how to mount a 256 MB jffs2 image (without using 256 MB of RAM)?

how to mount a 256 MB jffs2 image (without using 256 MB of RAM)?

[Tomasz Chmielewski]

I just began to play with jffs2.

I have a small ASUS router which has a 4 MB flash, and 32 MB of RAM. It 
runs linux (http://www.openwrt.org).

4 MB flash is not much for a Linux distribution, but this tiny router 
has also a USB port, so I can connect a USB stick to it.

My original idea was to "format" this 256 MB USB stick with jffs2 to get 
more space - but of course, it's not possible, as it's not really a 
mtd/flash device.

So my second though was to create a ~256 MB jffs2 image on my Linux PC, 
copy it to the USB stick (formatted with ext2/3), and mount this image 
on a router.

I made some test, and unfortunately, it seems that to mount a 256 MB 
jffs image one needs an equal amount of RAM (256):


insmod mtdram total_size=262144 erase_size=256


Are there any alternative ways to mount a jffs2 image, so that it 
doesn't take so much RAM?


-- 
Tomasz Chmielewski
http://wpkg.org

Re: how to mount a 256 MB jffs2 image (without using 256 MB of RAM)?

[Jeff Angielski]

On Fri, 2006-01-13 at 12:46 +0100, Tomasz Chmielewski wrote:
> Are there any alternative ways to mount a jffs2 image, so that it 
> doesn't take so much RAM?

You might want to take a look at this under "Procedure":

http://www.handhelds.org/moin/moin.cgi/FamiliarBackupHowto

Google is your friend....  :)

Jeff Angielski
The PTR Group

Re: how to mount a 256 MB jffs2 image (without using 256 MB of RAM)?

[Tomasz Chmielewski]

Jeff Angielski schrieb:
> On Fri, 2006-01-13 at 12:46 +0100, Tomasz Chmielewski wrote:
> 
>>Are there any alternative ways to mount a jffs2 image, so that it 
>>doesn't take so much RAM?
> 
> 
> You might want to take a look at this under "Procedure":
> 
> http://www.handhelds.org/moin/moin.cgi/FamiliarBackupHowto
> 
> Google is your friend....  :)

I googled long enough, then I asked at this list as I didn't found :)

It works, well, almost.

Why the image mounted this way is read only?


-- 
Tomasz Chmielewski
http://wpkg.org

Re: how to mount a 256 MB jffs2 image (without using 256 MB of RAM)?

[Tomasz Chmielewski]

Tomasz Chmielewski schrieb:
> Jeff Angielski schrieb:
> 
>> On Fri, 2006-01-13 at 12:46 +0100, Tomasz Chmielewski wrote:
>>
>>> Are there any alternative ways to mount a jffs2 image, so that it 
>>> doesn't take so much RAM?
>>
>>
>>
>> You might want to take a look at this under "Procedure":
>>
>> http://www.handhelds.org/moin/moin.cgi/FamiliarBackupHowto
>>
>> Google is your friend....  :)
> 
> 
> I googled long enough, then I asked at this list as I didn't found :)
> 
> It works, well, almost.
> 
> Why the image mounted this way is read only?

Well, not really "read only", but whenever I try to remove anything, the 
system says "not enough space", and refuses to remove files (or add 
them), which results in the filesystem being read-only.


-- 
Tomasz Chmielewski
http://wpkg.org