Fw: corrupt my NAND flash device

[Thomas Gleixner]

On Wednesday 30 April 2003 18:54, Alex Samoutin wrote:

> Yes I had absolutely the same problem. Some times first write command was
> ignored, but second always successful. However I have no problem with erase
> operations, only write some times was ignored.
>
> (For Thomas) It’s not a bad H/W or incorrect timing. I’ve played with
> timing and result was the same. Also I have 5 boards with Toshiba NAND chip
> and 2 of them are working fine without retry, but other 3 need retry for
> normal operation.

What timing params did you play with ?
Are CLE/ALE connected to GPIO pins ?
Do you use a ready function, which reads the R/B hardware pin ?

Can you please check the following: 

1. Add a delay into nand_wait and play with the time 

--- nand.c	14 Apr 2003 07:00:39 -0000	1.43
+++ nand.c	30 Apr 2003 17:05:26 -0000
@@ -226,6 +226,8 @@
 		this->hwcontrol (NAND_CTL_CLRALE);
 	}
 	
+	udelay (500);
+	
 	/* 
 	 * program and erase have their own busy handlers 
 	 * status and sequential in needs no delay

2.. Report if that helps or changes anything

3. Remove the erase abort in nand_get_chip
--- nand.c	14 Apr 2003 07:00:39 -0000	1.43
+++ nand.c	30 Apr 2003 17:08:23 -0000
@@ -287,16 +287,6 @@
 		return;
 	}
 
-	if (this->state == FL_ERASING) {
-		if (new_state != FL_ERASING) {
-			this->state = new_state;
-			spin_unlock_bh (&this->chip_lock);
-			nand_select ();	/* select in any case */
-			this->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
-			return;
-		}
-	}
-
 	set_current_state (TASK_UNINTERRUPTIBLE);
 	add_wait_queue (&this->wq, &wait);
 	spin_unlock_bh (&this->chip_lock);

4.. Report if that helps or changes anything

Thanks

-- 
Thomas
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