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Date: Fri, 07 Mar 2008 12:39:46 -0800
Subject: Re: Creating an Empty JFFS2 File System
From: Grant Erickson <gerickson@nuovations.com>
To: Josh Boyer <jwboyer@gmail.com>
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On 3/7/08 10:37 AM, Josh Boyer wrote:
> On Fri, 07 Mar 2008 09:55:13 -0800
> Grant Erickson <gerickson@nuovations.com> wrote:
>> Is creating an empty JFFS2 file system supported or is this a deprecated
>> capability? The following steps seem to be incorrect or failing:
>> 
>>     # flash_eraseall -q -j /dev/mtd9
>>     # mount -t jffs2 /dev/mtdblock9 /mnt
>>     Cowardly refusing to erase blocks on filesystem with no valid JFFS2
>>     nodes
>>     empty_blocks 0, bad_blocks 0, c->nr_blocks 3840
>> 
>> Or, is the only way to accomplish this to create a NULL JFFS2 image with
>> mkfs.jffs2 and then nandwrite it?
> 
> Just erase it completely without the -j option and mount.  JFFS2 will go
> through and erase them all again and add the cleanmarkers itself.

Josh:

That technique is a no-go as well:

    # flash_eraseall -q /dev/mtd8
    # mount -t jffs2 /dev/mtdblock8 /mnt
    Cowardly refusing to erase blocks on filesystem with no valid JFFS2
    nodes
    empty_blocks 0, bad_blocks 0, c->nr_blocks 3840
    mount: mounting /dev/mtdblock8 on /mnt failed: Input/output error

Regards,

Grant