From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from vms173005pub.verizon.net (vms173005pub.verizon.net [206.46.173.5]) by yocto-www.yoctoproject.org (Postfix) with ESMTP id 824D6E013E0 for ; Thu, 27 Oct 2011 14:39:24 -0700 (PDT) Received: from gandalf.denix.org ([unknown] [96.240.135.93]) by vms173005.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0LTQ00ABXUTD6IS5@vms173005.mailsrvcs.net> for meta-ti@yoctoproject.org; Thu, 27 Oct 2011 16:39:13 -0500 (CDT) Received: by gandalf.denix.org (Postfix, from userid 1000) id DF39914AF5D; Thu, 27 Oct 2011 17:39:12 -0400 (EDT) Date: Thu, 27 Oct 2011 17:39:12 -0400 From: Denys Dmytriyenko To: Jason Kridner Message-id: <20111027213912.GO15391@denix.org> References: <1319679361-13741-1-git-send-email-jdk@ti.com> MIME-version: 1.0 In-reply-to: <1319679361-13741-1-git-send-email-jdk@ti.com> User-Agent: Mutt/1.5.16 (2007-06-09) Cc: meta-ti@yoctoproject.org Subject: Re: [PATCH] sdcard_image: align partitions with flash pages X-BeenThere: meta-ti@yoctoproject.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Mailing list for the meta-ti layer List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Oct 2011 21:39:25 -0000 Content-type: text/plain; charset=us-ascii Content-disposition: inline On Wed, Oct 26, 2011 at 09:36:01PM -0400, Jason Kridner wrote: > See > http://sakoman.com/OMAP/a-script-for-partitioningformatting-a-bootable-sdmicrosd-card.html If I was Paul Menzel, I'd complain about non-descriptive description :) Here's what I gathered from the above URL, which just gives the new script: # Modifications to align partitioning by Steve Sakoman # based on work by Arnd Bergmann # Align partitions for SD card performance/wear optimization # FAT partition size is 131072 sectors (64MB) less: # MBR - 1 sector # padding to align to the page size of the underlying flash - 127 sectors # so we start the first partition at sector 128 and make it 131072 - 128 = 130944 sectors # second partition starts at 131072 and continues to fill the card It would be nice to have that in the commit message just to explain the simingly random change of numbers below... :) BTW, Arnd Bergmann is the expert in SD card wear issues http://lwn.net/Articles/428584/ and, if I remember correctly, he was showing some tests abusing whole bunch of SD cards at the last ELC. -- Denys > Signed-off-by: Jason Kridner > --- > classes/sdcard_image.bbclass | 6 +++--- > 1 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/classes/sdcard_image.bbclass b/classes/sdcard_image.bbclass > index 4ebc998..9e4a959 100644 > --- a/classes/sdcard_image.bbclass > +++ b/classes/sdcard_image.bbclass > @@ -46,9 +46,9 @@ IMAGE_CMD_sdimg () { > SIZE=$(/sbin/fdisk -l ${LOOPDEV} | grep Disk | grep bytes | awk '{print $5}') > CYLINDERS=$(echo $SIZE/255/63/512 | bc) > { > - echo ,9,0x0C,* > - echo ,,,- > - } | /sbin/sfdisk -D -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV} > + echo 128,130944,0x0C,* > + echo 131072,,,- > + } | /sbin/sfdisk -D -uS -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV} > > # Prepare loop devices for boot and filesystem partitions > BOOT_OFFSET=32256 > -- > 1.7.4.1 > > _______________________________________________ > meta-ti mailing list > meta-ti@yoctoproject.org > https://lists.yoctoproject.org/listinfo/meta-ti >