ECC & Magic bitmask errors with JFFS2 file system on 6.23 kernel for powerpc

ECC & Magic bitmask errors with JFFS2 file system on 6.23 kernel for powerpc

[Rupesh Kumar]

Hi

We are using Linux kernel 2.6.23 from freescale LTIB 
(MPC8313E_RDB_K26_20081226-LTIB.iso) on our custom board. 
JFFS2 is used as RFS and  nand write.jffs2 utility in the u-boot is used 
to burn the image on to the nand flash. 

When we boot for the first time everything seems to be OK. On subsequent 
reboots we are seeing following error messages reported by kernel on 
bootup. 
In addition we also see Magic bitmask errors being reported. 

///////////////////////////
mtd->read(0x400 bytes from 0x1b00000) returned ECC error
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01b001d0: 
0xfffe instead
mtd->read(0x400 bytes from 0x2500000) returned ECC error
mtd->read(0x400 bytes from 0x27c0000) returned ECC error
mtd->read(0x400 bytes from 0x2c20000) returned ECC error
mtd->read(0x400 bytes from 0x2cc0000) returned ECC error
mtd->read(0x400 bytes from 0x2d00000) returned ECC error
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x02d00074: 
0xfffe instead
Empty flash at 0x02d00078 ends at 0x02d003e4
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x02d003e4: 
0xffef instead
Empty flash at 0x02d003e8 ends at 0x02d00780
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x02d00780: 
0xfffb instead
mtd->read(0x400 bytes from 0x3320000) returned ECC error
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x03320190: 
0xffff instead
Empty flash at 0x03320194 ends at 0x0332047c
////////////////////////////

We verified erase size passed as an argument for creating jffs2 file 
system (initial googling on the issue).
After contacting freescale we came to know that, it is a known issue and 
they dont have planned to work on this in near future. :(
Please give your valuable suggestions so that we can fix this problem and 
make our board running properly.

Thanks
Rupesh

Re: ECC & Magic bitmask errors with JFFS2 file system on 6.23 kernel for powerpc

[Louise.Yeung]

[-- Attachment #1: Type: text/plain, Size: 4189 bytes --]

*Hi Rupesh,

We are using a Freescale processor similar to yours with NAND flash 
supporting 2KB page size .
We wonder if you were able to get any further with this problem that you 
posted.

Thanks
Louise and Ravinder
Sun embedded systems group

Rupesh Kumar* Rupesh.Kumar at Lntemsys.com 
<mailto:linuxppc-dev%40lists.ozlabs.org?Subject=Re%3A%20ECC%20%26%20Magic%20bitmask%20errors%20with%20JFFS2%20file%20system%20on%206.23%20kernel%20for%0A%09powerpc&In-Reply-To=%3COF4DA6695F.B8912DE2-ON652575F5.004F0DE0-652575F5.00519736%40lntemsys.com%3E>
/Fri Jul 17 01:03:11 EST 2009/

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------------------------------------------------------------------------

Hi

We are using Linux kernel 2.6.23 from freescale LTIB 
(MPC8313E_RDB_K26_20081226-LTIB.iso) on our custom board. 
JFFS2 is used as RFS and  nand write.jffs2 utility in the u-boot is used 
to burn the image on to the nand flash. 

When we boot for the first time everything seems to be OK. On subsequent 
reboots we are seeing following error messages reported by kernel on 
bootup. 
In addition we also see Magic bitmask errors being reported. 

///////////////////////////
mtd->read(0x400 bytes from 0x1b00000) returned ECC error
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01b001d0: 
0xfffe instead
mtd->read(0x400 bytes from 0x2500000) returned ECC error
mtd->read(0x400 bytes from 0x27c0000) returned ECC error
mtd->read(0x400 bytes from 0x2c20000) returned ECC error
mtd->read(0x400 bytes from 0x2cc0000) returned ECC error
mtd->read(0x400 bytes from 0x2d00000) returned ECC error
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x02d00074: 
0xfffe instead
Empty flash at 0x02d00078 ends at 0x02d003e4
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x02d003e4: 
0xffef instead
Empty flash at 0x02d003e8 ends at 0x02d00780
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x02d00780: 
0xfffb instead
mtd->read(0x400 bytes from 0x3320000) returned ECC error
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x03320190: 
0xffff instead
Empty flash at 0x03320194 ends at 0x0332047c
////////////////////////////

We verified erase size passed as an argument for creating jffs2 file 
system (initial googling on the issue).
After contacting freescale we came to know that, it is a known issue and 
they dont have planned to work on this in near future. :(
Please give your valuable suggestions so that we can fix this problem and 
make our board running properly.

Thanks
Rupesh

------------------------------------------------------------------------

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Re: ECC & Magic bitmask errors with JFFS2 file system on 6.23 kernel for powerpc

[Anton Vorontsov]

On Mon, Aug 31, 2009 at 01:39:10PM -0700, Louise.Yeung@Sun.COM wrote:
> *Hi Rupesh,
> 
> We are using a Freescale processor similar to yours with NAND flash
> supporting 2KB page size .

What kernel version and NAND driver you use? I don't think that old
BSP kernels include fsl_elbc_nand driver, which is a much improved
version of the fsl_fcm driver.

So you might want to swith to a newer kernel or back-port the
fsl_elbc_nand driver[1] and a few fixes to your kernel.

[1] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=history;f=drivers/mtd/nand/fsl_elbc_nand.c

-- 
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2

Re: ECC & Magic bitmask errors with JFFS2 file system on 6.23 kernel for powerpc

[Rupesh Kumar]

Hi Louise,

Earlier we were using kernel 2.6.20(released with LTIB for REVA board of 
MPC8313E) and we were not seeing this problem in that kernel. Since, We 
had time constraint for our project, best thing we did was ported 2.6.20 
kernel on rev 2.1 silicon of MPC8313E. This is working fine.

However, We did try to dig this problem further and found that the problem 
occurs because of the ECC alignment mismatch in read & write on NAND 
flash.
You can look into following points :- 
        1) NAND initialization :-  Page size mentioned correctly in BR/OR 
register Settings.
        2) rfs is made with correct erase size.
        3) ECC placement used in u-boot & Kernel nand driver is same.
        4) Try using different ECC alignments and see if it makes some 
difference.


Regards 
Rupesh 





Anton Vorontsov <avorontsov@ru.mvista.com> 
09/01/2009 05:17 AM
Please respond to
avorontsov@ru.mvista.com


To
Louise.Yeung@Sun.COM
cc
linuxppc-dev@lists.ozlabs.org, louise <louise@Sun.COM>, Ravinder Kumar 
<Ravinder.Kumar@Sun.COM>, Rupesh Kumar <Rupesh.Kumar@Lntemsys.com>
Subject
Re: ECC & Magic bitmask errors with JFFS2 file system on 6.23 kernel for 
powerpc






On Mon, Aug 31, 2009 at 01:39:10PM -0700, Louise.Yeung@Sun.COM wrote:
> *Hi Rupesh,
> 
> We are using a Freescale processor similar to yours with NAND flash
> supporting 2KB page size .

What kernel version and NAND driver you use? I don't think that old
BSP kernels include fsl_elbc_nand driver, which is a much improved
version of the fsl_fcm driver.

So you might want to swith to a newer kernel or back-port the
fsl_elbc_nand driver[1] and a few fixes to your kernel.

[1] 
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=history;f=drivers/mtd/nand/fsl_elbc_nand.c


-- 
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2

Re: ECC & Magic bitmask errors with JFFS2 file system on 6.23 kernel for powerpc

[Ravinder Kumar]

On Aug 31, 2009, at 4:47 PM, Anton Vorontsov wrote:

> On Mon, Aug 31, 2009 at 01:39:10PM -0700, Louise.Yeung@Sun.COM wrote:
>> *Hi Rupesh,
>>
>> We are using a Freescale processor similar to yours with NAND flash
>> supporting 2KB page size .
>
> What kernel version and NAND driver you use? I don't think that old
> BSP kernels include fsl_elbc_nand driver, which is a much improved
> version of the fsl_fcm driver.

We are using 2.6.23 kernel with freescale patches. The sources have  
fsl_elbc driver.
I think the newer BSP kernels have fsl_elbc_nand driver. Will look at  
it.

Thanks
Ravinder

>
> So you might want to swith to a newer kernel or back-port the
> fsl_elbc_nand driver[1] and a few fixes to your kernel.
>
> [1] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=history;f=drivers/mtd/nand/fsl_elbc_nand.c
>
> -- 
> Anton Vorontsov
> email: cbouatmailru@gmail.com
> irc://irc.freenode.net/bd2