Nand flash: hang after erase

Nand flash: hang after erase

[Elizabeth Clarke]

I'm playing with nandtest on an mtd partition, and found it hangs after
it has erased the first block. Putting in some debug I find that it gets
as far as the schedule call in mtdchar.c mtd_ioctl line 324. Here's a
snapshot:

	/*
	  FIXME: Allow INTERRUPTIBLE. Which means
	  not having the wait_queue head on the stack.
	  
	  If the wq_head is on the stack, and we
	  leave because we got interrupted, then the
	  wq_head is no longer there when the
	  callback routine tries to wake us up.
	*/
	ret = mtd->erase(mtd, erase);
	if (!ret) {
		set_current_state(TASK_UNINTERRUPTIBLE);
		add_wait_queue(&waitq, &wait);
		if (erase->state != MTD_ERASE_DONE &&
		    erase->state != MTD_ERASE_FAILED)
			schedule();
		remove_wait_queue(&waitq, &wait);
		set_current_state(TASK_RUNNING);
			ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
	}

Since I'm still on the beginning of the learning curve somewhat I have
no idea what this is trying to achieve, or where to go from here. Ideas,
pointers, please?

Ta,
Beth

Re: Nand flash: hang after erase

[David Woodhouse]

eclarke@aminocom.com said:
> I'm playing with nandtest on an mtd partition, and found it hangs
> after it has erased the first block. Putting in some debug I find that
> it gets as far as the schedule call in mtdchar.c mtd_ioctl line 324

What is erase->state? If the erase attempt has completed, either
successfully or otherwise, it should be one of the two values which 
prevents the call to schedule(). 

--
dwmw2

Re: Nand flash: hang after erase

[Elizabeth Clarke]

David Woodhouse wrote:
> What is erase->state? If the erase attempt has completed, either
> successfully or otherwise, it should be one of the two values which
> prevents the call to schedule().

erase->state is zero... nand_erase is not setting it appropriately. I
bunged in a line  instr->state = MTD_ERASE_DONE; on the way out and now
getting further. 

Beth

Re: Nand flash: hang after erase

[Elizabeth Clarke]

Elizabeth Clarke wrote:
> erase->state is zero... nand_erase is not setting it appropriately. I
> bunged in a line  instr->state = MTD_ERASE_DONE; on the way out and now
> getting further.

hmmm, interesting. Further means as far as noticing nandtest seems to
trash the manufacturers info. Doh, I should have realised that.

And this whilst mounting jffs2:

JFFS2: Erase block at 0x00014000 is not formatted. It will be
erased            nand_read_ecc: from = 0x00016000, len =
4096                                    nand_read_ecc: Failed ECC read,
page 0x000000b1                                
mtdblock_release                                                               
nand_sync: called
ok                                                                             
mount: Mounting /dev/mtdblock0 on /mnt/jffs2 failed: Invalid argument

Which is where I believe I had a genuine bad block. I thought JFFS2 is
supposed to handle bad blocks? Or have I got the wrong impression...

Beth

Re: Nand flash: hang after erase

[Thomas Gleixner]

[-- Attachment #1: Type: text/plain, Size: 1156 bytes --]

On Thursday, 24. January 2002 14:23, David Woodhouse wrote:
> eclarke@aminocom.com said:
> > I'm playing with nandtest on an mtd partition, and found it hangs
> > after it has erased the first block. Putting in some debug I find that
> > it gets as far as the schedule call in mtdchar.c mtd_ioctl line 324
>
> What is erase->state? If the erase attempt has completed, either
> successfully or otherwise, it should be one of the two values which
> prevents the call to schedule().

Hi !
I had the same problem some time ago. I sent my patches along with some 
rewrite for better support of different hardware to Steven Hill, who 
obviously maintains this nand stuff. I never got an answer.

The included diff is against kernel 2.4.17. 

The change in nand.c made NAND running. I have implemented JFFS and it works 
good (only mount time is a little bit ugly). I will try JFFS2 in the next 
weeks.

Thomas
__________________________________________________
Thomas Gleixner, autronix automation GmbH
auf dem berg 3, d-88690 uhldingen-muehlhofen
fon: +49 7556 919891 , fax: +49 7556 919886
mail: gleixner@autronix.de, http: www.autronix.de  

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