QEMU/GRUB: No multiboot header found

Massimo Tipaldi mtipaldi at cgspace.it
Mon Dec 22 15:22:28 UTC 2008

Dear Joel,

I have followed your suggestions, but unfortunately the same behaviour 
is observed.

In any case, I would like to point out some important points:

1) to compile RTEMS, in the directory /d/opt/rtems-4.9/bin, I was 
obliged to rename all the files in order to remove the version number 
(for instance, i386-rtems4.9-g++.exe --> i386-g++.exe).

2) to produce my Hello Word, I have updated the Makefile.inc 


prefix = /d/opt/rtems-4.9/build-rtems/i386/c/pc386
exec_prefix = /opt/rtems-4.9/i386-rtems

CC_FOR_TARGET = /d/opt/rtems-4.9/bin/i386-gcc --pipe 

CXX_FOR_TARGET = /d/opt/rtems-4.9/bin/i386-g++
AS_FOR_TARGET = /d/opt/rtems-4.9/bin/i386-as
AR_FOR_TARGET = /d/opt/rtems-4.9/bin/i386-ar
NM_FOR_TARGET = /d/opt/rtems-4.9/bin/i386-nm
LD_FOR_TARGET = /d/opt/rtems-4.9/bin/i386-ld
SIZE_FOR_TARGET = /d/opt/rtems-4.9/bin/i386-size
OBJCOPY_FOR_TARGET = /d/opt/rtems-4.9/bin/i386-objcopy


PROJECT_TOOLS = /d/opt/rtems-4.9/build-rtems/i386/pc386/build-tools


3) inside the MSYS shell, before launching the make command, I have 
carried out the following:
export ARCH=/d/opt/rtems-4.9/examples-4.9.1/hello_world_c

After that I have launched the make command in the folder:
My Hello Word is successfully compiled, but it is not correctly managed 
by  QEMU ("No multiboot Header found").
What I can further add, is that the dimension of my Hello Word is 17 Kb, 
whereas the dimension of the Hello Word that comes from the RTEMS 
compliation is about 1 Mb.

Does it sound strange? Should I modify the makefiles further in order to 
produce an executable file in line with the rtems boot loader multiboot 
specification? Can you suggest me something else?

Thanks in advance and I wish you a Merry Christmas and Happy New Year.


Joel Sherrill ha scritto:
> Massimo Tipaldi wrote:
>> Dear all,
>> I have installed all the RTEMS tools on Windows, compiled RTEMS 4.9
>> (--target=i386-rtems and bsp=pc386) and installed QEMU as detailed in:
>> http://www.rtems.com/wiki/index.php/MinGW_Tools_for_Windows
>> http://www.rtems.com/wiki/index.php/QEMU
>> All these operations went well.
>> Therefore, I have tried to launch some RTEMS applications by means of
>> QEMU/GRUB (in this phase I have taken the executable files produced
>> during the RTEMS compilation phase, placed in /testsuites/samples): this
>> operation was successfull as well.
>> After that I have compiled successfully Hello Word by myself
>> (examples-
>> ftp://ftp.rtems.com/pub/rtems/
>> ) and put my hello.exe in the folder /testsuites/samples/hello).
>> With my Hello Word, the GRUB gives me the message "No multiboot header
>> found".
> Very old examples.  Please use the ones which match 4.9.
> This sounds like a bug which was fixed between 4.9.0 and 4.9.1.
> 1337/bsps - Stripping .rodata section produces unusable executables for 
> the i386-rtems target.
>> As far as I have understood, my hello.exe does not have a multiboot 
>> header.
>> How can I overcome this issue? Should I modify somehow my source code or
>> the makefiles in order to create this multiboot header into my .exe?
>> Thanks in advance
>> Massimo Tipaldi


Eng. Massimo Tipaldi
Technical Directorate
SW Principal Engineer

Carlo Gavazzi Space SpA
Via Tiengo, snc - 82100 Benevento BN - Italy
Tel: + 39 0824481733
Fax: +39 0824481730
e-mail: mtipaldi at cgspace.it

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