From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Voano-0003v3-S8 for barebox@lists.infradead.org; Thu, 05 Dec 2013 15:25:21 +0000 Date: Thu, 5 Dec 2013 16:24:57 +0100 From: Sascha Hauer Message-ID: <20131205152456.GT24559@pengutronix.de> References: <20131127130236.GX24559@pengutronix.de> <20131127210115.GZ24559@pengutronix.de> <20131128162219.GT32436@tarshish> <20131129094623.GB24559@pengutronix.de> <20131203092654.GH24559@pengutronix.de> <20131203190126.GD27628@ns203013.ovh.net> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20131203190126.GD27628@ns203013.ovh.net> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: FW: Barebox on Karo TX25 To: Jean-Christophe PLAGNIOL-VILLARD Cc: "barebox@lists.infradead.org" On Tue, Dec 03, 2013 at 08:01:26PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote: > On 10:26 Tue 03 Dec , Sascha Hauer wrote: > > BTW Please don't top-post. > > > > On Mon, Dec 02, 2013 at 09:13:31AM +0000, John Parker wrote: > > > Hi again > > > > > > So now my problem is that I really could do with the LED and UBIFS stuff that happened since February. > > > > > > Should I try to fix mx25 in the latest code, or undo the problematic commit? > > > > Well preferably you should fix the latest code and send a patch to make > > it work again ;) However, that could become tricky. For doing so the > > patch to enable the debug UART early may become useful. With this you > > can use putc_ll and puthex_ll in early code. > > > > I did some investigation. What happens here is really strange. First I > > added a missing instruction cache invalidation. That alone doesn't fix > > the problem. Inserting a nop fixes booting for me, see the attached > > patch. If I move the nop up in the code it still works. If I move it > > down, then the board does not work. I have no idea what's happening here > > :( > > could be that the sdram controler need times to stabelized and that you miss a > delay for this I thought about this aswell, but I don't believe that a single nop could make such a reproducable difference. I tried all this with JTAG debugging aswell which should make all timing issues vanish. Sascha -- 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