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 1W1X10-0002a3-M4 for barebox@lists.infradead.org; Fri, 10 Jan 2014 08:00:27 +0000 Date: Fri, 10 Jan 2014 09:00:04 +0100 From: Sascha Hauer Message-ID: <20140110080004.GS6750@pengutronix.de> References: <20131212080359.GE24559@pengutronix.de> <20131212195806.GL24559@pengutronix.de> <20131219080917.GW24559@pengutronix.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: 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: Porting barebox (devicetree) to Variscite iMX6 SOM To: Michael Burkey Cc: barebox@lists.infradead.org On Thu, Jan 09, 2014 at 02:59:33PM -0500, Michael Burkey wrote: > Sascha, > > Since I am still having issues with the kernel booting -- and needed a > bit of a break to clear my mind -- I decided to delve into the initial > barebox bootup from NAND a bit more. > > Correct me if I am wrong, but how I understand things right now... > > The iMX6 requires a BCB header prior to the actual barebox partition > (e.g. nand0.bootstream). This bootstream partition would contain the > BCB data specific to the iMX6 (i.e. an FCB and at least a partial > DBBT). Yes, right. > > It also looks like this functionality is already present in barebox > for the MX23/28 series of parts (i.e. the "bcb" command). Yes. > > I also have the source for kobs-ng v1.3, which does properly generate > the BCB for the MX6 series (and is what I am currently using to flash > barebox into NAND). Yes, kobs works for me aswell on i.MX6 > > So, basically, it sounds like what I need to do is migrate the bcb.c > file from the arm/mach-mxs folder into the MX6 portion of the tree and > then update it based on the datasheet and the "known good" parameters > from kobs-ng v1.3 (which look fairly similar to the definitions you > already have in place for the MX23/28 FCB). > > Does this sound like a reasonable plan of action? Indeed. I tried Doing that myself, but it didn't work, probably some little piece was missing. I also started to port the original kobs code to barebox, but was distracted. I can give you the code I have so far if you like. > > It really looks like life with the iMX6 would be much easier if I had > a SPI-NOR on this SOM, instead of NAND only. Yeah, indeed. I usually recommend our customers to not rely on NAND for booting. 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