From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail
From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: STM32F4 GNAT Run Time System - roadmap
Date: Mon, 07 Dec 2015 22:02:36 +0000
Organization: A noiseless patient Spider
Message-ID: <lysi3dgbnn.fsf@pushface.org>
References: <lyzj49qecx.fsf@pushface.org> <ml96i2$3qs$2@dont-email.me>
	<lya8pnh1dq.fsf@pushface.org>
	<c6ace540-c022-49d7-b7f6-94405db70b23@googlegroups.com>
	<lywpsqfbll.fsf@pushface.org>
	<be9e6349-43e0-492c-ab44-f10ef747244b@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain
Injection-Info: mx02.eternal-september.org;
 posting-host="6f4ba2ce0f80cf6975f919f4f22c2ad9";
	logging-data="28665"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX19P773Jp+6kyT9FGIlHVzI4Nn0C99p16zQ="
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (darwin)
Cancel-Lock: sha1:GOKh74UvsYx3wplOSNYJwC0Y4gg=
	sha1:bUQw9By9jGWOuQ1WFKyAtwPbw8Q=
Xref: news.eternal-september.org comp.lang.ada:28694
Date: 2015-12-07T22:02:36+00:00
List-Id: <comp.lang.ada>

Jere <jere.groups@gmail.com> writes:

> This is something I should ask about: I am running pure bare metal.
> We won't have SD cards or hard drives.  Everything we do will need to
> run straight on the micro's Flash itself.  We may or may not have
> EEPROMs, but even if we do, we are talking 512K bits (64k bytes) of
> standard EEPROM (so too slow for general use ... 1-5ms write times).
> I am pretty sure there is a FreeRTOS port for my chip (I'll need to
> verify, but I am pretty sure).  Is there a configuration where I am
> able to use the FreeRTOS runtime you made in that context?  Does the
> runtime have all it needs to operate on a baremetal board or do I need
> to have FreeRTOS installed and running similar to windows or Linux
> with an SD card to hold the application executable?  In my ideal
> world, I would simply write an Ada program, compile it, and write it
> straight to the micro's Flash.  I am unsure if the runtime you
> proposed works in that manner or not.  The ravenscar profile based
> runtime provided by AdaCore appears to (I have not had to install an
> OS to use that cross compiler).
>
> That said, I am mostly familiar with straight up bare metal, so a zero
> foot print runtime (if I understand what that entails) would be fine
> as well and maybe preferable due to our timing constraints. I don't
> really need tasking.

My RTS definitely works in the bare-metal environment. However, I'd have
thought your board is on the small side? a fairly small demo used

   $ arm-eabi-size stairwell_arduino_demo
      text	   data	    bss	    dec	    hex	filename
    130716	   1992	  17152	 149860	  24964	stairwell_arduino_demo

If you're happy with zero footprint, check out
http://www.inspirel.com/articles/Ada_On_Cortex.html