jffs2 on ubi volume

jffs2 on ubi volume

[Manoj]

Hi,

I would like to use JFFS2 on top of UBI. I have enabled
CONFIG_MTD_UBI_GLUEBI in kernel config.

I have been able to create an empty FS by doing:
> modprobe ubi mtd=1
> ubimkvol /dev/ubi0 -s 25MiB -N ubivol1
> mount -t jffs2  /dev/mtdb-nvdata /tmp/flash

I can read and write files to /tmp/flash.

How do I write a jffs2 filesystem image to a ubi volume? I tried
ubiupdatevol but I think I am not passing the right parameters.
Do I need to use ubinize to create the UBI image that can be then
programmed to the UBI volume?

Thanks for any help.

Re: jffs2 on ubi volume

[Manoj]

Answering my own question, I got it to work by creating a /dev/ubi0_1
device file and then using ubiupdatevol.

>./ubimkvol /dev/ubi0 -s25MiB -Nubivol1 -n1
> mknod /dev/ubi0_1 c 253 2
> ./ubiupdatevol /dev/ubi0_1 sum.jffs2.rootfs
> mkdir /tmp/flash
> mount -t jffs2 /dev/mtdb-nvdata /tmp/flash




On Mon, Jun 22, 2009 at 7:18 PM, Manoj<manoj23@gmail.com> wrote:
> Hi,
>
> I would like to use JFFS2 on top of UBI. I have enabled
> CONFIG_MTD_UBI_GLUEBI in kernel config.
>
> I have been able to create an empty FS by doing:
>> modprobe ubi mtd=1
>> ubimkvol /dev/ubi0 -s 25MiB -N ubivol1
>> mount -t jffs2  /dev/mtdb-nvdata /tmp/flash
>
> I can read and write files to /tmp/flash.
>
> How do I write a jffs2 filesystem image to a ubi volume? I tried
> ubiupdatevol but I think I am not passing the right parameters.
> Do I need to use ubinize to create the UBI image that can be then
> programmed to the UBI volume?
>
> Thanks for any help.
>

jffs2 on ubi volume

[Thang Dao Duy]

manoj23@gmail.com wrote:

>Answering my own question, I got it to work by creating a /dev/ubi0_1
>device file and then using ubiupdatevol.

>>./ubimkvol /dev/ubi0 -s25MiB -Nubivol1 -n1
>> mknod /dev/ubi0_1 c 253 2
>> ./ubiupdatevol /dev/ubi0_1 sum.jffs2.rootfs
>> mkdir /tmp/flash


Command ubimkvol will create a device /dev/ubi0_1, so "mknod
/dev/ubi0_1 c 253 2" may be unnecessary.

manoj23@gmail.com wrote:

>> mount -t jffs2 /dev/mtdb-nvdata /tmp/flash

jffs2 file system does not work on UBI API, it works on MTD API. so we
cannot mount jffs2 on ubi volume. We can use ubifs on ubi volume:

mount -t ubifs ubi0_1 /mnt/

Re: jffs2 on ubi volume

[Artem Bityutskiy]

On Fri, 2009-06-26 at 13:20 +0700, Thang Dao Duy wrote:
> manoj23@gmail.com wrote:
> 
> >Answering my own question, I got it to work by creating a /dev/ubi0_1
> >device file and then using ubiupdatevol.
> 
> >>./ubimkvol /dev/ubi0 -s25MiB -Nubivol1 -n1
> >> mknod /dev/ubi0_1 c 253 2
> >> ./ubiupdatevol /dev/ubi0_1 sum.jffs2.rootfs
> >> mkdir /tmp/flash
> 
> 
> Command ubimkvol will create a device /dev/ubi0_1, so "mknod
> /dev/ubi0_1 c 253 2" may be unnecessary.

No, not really. Udev will do this, not ubimkvol. And if you do not
have udev, the device node will not be created. But may be it would
be a good idea to teach ubimkvol doing this.
> manoj23@gmail.com wrote:
> 
> >> mount -t jffs2 /dev/mtdb-nvdata /tmp/flash
> 
> jffs2 file system does not work on UBI API, it works on MTD API. so we
> cannot mount jffs2 on ubi volume. We can use ubifs on ubi volume:
> 
> mount -t ubifs ubi0_1 /mnt/

Right, but you still may use jffs2 with ubi. We have the gluebi emulator
for this:

http://www.linux-mtd.infradead.org/faq/ubi.html#L_run_jffs2

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)