problem using jffs2 on DiskOnChip

problem using jffs2 on DiskOnChip

[Carl Wolff]

Hello,

I've got a problem with jffs2. I'm using a DiskOnChip module type milennium.

Do I need NFTL support?
I've managed to copy a jffs2 image onto the diskonchip using cp image
/dev/mtd/0.

When I copy the contents of the device to a file using cat /dev/mtd/0 >
testfile and I compare this file with the file just copied to the device,
they are the same, the latter is bigger, because padded with FF's

when I do a mount -t jffs2 /dev/mtd/0 /mnt I get the following output:


# mount -t jffs2 /dev/mtdblock/0 /mnt
mtdblock_open
ok
Short read: 0x10 bytes at 0x000001f0 instead of requested 44
mtdblock_release
ok
mount: Mounting /dev/mtdblock/0 on /mnt failed: Invalid argument
#

What do I wrong?


I use a 2.4.17 kernel with following version details
NFTL driver: nftlcore.c $Revision: 1.85 $, nftlmount.c $Revision: 1.25 $
Flash chip found: Manufacturer ID: 98, Chip ID: E6 (Toshiba TC58V64AFT/DC)
# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00800000 00002000 "DiskOnChip Millennium"
#

Thanks for any help
Carl.

Re: problem using jffs2 on DiskOnChip

[Russ Dill]

On Wed, 2002-12-18 at 12:03, Carl Wolff wrote:
> Hello,
> 
> I've got a problem with jffs2. I'm using a DiskOnChip module type milennium.
> 
> Do I need NFTL support?
> I've managed to copy a jffs2 image onto the diskonchip using cp image
> /dev/mtd/0.

eraseall /dev/mtd/0

-- 
Russ Dill <Russ.Dill@asu.edu>

RE: problem using jffs2 on DiskOnChip

[Carl Wolff]

> -----Original Message-----
> From: linux-mtd-admin@lists.infradead.org
> [mailto:linux-mtd-admin@lists.infradead.org]On Behalf Of Russ Dill
> Sent: woensdag 18 december 2002 20:14
> To: wolff@turnkiek.nl
> Cc: linux-mtd@lists.infradead.org
> Subject: Re: problem using jffs2 on DiskOnChip
>
>
> On Wed, 2002-12-18 at 12:03, Carl Wolff wrote:
> > Hello,
> >
> > I've got a problem with jffs2. I'm using a DiskOnChip
> module type milennium.
> >
> > Do I need NFTL support?
> > I've managed to copy a jffs2 image onto the diskonchip
> using cp image
> > /dev/mtd/0.
>
> eraseall /dev/mtd/0

I did it. I checked the contents after the eraseall and saw only FF's.
Then I copied the image and verified the contents of the device with the
orginial file: they are the same.
So I think the data is correctly put into the flash....

>
> --
> Russ Dill <Russ.Dill@asu.edu>
>
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
>

Re: problem using jffs2 on DiskOnChip

[David Woodhouse]

wolff@turnkiek.nl said:
> Short read: 0x10 bytes at 0x000001f0 instead of requested 44 

The DiskOnChip hardware driver hasn't been used much with anything other 
than NFTL. It appears not to do a full read if you ask it to read a range 
of data which crosses a page boundary. Fix it accordingly by putting an 
appropriate loop in instead of...

        /* Don't allow a single read to cross a 512-byte block boundary */
        if (from + len > ((from | 0x1ff) + 1))
                len = ((from | 0x1ff) + 1) - from;

--
dwmw2

RE: problem using jffs2 on DiskOnChip

[Carl Wolff]

Hello David,

OK. Two questions:
1) Does JFFS2 actually work on a DiskOnChip?
2) Other alternatives? We need a powersafe filesystem on DiskOnChip.


Thanks, and happy newyear, I'm going on holiday now.

Carl.


> -----Original Message-----
> From: David Woodhouse [mailto:dwmw2@redhat.com]On Behalf Of David
> Woodhouse
> Sent: donderdag 19 december 2002 11:14
> To: wolff@turnkiek.nl
> Cc: linux-mtd@lists.infradead.org
> Subject: Re: problem using jffs2 on DiskOnChip 
> 
> 
> 
> wolff@turnkiek.nl said:
> > Short read: 0x10 bytes at 0x000001f0 instead of requested 44 
> 
> The DiskOnChip hardware driver hasn't been used much with 
> anything other 
> than NFTL. It appears not to do a full read if you ask it to 
> read a range 
> of data which crosses a page boundary. Fix it accordingly by 
> putting an 
> appropriate loop in instead of...
> 
>         /* Don't allow a single read to cross a 512-byte 
> block boundary */
>         if (from + len > ((from | 0x1ff) + 1))
>                 len = ((from | 0x1ff) + 1) - from;
> 
> --
> dwmw2
> 
> 
> 

Re: problem using jffs2 on DiskOnChip

[Brian Austin]

On Thursday 19 December 2002 09:29, Carl Wolff wrote:

use ext3 instead.  Depending onhow big your chip is.
or reiserfs


> Hello David,
>
> OK. Two questions:
> 1) Does JFFS2 actually work on a DiskOnChip?
> 2) Other alternatives? We need a powersafe filesystem on DiskOnChip.
>
>
> Thanks, and happy newyear, I'm going on holiday now.
>
> Carl.
>
> > -----Original Message-----
> > From: David Woodhouse [mailto:dwmw2@redhat.com]On Behalf Of David
> > Woodhouse
> > Sent: donderdag 19 december 2002 11:14
> > To: wolff@turnkiek.nl
> > Cc: linux-mtd@lists.infradead.org
> > Subject: Re: problem using jffs2 on DiskOnChip
> >
> > wolff@turnkiek.nl said:
> > > Short read: 0x10 bytes at 0x000001f0 instead of requested 44
> >
> > The DiskOnChip hardware driver hasn't been used much with
> > anything other
> > than NFTL. It appears not to do a full read if you ask it to
> > read a range
> > of data which crosses a page boundary. Fix it accordingly by
> > putting an
> > appropriate loop in instead of...
> >
> >         /* Don't allow a single read to cross a 512-byte
> > block boundary */
> >         if (from + len > ((from | 0x1ff) + 1))
> >                 len = ((from | 0x1ff) + 1) - from;
> >
> > --
> > dwmw2
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/