2008-03-04 06:39:14 Big problem with bads block of Nand flash

Cyril HAENEL (FRANCE)

Message: 52020 Hi all,

My uImage is stored in Nand Flash. To boot on it in u-boot I use the "nboot 1000000 0 0" command.

To program my uImage in the flash under uclinux, I do :

eraseall /dev/mtd0

nandwrite -p -b1 /dev/mtd0 uImage

Until now, everything was OK.

But a bad erase block appeared in the flash and now I can't boot anymore.

Thus the only solution is to have a filesystem in the flash. But I read on the u-boot documentation that u-boot can read a file from a filesystem !?

How can I do ? :((

Regards,

Cyril

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2008-03-04 08:25:24 Re: Big problem with bads block of Nand flash

Mike Frysinger (UNITED STATES)

Message: 52021 the file in u-boot/doc/README.nand covers the nand functions

note that when it says things like "read.jffs2" and "write.jffs2", it isnt restricted to jffs2 ... it just means it does badblock handling

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2008-03-04 10:18:38 Re: Big problem with bads block of Nand flash

Cyril HAENEL (FRANCE)

Message: 52031 Ok.....

So the easiest way for me is to modify the nandwrite version I use to just skip bad block and continue the write in the next block.

Normally nand read.jff2 will skip the bad block too I still have a complete file without read error.

I try this now !

Regards,

Cyril

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2008-03-04 12:35:08 Re: Big problem with bads block of Nand flash

Cyril HAENEL (FRANCE)

Message: 52043 Ok, no need to modify nandwrite : it automatically skips bads block and continues its job.

And under u-boot, the nand read.jffs2 skip bad block during read, and continue it's job.

So it seem's to be OK, now I am able to boot on the flash containing bad erase blocks.

But I have a question :

Before, I used the nboot 1000000 0 xxx command, and I think this command read only the good number of byte to get the entire image, and no more.

But now, to boot with the read.jffs2 option, I have 2 commands line to do at boot :

nand read.jffs2 1000000 ADDRESS SIZE

bootm 1000000

But because I don't know the image size, do I must read the entire chip without specify the size parameter ?

On some product I can do that because the boot time is not important, but on another (the car computer for example), the boot must be a fast as possible, and it will be great to only read the number of byte of the image but no more !

Is a solution exists for this problem ?

Regards,

Cyril

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2008-03-04 13:13:07 Re: Big problem with bads block of Nand flash

Mike Frysinger (UNITED STATES)

Message: 52046 there is currently no way to do what you want, but this patch should add the features you're after:

http://blackfin.uclinux.org/gf/project/u-boot/tracker/?action=TrackerItemEdit&tracker_item_id=3509

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2008-03-05 03:32:58 Re: Big problem with bads block of Nand flash

Cyril HAENEL (FRANCE)

Message: 52070 Great !

It's exactly what I wanted to do today : modify the nboot command to skip bads block and works as read.jffs2 !

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2008-10-31 07:48:15 Re: Big problem with bads block of Nand flash

Christophe Crepin (FRANCE)

Message: 64523

Hi ,

I have a problem to update the kernel image on linux .

when:

eraseall /dev/mtd0

cp linux /dev/mtd0 or nandwrite /dev/mtd0 linux 0

but i have everytime the same error :nand_write: Attempt to write not page aligned data .

I see that you use several option for nandwrite, when i looking at my nandwrite i don't use this option, I suppose that we not use the same where i can fin your version of nandwrite(mtd_utils) ? .

my hardware configuration :

Linux version 2.6.22.18-ADI-2008R1-svn (crepinc@crepinc-desktop) (gcc version 4.1.2 (ADI svn))

Compiled for ADSP-BF537 Rev 0.3

JFFS2 version 2.2. (NAND) Â 2001-2006 Red Hat, Inc.block2mtd: version $Revision: 3544 $

NAND device: Manufacturer ID: 0x2c, Chip ID: 0xda (Micron NAND 256MiB 3,3V 8-bit)

Creating 2 MTD partitions on "NAND 256MiB 3,3V 8-bit":

0x00000000-0x01400000 : "linux kernel"

mtd: Giving out device 0 to linux kernel

0x01400000-0x10000000 : "file system"

mtd: Giving out device 1 to file system.

If it's not the good solution , Can you give my a anather solution to update the kernel image from linux ?

Ps: I try the solution on u-boot with fsload but it doesn't work on the flash nand .

thanks

christophe

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2008-10-31 14:26:24 Re: Big problem with bads block of Nand flash

Robin Getz (UNITED STATES)

Message: 64548

Christophe:

new issue == new thread. Please don't re-start old threads with unrelated topics.

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