+++ Bjørn Forsman [2011-03-03 12:56 +0100]: > Hi, > > 2011/3/3 Jean-Michel Pouré - GOOZE <[email protected]>: > > Hello, > > > > Which file system would you recommend for an Emdebian grib filesystem on > > Compact Flash? I would expect to see JFFS2 / YAFFS2 but it is not > > available from the Debian installer. > > AFAIK, Compact Flash emulates a block device so the pure flash-based > filesystems like JFFS2 and YAFFS2 doesn't make much sense. I think > it's better to use one of the non-flash filesystems, e.g. ext2/3/4, > for Compact Flash.
Correct. CF (or SD or MMC) is a block device interface for 'normal' disk filesystems (ext2/3/4/btrfs etc). I believe eMMC (which is soldered-down flash that behaves like an MMC card) also falls into this class. On-board flash, or Smartmedia (or xD I think) is raw flash that needs a flash filesystem JFFS2/YAFFS/UBIFS/(LOGFS) A long time ago (6 years?) I had very bad experiences with ext3 and CF (wear-levelling/ad-block management was at the front of the device, where the FAT goes, not at the end where the ext3 journal goes, so a few boots could kill the device). Controllers have improved so this is not a problem anymore, but they are still all designed for FAT and thus work less well to varying degrees and in varying ways with other filesystems. Simple-minded filesystems may well work better than clever ones, depending on the details of their operation. Wookey -- Principal hats: Linaro, Emdebian, Wookware, Balloonboard, ARM http://wookware.org/ -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
