what cause :**>> yaffs chunk 38598 was not erased

[liu.yaojin at zte.com.cn]

i think i found the reason.
in nand_base.c (2.6.24):
(about line 2506)
case NAND_ECC_SOFT:     //
                DBGOOB("we use ecc_soft mode\n");
                chip->ecc.calculate = nand_calculate_ecc;
                chip->ecc.correct = nand_correct_data;
                chip->ecc.read_page = nand_read_page_swecc;
                chip->ecc.write_page = nand_write_page_swecc;
                chip->ecc.read_oob = nand_read_oob_std;
                //focus this:
                chip->ecc.write_oob = nand_write_oob_std; 
                chip->ecc.size = 256; 
                chip->ecc.bytes = 3;
                break;

do you think "chip->..." is a bug?
i must replace "nand_write_oob_std",but it miss:
if(!chip->ecc.write_oob)...........................
So i change to:
if(!chip->ecc.write_oob)
    chip->ecc.write_oob = nand_write_oob_std; 

Now it seems to work ok.
=====================end ==========================




Charles Manning <manningc2 at actrix.gen.nz> 
发件人:  linux-mtd-bounces at lists.infradead.org
2009-07-30 06:30

收件人
linux-mtd at lists.infradead.org
抄送
liu.yaojin at zte.com.cn
主题
Re: what cause :**>> yaffs chunk 38598 was not erased






On Wednesday 29 July 2009 21:30:50 liu.yaojin at zte.com.cn wrote:
> hi guys:
>
> i use lastest yaffs filesystem,kernel is 2.6.24.
> my nand flash controller is a little slow.and when i copy(or ls)
> files(more than 1MB?),the console appears:
>
> **>> yaffs chunk 38598 was not erased
> **>> yaffs write required 2 attempts
> page 38598 in gc has no object: 0 0 0
>
> and etc...
> so why this happens continually ?
>

You're probably better off asking yaffs questions on the yaffs list: 
http://stoneboat.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs

This is happening because your spare area management is not correct and 
the 
tags are being messed up. Thiis causes yaffs to think that a page of flash 
is 
empty, but it is not.

-- Charles


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