From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <512BE5A2.3090505@xenomai.org>
Date: Mon, 25 Feb 2013 23:28:50 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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References: <512BFD9E.5010501@crubille.lautre.net>
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Subject: Re: [Xenomai] Linux port to ARM Allwinner A13
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To: Paul <paul@crubille.lautre.net>
Cc: xenomai@xenomai.org

On 02/26/2013 01:11 AM, Paul wrote:

>=20
> Here is a first port for OLINUXINO A13 board.
>=20
> http://www.crubille.lautre.net/xenomai_sun5i/ipipe-linuxsun5i-3.4.24.be=
ta.patch
>=20
> and apply the standart xenomai-2.6.2.1 procedure on a sunxi linux kerne=
l=20
> from :
> "git clone git://github.com/linux-sunxi/linux-sunxi.git -b sunxi-3.4"


Hi,

good news the I-pipe patch for ARM is ported to yet another board! If
you wish the patch to be distributed with Xenomai, please generate a
-pre and -post patches.

If you generate pre and post patches, we can update the I-pipe patch
with your pre and post patches remaining valid. If you do otherwise,
your patch will bitrot fast.

Since I have been talking about it so many times, I guess we should
provide a script to generate the -pre and -post patches.

>=20
> I think that the A10/A13 port in the official linux tree is still too=20
> unstable to port on it.
>=20
>=20
> The patch is a basic but functionnal version. I attempt to use priority=
=20
> interrupt, but go in trouble.
> If i can have comments about this point?


Probably not much more than what you can find in the porting guide.

>=20
> If somebody is interested in it for A10, it is very easy to adapt, and =
i=20
> can do it and send the patch.
>=20
> Paul Crubill=C3=A9
>=20
> -----------------------------------------------------------------------=
----------------------------
>=20
> Running it, i get
>=20
>=20
> latency -t 2 -p 100
> =3D=3D Sampling period: 100 us
> =3D=3D Test mode: in-kernel timer handler
> =3D=3D All results in microseconds
> RTT|  00:00:01  (in-kernel timer handler, 100 us period, priority 99)
> RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat=20
> best|--lat worst
> RTD|      5.583|      6.265|     11.167|       0|     0|      5.583|   =
=20
>   11.167
> RTD|      6.125|      6.258|     10.917|       0|     0|      5.583|   =
=20
>   11.167
> RTD|      5.500|      6.270|     12.000|       0|     0|      5.500|   =
=20
>   12.000
>=20
>=20
> "lat worst" is mostly under 20 us but can go up for 30 ns.
>=20
> latency  -p 100
> =3D=3D Sampling period: 100 us
> =3D=3D Test mode: periodic user-mode task
> =3D=3D All results in microseconds
> warming up...
> RTT|  00:00:01  (periodic user-mode task, 100 us period, priority 99)
> RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat=20
> best|--lat worst
> RTD|     11.999|     12.708|     21.333|       0|     0|     11.999|   =
=20
>   21.333
> RTD|     12.624|     12.791|     21.541|       0|     0|     11.999|   =
=20
>   21.541
> RTD|     12.458|     12.791|     26.458|       0|     0|     11.999|   =
=20
>   26.458
>=20
> "lat worst" is mostly under 40 us but can go up for 80 ns.


Tests done without load are meaningless, try xeno-test or dohell.

--=20
                                                                Gilles.