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?
BRs, H. Johnny
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