From: Badreddine <baroudi.badreddine@gmail.com>
To: ecos-discuss@ecos.sourceware.org
Subject: [ECOS] Re: Different section placement for kernel and application
Date: Mon, 19 May 2014 09:45:00 -0000 [thread overview]
Message-ID: <loom.20140519T113423-271@post.gmane.org> (raw)
In-Reply-To: <2029563421.8440.1296480614291.JavaMail.root@idefix>
Martin Rösch <martin.roesch <at> neratec.com> writes:
>
> Hi,
>
> On 2011-01-28, Grant Edwards <grant.b.edwards <at> gmail.com> wrote:
> > I'm curious why you want to do this. What benefit does it provide?
>
> I have to link a C++ Application to eCos (with FreeBSD Stack and uSTL) on
a STM32 derived board.
> The footprint is to big to run it from the internal flash. So we decided
to run it from external RAM.
> Unfortunately the performance regarding IRQ handling of a RAM Application
is too bad:
> Using the timers test from the STM32 variant HAL, I've set only TIM1
active and then varied the update
> interrupt period. It turned out, that with a period of 20msec. the IRQ
handler run into an Assertion in
> the post_dsr() function:
> ASSERT FAIL: <5>intr.cxx[292]void Cyg_Interrupt::post_dsr() DSR list is
not empty but its head is 0
>
> Doing the same test with a ROM Application, the period can be lowered to
50usec.
>
> So I'm trying to move the eCos library that contains the ISRs, DSRs etc.
to the Internal Flash while keeping
> the rest of the application (that has no ISRs and DSRs) still in the
external RAM.
>
> I hope this Setup will improve the IRQ handling.
>
> Greetings,
>
> Martin
>
Hi Martin,
I am about to start a new project using ecos (need to posix os with tcp/ip
stack) and I want to know roughly the footprint of the os.
Do you know how much does ecos with tcp/ip stack consume?
Thanks,
Badreddine
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prev parent reply other threads:[~2014-05-19 9:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2815371.163.1296147619546.JavaMail.neratec@martin-lucid32>
2011-01-27 17:56 ` [ECOS] " Martin Rösch
2011-01-27 18:24 ` Christophe Coutand
2011-01-27 22:01 ` [ECOS] " Grant Edwards
2011-01-28 16:19 ` Martin Rösch
2011-01-28 16:25 ` Grant Edwards
2011-01-28 17:07 ` Grant Edwards
2011-01-30 9:31 ` Martin Rösch
[not found] ` <2029563421.8440.1296480614291.JavaMail.root@idefix>
2014-05-19 9:45 ` Badreddine [this message]
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