Re: Makefile for a simple program

Hi Bob,

Bob Brusa wrote:
> Morning Greg
> stand alone. The board has dBUG loaded and I use it to download and launch
> my helloworld program. But it crashes, probably because the startup file
> or the libraries or both used during the link process are not the right
> ones.

Yep, that will be the case. By default that toolchain will link
with startup code and libs appropriate for a uClinux application
(ie that expects to be run on a uClinux kernel). It won't be
appropriate for a bare metal system.

You could pull startup code from a boot loader, and probably
a printf() as well, and link it altogether with that toolchain.
Something like CoLilo is pretty simple, but there are others
around too.

Regards
Greg



> Regards Bob
> 
> PS1: When sending or answering a mail to [email protected] - what
> should be the entry in the field "replay to". Up to now, I put
> [email protected] there - and rarely got an answer - then I put my own
> mail address there and got your answer. Coincidence or something else?

On most emailers you can just hit "Reply All" and it will get the
headers correct.


> PS2: The first attempt to answer to [email protected] failed. I got 
> an error message. It seems [email protected] is considered a spammer. I 
> did what the error message told me I should do to fix the problem. See 
> if it helps.
> 
> On Wed, 06 Feb 2008 01:45:47 +0100, Greg Ungerer <[email protected]> wrote:
> 
>> Hi Bob,
>>
>> Bob Brusa wrote:
>>> Hm, it seems simple, but it is not. I have tried a lot and get errors 
>>> only.
>>>  I use a COBRA5282-board (with dBUG ready) and I want to compile, 
>>> link, download and execute the simple helloworld-program shown below:
>>> ----------------------------------
>>> #include <stdio.h>
>>>  int main(void)
>>> {
>>>     printf("Hello World\n");
>>>     return 0;
>>> }
>>> -----------------------------------
>>>  I use the toolchain installed by executing the script 
>>> m68k-uclinux-tools-20061214.sh (downloaded from 
>>> http://www.uclinux.org/pub/uClinux/m68k-elf-tools/)
>>> My present understanding is, that the makefile should use a prefix of 
>>> m68k-uclinux and hence invoke gcc as m68k-uclinux-gcc. But there are 
>>> options (and more) required and I do not really see which ones. Does 
>>> anyone have a "proposal" how my makefile should look like?
>>
>> Are you trying to build a uClinux application, or a stand alone
>> run-on-bare-metal binary?
>>
>> The above toolchain can of course do both, but you will supply
>> a different set of compile options.
>>
>> If compiling a stand alone binary you will need some assembler start
>> up code, and a library to supply a bare-metal printf as well.
>> The above toolchain does not have those in it. (It does have
>> libraries and startup code for uClinux applications though).
>>
>> Regards
>> Greg
>>
>>
>>
>>> Thank you and best regards
>>> Bob
>>>  PS: Download to the board using tftp works fine, but the binaries I 
>>> get from my makefile do not work.
>>>  --Bob Brusa                [email protected]
>>> Chapfwiesenstr. 14       ph: +4144 926 74 74
>>> CH-8712 Stäfa            fx:   +4144 926 73 34
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>>
> 
> 
> 
> --Bob Brusa                [email protected]
> Chapfwiesenstr. 14       ph: +4144 926 74 74
> CH-8712 Stäfa            fx:   +4144 926 73 34
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> 

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