From: "Piotr Zięcik" <kosmo@semihalf.com>
To: John Rigby <jcrigby@gmail.com>
Cc: linuxppc-dev@ozlabs.org, linux-mtd@lists.infradead.org,
Wolfgang Denk <wd@denx.de>
Subject: Re: [PATCH 06/12] mpc5121: Added NAND Flash Controller driver.
Date: Wed, 13 May 2009 10:41:45 +0200 [thread overview]
Message-ID: <200905131041.45944.kosmo@semihalf.com> (raw)
In-Reply-To: <4b73d43f0905072030n1b014dafmea840387ab0f3a6d@mail.gmail.com>
=46riday 08 May 2009 05:30:15 John Rigby napisa=B3(a):
> Did you choose to not support hardware ECC so you could use the spare are=
a?
> The original driver only supported hardware ECC but unfortuneatly the
> hardware ECC includes the spare area so the spare area cannot be written
> separately.
In short yes. There are fundamental problems which you described. Flash=20
filesystems expect that ECC is calculated from main area only and writes to=
=20
spare area not change it. MPC5121 NAND flash controller calculates ECC from=
=20
both areas except few bytes holding ECC. This makes flash filesystems=20
unusable when we turn on hardware ECC.
This could be fixed by disabling spare area usage in flash filesystems but
this probably requires changes in the MTD/filesystem infrastructure.
=2D-=20
Best Regards.
Piotr Zi=EAcik
next prev parent reply other threads:[~2009-05-13 9:00 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-06 20:15 [PATCH 00/16] Add support for MPC512x Wolfgang Denk
2009-05-06 20:15 ` [PATCH 01/12] fs_enet: Use defines to set driver tunables Wolfgang Denk
2009-05-06 20:35 ` Grant Likely
2009-05-06 22:02 ` Wolfgang Denk
2009-05-06 22:41 ` Grant Likely
2009-05-06 20:15 ` [PATCH 02/12] fs_enet: Add MPC5121 FEC support Wolfgang Denk
2009-05-06 20:33 ` Grant Likely
2009-05-06 21:08 ` Scott Wood
2009-05-06 22:01 ` Wolfgang Denk
2009-05-06 22:29 ` Grant Likely
2009-05-06 22:41 ` Wolfgang Denk
2009-05-07 14:09 ` Grant Likely
2009-05-08 2:02 ` John Rigby
2009-05-08 7:52 ` David Miller
2009-05-11 6:56 ` David Jander
2009-05-07 8:14 ` David Jander
2009-05-07 13:05 ` Kumar Gala
2009-05-06 20:40 ` David Miller
2009-05-06 22:06 ` Wolfgang Denk
2009-05-06 20:41 ` Scott Wood
2009-05-06 22:09 ` Wolfgang Denk
2009-05-06 22:39 ` Grant Likely
2009-05-14 12:38 ` Piotr Zięcik
2009-05-14 14:00 ` Grant Likely
2009-05-18 22:17 ` Benjamin Herrenschmidt
2009-05-19 11:26 ` Piotr Zięcik
2009-05-19 21:56 ` Benjamin Herrenschmidt
2009-05-21 8:34 ` Piotr Zięcik
2009-05-21 15:36 ` Grant Likely
2009-05-06 20:15 ` [PATCH 03/12] fs_enet: Add FEC TX Alignment workaround for MPC5121 Wolfgang Denk
2009-05-06 20:37 ` Grant Likely
2009-05-06 22:12 ` Wolfgang Denk
2009-05-06 22:42 ` Grant Likely
2009-05-08 2:36 ` John Rigby
2009-05-06 20:15 ` [PATCH 04/12] mpc5121: Added reset module registers representation Wolfgang Denk
2009-05-06 20:29 ` Scott Wood
2009-05-06 21:57 ` Wolfgang Denk
2009-05-06 20:39 ` Grant Likely
2009-05-06 22:14 ` Wolfgang Denk
2009-05-06 20:15 ` [PATCH 05/12] mpc5121ads: Added Reset Module node to DTS Wolfgang Denk
2009-05-06 20:40 ` Grant Likely
2009-05-06 22:16 ` Wolfgang Denk
2009-05-06 22:46 ` Grant Likely
2009-05-06 20:15 ` [PATCH 06/12] mpc5121: Added NAND Flash Controller driver Wolfgang Denk
2009-05-06 20:59 ` Grant Likely
2009-05-08 2:22 ` John Rigby
2009-05-08 3:07 ` Grant Likely
2009-05-07 8:08 ` David Jander
2009-05-08 3:30 ` John Rigby
2009-05-13 8:41 ` Piotr Zięcik [this message]
2009-05-06 20:15 ` [PATCH 07/12] mpc5121ads: Clean up and fix NAND description in mpc5121ads DTS Wolfgang Denk
2009-05-06 21:00 ` Grant Likely
2009-05-06 20:15 ` [PATCH 08/12] mpc5121: Added I2C support Wolfgang Denk
2009-05-06 21:01 ` Grant Likely
2009-05-06 22:19 ` Wolfgang Denk
2009-05-06 22:51 ` Grant Likely
2009-05-07 2:41 ` Grant Likely
2009-05-07 6:36 ` Wolfgang Grandegger
2009-05-18 13:57 ` Piotr Zięcik
2009-05-18 14:11 ` Grant Likely
2009-05-18 14:29 ` Wolfgang Grandegger
2009-05-19 7:47 ` Piotr Zięcik
2009-05-19 8:10 ` Wolfgang Grandegger
2009-05-08 2:12 ` John Rigby
2009-05-08 3:01 ` Grant Likely
2009-05-06 20:15 ` [PATCH 09/12] mpc5121ads: Added I2C RTC node to mpc5121ads DTS Wolfgang Denk
2009-05-06 21:02 ` Grant Likely
2009-05-07 6:45 ` Wolfgang Grandegger
2009-05-06 20:15 ` [PATCH 10/12] mpc5121: Add MPC5121 Real time clock driver Wolfgang Denk
2009-05-06 21:03 ` Grant Likely
2009-05-06 21:06 ` Wolfram Sang
2009-05-06 22:40 ` Grant Likely
2009-05-08 2:41 ` [rtc-linux] " John Rigby
2009-05-08 15:53 ` Grant Likely
2009-05-08 16:09 ` Alessandro Zummo
2009-05-08 19:18 ` Wolfgang Denk
2009-05-08 16:10 ` Alessandro Zummo
2009-05-06 20:15 ` [PATCH 11/12] mpc5121: Added MPC512x DMA driver Wolfgang Denk
2009-05-06 21:07 ` Grant Likely
2009-05-08 2:49 ` John Rigby
2009-05-19 1:37 ` Hongjun Chen
2009-05-19 8:03 ` Piotr Zięcik
2009-05-20 0:39 ` Hongjun Chen
2009-05-06 20:15 ` [PATCH 12/12] mpc5121: Added default config for MPC5121 Wolfgang Denk
2009-05-06 21:08 ` Grant Likely
2009-05-06 22:23 ` Wolfgang Denk
2009-05-06 22:48 ` Grant Likely
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