> > Hi All, > > I have a customized MPC8313 (ppc arch) board with SPANSION 64MB NOR > flash, everything works fine but I found a abnormal about JFFS2 flahs > filesystem. > > The system will mount JFFS2 to /mnt/mtd when system boot up. I try to > execute umount /mnt/mtd or sync or reboot right away after login then > these commands hangs. Use ps command to check process status and is D > (Uninterruptible sleep, usually IO). I try to kill jffs2_gcd_mtd4 and > umount/reboot/syc commands execute successfully. I think > jffs2_gcd_mtd4 (mount /dev/mtd4) do something in the background so I > wait for 10 minutes after login and execute the same commands and it > doesn't hangs. > > The following procedure is I to make jffs2 file system and write to > flash then mount to /mnt/mtd. > > 1. mkfs.jffs2 -d mtd -e 0x20000 --pad 0x3080000 -o mtd.jffs2 (erase > block size is 128KB and jffs2 partition size is 48.5MB) > > 2. write jffs2 file system to flash in uboot. > tftpboot 200000 mtd.jffs2; (load mtd.jffs2 to memory) > protect off f8f80000 fbffffff; > erase f8f80000 fbffffff; (erase all 48.5MB) > cp.b 200000 f8f80000 $filesize; (program mtd.jffs2 to flash) > protect on f8f80000 fbffffff; > cmp.b 200000 f8f80000 $filesize > > 3. Add below in /etc/fstab file to mount to /mnt/mtd > /dev/mtdblock4 /mnt/mtd jffs2 defaults 1 1 > > Does anyone knows what purpose for jffs2_gcd_mtdx thread and why it > cause umount/sync/reboot commands hangs it is reasonable or something > I did wrong? I guess this is the first reboot after mounting a new JFFS2 FS? Then JFFS2 is reerasing empty blocks and you will have to wait until it is done. I posted a patch long ago for this, but it was racy w.r.t JFSS2 module unload so it didn't make it into the repo. Search the list for "[JFFS2] Stop erasing blocks when rebooting." to find my old patch Jocke -- 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
