JFFS2 on NAND, Magic bitmask 0x1985 not found

[Pathompong Puengrostham]

Hi,

I just found the problem. It is that my NAND flash CE pin is not driven 
by GPIO. It is driven by CS from the CPU. Here is the change that I made.

--- mtd/drivers/mtd/nand/nand_base.c	2004-07-01 05:00:10.000000000 +0700
+++ linux/drivers/mtd/nand/nand_base.c	2004-07-14 11:32:37.419835456 +0700
@@ -990,8 +990,15 @@
  	 * by an GPIO pin ?
  	 */
  out:	
+#ifdef CONFIG_MTD_NAND_CE_NOT_GPIO
+	if (!this->dev_ready)
+		udelay (this->chip_delay);
+	else
+		while (!this->dev_ready(mtd));
+#else
  	this->select_chip(mtd, -1);
  	this->select_chip(mtd, chipnr);
+#endif
  	return res;
  }
  #endif
@@ -1248,8 +1255,15 @@
  		} else		
  			read += mtd->oobblock;

-		if (read == len)
+		if (read == len) {
+#ifdef CONFIG_MTD_NAND_CE_NOT_GPIO
+			if (!this->dev_ready)
+				udelay (this->chip_delay);
+			else
+				while (!this->dev_ready(mtd));
+#endif
  			break;	
+		}

  		/* For subsequent reads align to page boundary. */
  		col = 0;
@@ -1374,6 +1388,14 @@
  			        this->cmdfunc (mtd, NAND_CMD_READOOB, 0x0, page & 
this->pagemask);
  			}
  		}
+#ifdef CONFIG_MTD_NAND_CE_NOT_GPIO
+		else {
+			if (!this->dev_ready)
+				udelay (this->chip_delay);
+			else
+				while (!this->dev_ready(mtd));
+		}
+#endif
  	}

  	/* Deselect and wake up anyone waiting on the device */


I also had to add the following to my nand_init().

for (i = 0; nand_flash_ids[i].name != NULL; i++)
	nand_flash_ids[i].options |= NAND_NO_AUTOINCR;

Regards,
Jay

Pathompong Puengrostham wrote:
> Hi all,
> 
> Could anybody help me on this please? I mounted a cleanly erased NAND 
> flash , unmounted without writing anything into it and then mounted it 
> again. I got the following errors.
> 
> nand_read_ecc: Failed ECC read, page 0x000000e0
> mtd->read(0x400 bytes from 0x1c000) returned ECC error
> jffs2_scan_eraseblock(): Node at 0x0001c008 {0x1985, 0x2003, 0x00000008) 
> has invalid CRC 0xffff0000 (calculated 0x6b7c27e6)
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0001c00c: 
> 0x0008 instead
> nand_read_ecc: Failed ECC read, page 0x00000120
> mtd->read(0x400 bytes from 0x24000) returned ECC error
> jffs2_scan_eraseblock(): Node at 0x00024008 {0x1985, 0x2003, 0x00000008) 
> has invalid CRC 0xffff0000 (calculated 0x6b7c27e6)
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0002400c: 
> 0x0008 instead
> ...
> 
> This is the data that I dump out of the flash using "nanddump /dev/mtd3 
> dump.txt 114688 1024"
> 
> 0x0001c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> 0x0001c010: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ...
> 0x0001c1f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>   OOB Data: ff ff ff ff ff ff ff ff 85 19 03 20 08 00 00 00
> 0x0001c200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> 0x0001c210: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ...
> 0x0001c3f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>   OOB Data: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> 
> I can see that the magic bitmask 0x1985 is there. Why did JFFS2 look at 
> the wrong place and got 0x0008 instead?
> 
> I'm using mtd snapshot 20040707.
> 
> Thank you in advance.
> 
> Regards,
> Jay
> 
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