From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dKgEw-0000Nw-TO for barebox@lists.infradead.org; Tue, 13 Jun 2017 07:27:53 +0000 Date: Tue, 13 Jun 2017 09:27:29 +0200 From: Sascha Hauer Message-ID: <20170613072729.gx63q5adesl67tmf@pengutronix.de> References: <1496947297-23502-1-git-send-email-akurz@blala.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1496947297-23502-1-git-send-email-akurz@blala.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [PATCH 1/4] ARM: i.MX6 Wandboard: dont do MMDC Write Leveling Calibration To: Alexander Kurz Cc: barebox@lists.infradead.org On Thu, Jun 08, 2017 at 08:41:34PM +0200, Alexander Kurz wrote: > The hardware requirements to perform a write leveling calibration are > not fulfilled by the Wandboard modules. > IMX6DQRM =A744.11.6 "Write leveling Calibration" Note2 states that the fi= rst > bit of each data byte group (D0, D8, ..., D56) from memory must be connec= ted > to the same data bus bit on the controller, which is not given on the > Wandboard modules, resulting in unpredictable calib results and breaking = the > WBQUAD 2GiB SDRAM setup. Similar restrictions exist for the i.MX6SD. > = > Remove this calibration and use the MPWLDECTRL defaults. > = > Signed-off-by: Alexander Kurz Applied, thanks Sascha > --- > arch/arm/boards/technexion-wandboard/lowlevel.c | 1 - > 1 file changed, 1 deletion(-) > = > diff --git a/arch/arm/boards/technexion-wandboard/lowlevel.c b/arch/arm/b= oards/technexion-wandboard/lowlevel.c > index d3eb9a0..ff5ae6d 100644 > --- a/arch/arm/boards/technexion-wandboard/lowlevel.c > +++ b/arch/arm/boards/technexion-wandboard/lowlevel.c > @@ -276,7 +276,6 @@ static unsigned long wandboard_dram_init(void) > = > __udelay(100); > = > - mmdc_do_write_level_calibration(); > mmdc_do_dqs_calibration(); > #ifdef DEBUG > mmdc_print_calibration_results(); > -- = > 2.1.4 > = > = > _______________________________________________ > barebox mailing list > barebox@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/barebox -- = Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox