linux-kernel - fsl elbc driver causes corruption with bus monitor timeouts while simultaneously access on Nor / Nand mtd partitions

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Date:	Thu, 14 Apr 2011 08:06:54 +0100 (BST)
From:	emre kara <emrekara2002@...oo.co.uk>
To:	Scott Wood <scottwood@...escale.com>,
	Roy Zang <tie-fei.zang@...escale.com>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	David Woodhouse <David.Woodhouse@...el.com>,
	Lan Chunhe-B25806 <b25806@...escale.com>,
	Wood Scott-B07421 <B07421@...escale.com>,
	Anton Vorontsov <cbouatmailru@...il.com>,
	felix@...edded-sol.com, bayraktarz@...oo.com
Subject: fsl elbc driver causes corruption with bus monitor timeouts while simultaneously access on Nor / Nand mtd partitions

Hi Scott, Roy.
Scott's "mtd: eLBC NAND: increase bus timeout to maximum" patch is excluded from kernel with Roy's "P4080/eLBC: Make Freescale elbc interrupt common to elbc devices" patch. I don't know the reason for it but this causes bus monitor timeouts and corrupts nand flash while using mainline kernel. As I know there is an errata related to this topic, I think "increasing bus timeout to maximum" is a must.
You can easly generate this situation with below commands:

Note: mtd4 is a Nor and mtd9 is a Nand partition.
[root@...20RDB root]# mount /dev/mtdblock9 /mnt/src/
mount: you must specify the filesystem type
[root@...20RDB root]# mount /dev/mtdblock9 /mnt/src/ -t jffs2
��JFFS2 notice: (1950) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
[root@...20RDB root]# dd if=/dev/mtd4 of=/mnt/src/uboot bs=1
fsl-lbc ffe05000.localbus: Local bus monitor time-out: LTESR 0x80000000
fsl-lbc ffe05000.localbus: command failed: fir 412e0000 fcr 0 status 80000000 mdr c0
Read of newly-erased block at 0x00430000 failed: -74. Putting on bad_list
fsl-lbc ffe05000.localbus: Local bus monitor time-out: LTESR 0x80000000
fsl-lbc ffe05000.localbus: command failed: fir 426db000 fcr 6070d000 status 80000000 mdr ff
Erase at 0x0042c000 failed immediately: errno -5
fsl-lbc ffe05000.localbus: Local bus monitor time-out: LTESR 0x80000000
Cfsl-lbc ffe05000.localbus: command failed: fir 412e0000 fcr 0 status 80000000 mdr c0
Read of newly-erased block at 0x00433000 failed: -74. Putting on bad_list
JFFS2: marking eraseblock at 00433000

Regards.

Emre

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