[Mipsbook-devel] yaffs2

[Ruben Viets]

Hi Nikolaus,

I have simular result. Used df to see the size and available space on all partitions.

- It looks like the /dev/mtdblock3 is in use by jffs2 blocks. 
dmesg shows some prioritised blocks when mounting as yaffs2. So better to mount as jffs2 I think.

So far this kernel 2.6.24.3 and the updated sources are very usable now.  ;-)

Grt Ruben.


> Subject: Re: [Mipsbook-devel] yaffs2
> From: hns at computer.org
> Date: Wed, 16 Jun 2010 08:44:33 +0200
> CC: r_viets at hotmail.com; mipsbook-devel at linuxtogo.org
> To: hns at computer.org
> 
> 
> Am 16.06.2010 um 08:31 schrieb Dr. H. Nikolaus Schaller:
> 
> > 
> > Am 15.06.2010 um 20:34 schrieb Ruben Viets:
> > 
> >> Hi Nikolaus,
> >> 
> >> You already have all sources if you tar xvjf the linux-2.6.24.3 and afterwards patch -p1 < patch20080530 + patchv33_withoutyaffs2
> > 
> > Ok, this was  quite easy.
> > 
> > I did not find many differnces:
> > 
> > include/mtd/mtd-abi.h  -- different size for oob fields (which may be the issue)
> > fs-fs-writeback.c  -- different strategy for locking
> > fs/mpage.c  -- "It seems that there is a IO coherent bug in generic_file_mmap()"
> > fs/yaffs/*  -- about 50% of the files differ
> > 
> > 
> >> 
> >> Don't need to tar and send my files then. Question is if the below dirs you mention are enough. You may need additional files.
> >> So better start from scratch in a different dir and do a diff with your letux-400 development directory.
> >> 
> >> My latest config (CONFIG_RV9) is located at http://projects.kwaak.net/twiki/pub/Epc700/KernelPort26Compiling/CONFIG_RV9
> > 
> > Here I did not have CONFIG_MTD_SW_HM_ECC set and none of the VERIFY options
> > 
> > Now it *appears* to work. There are still some strange messages like "Freechunks verification failure" but I did not do a flash_eraseall - I just tried to continue to use the file system created with the broken yaffs2.
> 
> Ok, I have erased the minifs partition and mounted as yaffs2. The message has disappeared.
> 
> But there is a mismatch between used/available blocks and what I see as files (an empty lost+found directory). And 'du' reports 40% used.
> 
> When initializing as jffs2 I get 8% used and a completely empty device.
> 
> Or is yaffs inappropriate for small NAND partitions?
> 
> Nikolaus
 		 	   		  
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