From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pw0-f43.google.com (mail-pw0-f43.google.com [209.85.160.43]) by ozlabs.org (Postfix) with ESMTP id 123301007D1 for ; Mon, 25 Jan 2010 15:09:34 +1100 (EST) Received: by pwj11 with SMTP id 11so2210556pwj.2 for ; Sun, 24 Jan 2010 20:09:32 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <2ea1731b1001220014v59ea7767m6e1a8547d41c6afb@mail.gmail.com> References: <20100119102026.GF16182@darwin> <20100119140600.GH16182@darwin> <2ea1731b1001192357r72d627e2gb36d71f23fd69b2e@mail.gmail.com> <2ea1731b1001220014v59ea7767m6e1a8547d41c6afb@mail.gmail.com> Date: Mon, 25 Jan 2010 12:09:32 +0800 Message-ID: Subject: Re: mount ramdisk rootfs /etc directory to jffs2 filesystem. From: Johnny Hung To: Marco Stornelli Content-Type: text/plain; charset=ISO-8859-1 Cc: Ricard Wanderlof , "linux-embedded@vger.kernel.org" , kernelnewbies , "linux-mtd@lists.infradead.org" , Matthias Kaehlcke , "linuxppc-dev@lists.ozlabs.org" List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 2010/1/22 Marco Stornelli : > 2010/1/22 Johnny Hung : >> 2010/1/20 Marco Stornelli : >>> 2010/1/20 Johnny Hung : >>>> 2010/1/19 Matthias Kaehlcke : >>>>> El Tue, Jan 19, 2010 at 02:17:22PM +0100 Ricard Wanderlof ha dit: >>>>> >>>> I consider to use ramdisk as rootfs because worry about wrong >>>> operation in rootfs (is use jffs2 rootfs) and it will cause system >>>> boot up failed. >>>> Another query, does the syslogd/klogd log files also store in jffs2 >>>> rootfs? Write to jffs2 frequently will reduce flash life cycle. >>>> >>>> BRs, H. Johnny >>>>> >>>>> -- >>> >> >> It seems there are a lot of file-systems I have to study :P. The same >> question is >> how to split my rootfs? Re-mount /etc, /var to another file-sysyem mtd part when >> system boot up? >> > Yes, I know. So if I want set etc directoyr to /dev/mtd5 not in rootfs /, I need to add "/dev/mtdblock5 /etc jffs2 defaults 0 0" in /etc/fstab file but rootfs doesn't contain /etc directory because /etc directoyr is store in /dev/mtdblock5. Do you know what I mean? The kernel execute /sbin/init after mount rootfs and /sbin/init is link to busybox, busybox will read /etc/inittab file to initial. The problem is coming, how busybox to read /etc in rootfs before mount /dev/mtdblock5 to /etc? There is no program to mount /dev/mtdblock5 to /etc before busybox init execute. I think I must mistake some concept, please give me a hint. Thank you BRs, H. Johnny > Simply, you can mount each mount point with the fstab file and a > script, same approach of every linux distribution, nothing more. Even > in the pc world you can mount your /home on a partition with ext3, > /var in a partition with ext4, and so on. A very simple approach to > setup the system, it is to start with NFS for example with "whole" fs, > copy what you need in the right place, setup the start-up script and > reboot. > > Marco >