4 wiki, either in Prerequisite 
page as in the one
dedicated to the release 3.0, I have downloaded first the precompiled 
SDK for arm926ejs
target so as the arm-linux crosstool proposed in URL
    http://www.ertos.nicta.com.au/downloads/tools/arm-linux-3.4.4.tar.gz

After some installation steps I got the following error when trying to 
compile as follow
the singlecell example delivered within the sdk:

    cd $OKL4_SDK_ROOT/okl4/arm926ejs/examples/singlecell
    make clean
    make

The complete listing of the error is joined to this mail.
The error deals with* internal relocation errors* due to 
incompatibilities between binary libraries *ABI versions* as described below

"ERROR: build.micro-debug/src/hello.o is compiled for EABI version 0, 
whereas build.micro-debug/bin/hello is compiled for version 4"

What is amazing is to observe that ABI versions differ within the 
supplied precompiled sdk-arm926ejs itself, as illustrated by the
following commands:

    cd $OKL4_SDK_ROOT
    find . -name "*.o" -exec ls {} \; -exec readelf -h {} \; | egrep 
"Flags|arm926ejs"
    ./kernel/arm926ejs/micro-debug/object/arm926ejs.o
      Flags:                             0x200, GNU EABI, software FP
    ./kernel/arm926ejs/micro-debug/object/versatile.o
      Flags:                             0x200, GNU EABI, software FP
    ./kernel/arm926ejs/micro-debug_no_console/object/arm926ejs.o
      Flags:                             0x200, GNU EABI, software FP
    ./kernel/arm926ejs/micro-debug_no_console/object/versatile.o
      Flags:                             0x200, GNU EABI, software FP
    ./kernel/arm926ejs/micro-benchmark/object/arm926ejs.o
      Flags:                             0x200, GNU EABI, software FP
    ./kernel/arm926ejs/micro-benchmark/object/versatile.o
      Flags:                             0x200, GNU EABI, software FP
    ./kernel/arm926ejs/micro-production/object/arm926ejs.o
      Flags:                             0x200, GNU EABI, software FP
    ./kernel/arm926ejs/micro-production/object/versatile.o
      Flags:                             0x200, GNU EABI, software FP
    ./kernel/arm926ejs/micro-tracebuffers/object/arm926ejs.o
      Flags:                             0x200, GNU EABI, software FP
    ./kernel/arm926ejs/micro-tracebuffers/object/versatile.o
      Flags:                             0x200, GNU EABI, software FP
    ./okl4/arm926ejs/micro-debug/libs/crt0.o
      Flags:                             0x4000000, Version4 EABI
    ./okl4/arm926ejs/examples/singlecell/hello/build.micro-debug/src/hello.o
      Flags:                             0x200, GNU EABI, software FP
    ./okl4/arm926ejs/micro-production/libs/crt0.o
      Flags:                             0x4000000, Version4 EABI
    ./okl4/arm926ejs/nano-production/libs/crt0.o
      Flags:                             0x4000000, Version4 EABI
    ./okl4/arm926ejs/nano-debug/libs/crt0.o
      Flags:                             0x4000000, Version4 EABI

Another thing that I don't understand in the above error message comes 
from the fact that
the file build.micro-debug/src/hello.o  is really a binary object file,
    as illustrated by the following "file" command output:  ELF 32-bit 
LSB relocatable, ARM, version 1, not stripped
whereas the item build.micro-debug/bin/hello isn't really a file.
Indeed the only file that resides in directory 
$OKL4_SDK_ROOT/okl4/arm926ejs/examples/singlecell/hello/build.micro-debug/bin
is an XML file named hello.xml.
   So I imagine there is a binary file generated from this XML file ? I 
that true ?....

Another thing to add is that the error is the same either when I use the 
arm-linux toolchain referenced in the OKL4 wiki Prerequisite page
or with a self compiled crosstool chain with support for eabi ( as 
documented in the mailin-list archive ).
You can also refer to the joined configuration file of this toolchain.

To sum up I am just wondering me how I can get rid of this problem ?

I will send to you later other questions around the compilation of OKL4 
itself and its required crosstool chains....

    Thanks in advance for your help,

             Hugues Balp.
______________________________________________________________________________________________________________

    work:   Hugues.Balp at thalesgroup.com
    home:  Hugues.Balp at free.fr



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