[ECOS] [redboot] Compiling & Linking Apps.

[Gary Thomas]

On Mon, 2006-03-20 at 12:02 +0000, David Fernandez wrote:
> 	Hi there,
> 
> 	I'm trying to compile applications to run in the redboot environment;
> but I couldn't find any good way in the eCos distribution.
> 
> 	Following the eCos documentation in chapter 13 it seems that the
> Makefile there tries to link the entire redboot again with for example,
> hello.c (and there is a problem with -finit-priority that the redboot
> makefiles leave in ECOS_GLOBAL_CFLAGS in
> <INSTALL_DIR>/include/pkgconf/ecos.mak).
> 
> 	Should I write my own linker script & makefile, or is there anything in
> eCos sources to achieve that?
> 
> 	I've been looking to be able to use the C library in the applications
> too... but, as redboot does not provide a dynamic linker I was wondering
> if could it be relatively straightforward to modify language/c/... to
> get virtual vectors for all or some of the libc functions and modify the
> exec command to relocate elf objects.

You're looking at this the wrong way - RedBoot provides a bootstrap
environment, suitable for downloading (and otherwise managing) *user*
applications.  It is a special eCos program, using it's own template,
etc.

User applications on the other hand, are built separately.  This
often includes the basic C libraries, etc, based on the template
chosen.  Once this application is built, it can be downloaded and
run _using_ RedBoot.

Look at some simple examples:
  http://www.mlbassoc.com/examples

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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