RE: [ECOS] how to build an eCos library for ARM7tdmi simulator

[Scott Dattalo <scott at dattalo dot com>]

On Thu, 29 Aug 2002, Robert Cragie wrote:

> I have started to use SID (http://sources.redhat.com/sid). This emulates
> complete target hardware systems, e.g. the ARM PID, which is based on an
> ARM7T. Additional components can be added and the SID configuration file
> changed to emulate virtually any target hardware. It is also open source.
> 
> With a bit of tweaking, I have managed to get a program similar to
> 'twothreads.c' to successfully run on the SID pid7t target using the full
> eCos environment and using GDB (Insight) to download and debug the program.
> I can provide details of what I had to do if you're interested; note however
> that I am using Linux as the host OS, so I cannot give you any help  for
> Windows, but in theory it should be able to run with cygwin.

I've done the same thing as Robert. I ported my whole application - ~6Megs 
worth - to an ARM and simulated with SID. I then used arm-elf-gprof to 
optimize it!

My development setup went something like this:

 -- start with a completed application (that happened to be mostly POSIX 
compatible).

 -- modified it to compile under Linux.

 -- debugged it under Linux

 -- modified it to compile with the arm-elf tool chain. The differences 
between the desktop Linux and ARM versions were demarcated with #defines

 -- debugged it under arm-elf-gdb targetting both the simulator and SID.


At this point I had one application and two makefile's. I could debug the 
application in either enviroment. In fact, several times I had DDD and 
Insight running side-by-side each single stepping through the same chunk 
of code! This proved invaluable (for example a "char" declaration is 
default signed in Linux's gcc but unsigned in the arm-elf-gcc).


Now I'm moving over to REAL hardware. I've got Redboot on my hacked EB40
which enables to me debug through the serial port. I can do the same as
before except instead of simulating I run the real thing!

I realize this I'm answering more than you asked... but a positive 
testimony is always encouraging! Oh - and this list is an invaluable 
resource.

Scott


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