2010/1/19 Matthias Kaehlcke <matthias@xxxxxxxxxxxx>: > El Tue, Jan 19, 2010 at 02:17:22PM +0100 Ricard Wanderlof ha dit: > >> On Tue, 19 Jan 2010, Johnny Hung wrote: >> >>> Okay, I think the steps is below if my rootfs is ramdisk and configure >>> files in jffs2, >>> >>> 1. cp /etc/* /mnt/mtd/etc/ (/mnt/mtd is my jffs2 fs) >>> 2. rm -rf /etc/* >>> 3. make symbolic links from all /etc/xx to /mnt/mtd/etc/xxx >>> 4. remake ramdisk rootfs >>> >>> It seems all files in ramdisk rootfs /etc all links to /mnt/mtd/etc/ >>> and try to modify these files is effective after reboot. >>> But is this a common way in embedded linux ? >> Thanks, I understand. >> In principle, but it is easier (and cleaner) to make a symbolic link from >> (say) /etc -> /mnt/mtd/etc without linking every individual file and >> directory. > > i totally agree with ricard when you want to move the entire directory > to jffs2 and not only some selected files > >> You could also use a jffs2 file system in flash for your rootfs, that way >> you wouldn't need a ramdisk at all. > > i'd also recommend you to consider if you really need the > ramdisk. when using a ram disk its entire content is loaded to the RAM > occupying space, even if you don't use certain files (or part of > them). other filesystems are more efficient in this aspect. > if the main purpose is to have a read only rootfs, i'd suggest a look > at squashfs. 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 > > -- > Matthias Kaehlcke > Embedded Linux Developer > Barcelona > > La posibilidad de realizar un suenyo es lo > que hace que la vida sea interesante > .''`. > using free software / Debian GNU/Linux | http://debian.org : :' : > `. `'` > gpg --keyserver pgp.mit.edu --recv-keys 47D8E5D4 `- > -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
