On 06-07-26 08:09 +0200, kim M wrote:
> Hi all
>
> I am considering switching from jffs2 to yaffs2 to improve mount time.
> Currently, I have aprox 30-60 sec mount time for a 22 MB partition + some
> additional 60 sec while the garbage collection continues to run.
>
> I have previously used YAFFS with success. Back then I was using the
> direct interface though.
>
> Currently I am on a 2.6.17.6 ARM kernel with a fresh YAFFS2 checkout and
> up-to-date MTD utils from git. I create my Image with mkyaffs2image and
> burn it using flash_eraseall + nandwrite -a -o. When mounted I get a
> single "lost+found" dir which contains a lot files:
>
> UCM]$ll /mnt/flash_fs/lost\+found/
> Using fallback suid method
> ?--------- 1 root root 535297448 Jan 1 00:06 obj100201
> ?--------- 1 root root 127526295 Jan 1 00:06 obj100250
> ?--------- 1 root root 382546882 Jan 1 00:06 obj1007
> ?--------- 1 root root 534871804 Jan 1 00:06 obj1008
> ?--------- 1 root root 511678771 Jan 1 00:06 obj1011
> ?--------- 1 root root 380946853 Jan 1 00:06 obj101205
> etc...
>
> I have tried applying the mtd2if2.c patch and switching back and forth
> between YAFFS and MTD ECC. Have I missed something here?
Well you are bang up to date on the code - more so than me right now.
You probably also want Vitaly's recent patch to make YAFFS2 match up
with latest MTD.
http://www.aleph1.co.uk/pipermail/yaffs/2006q3/002074.html
Also check that mkyaffs2image is laying out the OOB (tags and ECC) in
the same way that MTD is. That tool is ripe for improvement.
> BTW: what is the correct way of forcing YAFFS2 to use ECC calculated by
> MTD? I wan't to do this so I can burn the images from u-boot in the same
> way as I burn JFFS2 images.
unset CONFIG_YAFFS_DOES_ECC
> If I manage to get YAFFS2 running on my target, I want to enhance the
> mkyaffs2image to support root+permission squash plus support
> for device_table files. Is anyone else working on this?
That would be great. No, so far as I know, no-one else is working on
this - the device_table thing has been suggested as a Good Thing (TM)
before, and I am inclined to agree :-)
Wookey
--
Aleph One Ltd, Bottisham, CAMBRIDGE, CB5 9BA, UK Tel +44 (0) 1223 811679
work: http://www.aleph1.co.uk/ play: http://wookware.org/
(text/plain)