OneNAND: Unexpected zero blocks

OneNAND: Unexpected zero blocks

[Julianne C.]

In using the 2.6.20 kernel with onenand enabled and active we:

1) see the partitions setup in the kernel boot messages

2) can mount a partition:  mount -t jffs2 /dev/mtdblock3 /mnt

3) copy the rootfs (about 2 MB) to the new fs on /mnt

When the fs is unmounted, and remounted again, we see some files in which
two to four blocks of zeros occur (0x2000), or blocks with some
initial data filled
in 20 to 40 bytes and the rest zeros.

Is this a known problem with the onenand parts or the driver?

Where can one obtain a copy of the latest driver
   (without having to use git since we can't access git archives
behind our firewall)

(The board is a LogicPD  PXA270 with one 64 MB Samsung device - used for both
boot and OS file systems.)

Re: OneNAND: Unexpected zero blocks

[Adrian Hunter]

ext Julianne C. wrote:
> Is this a known problem with the onenand parts or the driver?

Not one that I know of.

> Where can one obtain a copy of the latest driver
>    (without having to use git since we can't access git archives
> behind our firewall)

I guess you could grab the files from gitweb:

http://git.infradead.org/?p=users/kmpark/onenand-mtd-2.6.git

Look in the tree at drivers/mtd/onenand

RE: OneNAND: Unexpected zero blocks

[Kyungmin Park]

Hi,

> 
> 3) copy the rootfs (about 2 MB) to the new fs on /mnt
> 
> When the fs is unmounted, and remounted again, we see some 
> files in which two to four blocks of zeros occur (0x2000), or 
> blocks with some initial data filled in 20 to 40 bytes and 
> the rest zeros.

Umm, I  have no idea.

please use this script. In my board, it is passed both kernel
1. omap tree
2. onenand mtd tree

# note you have to add onenand partition to /etc/fstab
e.g., 
/dev/mtdblock4  /jffs2          jffs2   defaults                1       1

#!/bin/sh -x

DIRS="usr etc bin lib"

for dir in $DIRS; do
        echo "Testing $dir ..."
        time mount /jffs2
        rm -rf /jffs2/*
        mkdir -p /jffs2/$dir
        cp -ar /$dir/* /jffs2/$dir
        diff -Nur /$dir /jffs2/$dir
        umount /jffs2

        time mount /jffs2
        diff -Nur /$dir /jffs2/$dir
        umount /jffs2
done

Thank you,
Kyungmin Park