[maemo-developers] jffs2 on mmc?

[From: Tim Tisdall]

  I heard that the jffs2 had support for sdcards (I'm assuming that
means it doesn't do wear-leveling and leaves it to the
microcontroller), but that it still checks every bit on the card
before loading the OS.  However, I like the idea that JFFS2 has
journaling which ext2 does not and probably does it in a way that's
not requiring too many extra writes (like ext3).  Maybe I'll try it
with a reasonably sized partition and hope it doesn't take too long to
boot.

On Sun, May 18, 2008 at 5:24 PM, Tim Tisdall <tisdall at gmail.com> wrote:
>  I heard that the jffs2 had support for sdcards (I'm assuming that
> means it doesn't do wear-leveling and leaves it to the
> microcontroller), but that it still checks every bit on the card
> before loading the OS.  However, I like the idea that JFFS2 has
> journaling which ext2 does not and probably does it in a way that's
> not requiring too many extra writes (like ext3).  Maybe I'll try it
> with a reasonably sized partition and hope it doesn't take too long to
> boot.
>
> On Sun, May 18, 2008 at 1:52 AM, Ryan Abel <rabelg5 at gmail.com> wrote:
>> ed at okerson.com wrote:
>>
>>>>  I've been looking into booting from the sdcard and was wondering why
>>>> none of the "how to's" suggest formatting the card with jffs2.
>>>> There's
>>>> lots of debate between using ext2 or ext3, but nothing on using
>>>> jffs2.
>>>> Is there a simple reason for this I'm missing?
>>>
>>> JFFS2 is designed to be used on a raw flash device.  SD cards have a
>>> controller inside that hides the access to the raw flash and deals
>>> with
>>> things like write levelling, that JFFS2 would otherwise have to do in
>>> software.
>>
>> Yes, as Ed says, jffs2 would serve no purpose for an SD card. Besides,
>> can you imagine how long it would take to process a 16GB card into
>> memory every mount? :shudder:
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>