mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Herve Codina <herve.codina@celad.com>
To: Josh Wu <josh.wu@atmel.com>
Cc: barebox@lists.infradead.org, linux-arm-kernel@lists.infradead.org
Subject: Re: nand pmecc crash detected
Date: Thu, 6 Mar 2014 18:42:05 +0100	[thread overview]
Message-ID: <5318B36D.4020700@celad.com> (raw)
In-Reply-To: <5313FACC.8030202@atmel.com>

Dear Josh

As suggested, i made a patch and sent it this week to
linux-mtd@lists.infradead.org and linux-arm-kernel@lists.infradead.org.
Hope you have seen it. Is subject is : "[PATCH] Disable Subpage nand
write when using Atmel PMECC".

Best regards,
Herve




Le 03/03/2014 04:45, Josh Wu a écrit :
> Dear Herve
> 
> On 2/28/2014 11:53 PM, Herve Codina wrote:
>> Hi,
>>
>> I am using an sam5d35 and its pmecc nand ecc controller.
>>
>> In barebox, using similar atmel_nand.c the system crashes.
>>
>> The problem was a call to chip->ecc.hwctl from nand_write_subpage_hwecc
>> (nand_base.c) when we write a sub page.
>>
>> chip->ecc.hwctl function is not set when we are using PMECC controller.
>>
>> As a workaround, i set NAND_NO_SUBPAGE_WRITE for PMECC controller in
>> order to disable sub page access in nand_write_page.
>>
>> I think we can have the same problem in Linux. I do not performed
>> subpage nand writes from Linux but i made the following patch according
>> to my Barebox defect.
> 
> Thank you for catching this crash bug. The fix is fine for me. But I 
> think it's better to send out the Linux kernel patch alone.
> 
> You can rebase your patch on the top of Linux-mtd git 
> repo(git://git.infradead.org/l2-mtd.git) instead of your local Linux.
> Then use 'git send-email' send to linux-mtd@lists.infradead.org and 
> linux-arm-kernel@lists.infradead.org. I will ack your patch.
> 
> If the patch is merged in Linux-mtd, it should be easier port to barebox 
> then.
> 
>>
>> Here after are my patches (same modification) for 1st my local Barebox
>> and 2nd my local Linux :
>>
>> ---8<-------------------
>>  From 757e8dbf141619a55b7a5b1ca11780b2589eacc1 Mon Sep 17 00:00:00 2001
>> From: Herve Codina <Herve.CODINA@celad.com>
>> Date: Fri, 28 Feb 2014 08:39:08 +0100
>> Subject: [PATCH 5/5] Disable Subpage nand write when using Atmel PMECC.
>>
>>
>> Signed-off-by: Herve Codina <Herve.CODINA@celad.com>
>> ---
>>   drivers/mtd/nand/atmel_nand.c |    1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
>> index 2ff7427..cdbe685 100644
>> --- a/drivers/mtd/nand/atmel_nand.c
>> +++ b/drivers/mtd/nand/atmel_nand.c
>> @@ -837,6 +837,7 @@ static int __init
>> atmel_pmecc_nand_init_params(struct device_d *dev,
>>   		return err_no;
>>   	}
>>
>> +	nand_chip->options |= NAND_NO_SUBPAGE_WRITE;
>>   	nand_chip->ecc.read_page = atmel_nand_pmecc_read_page;
>>   	nand_chip->ecc.write_page = atmel_nand_pmecc_write_page;
>>
> 
> Best Regards,
> Josh Wu
> 

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

  parent reply	other threads:[~2014-03-06 17:42 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-28 15:53 Herve Codina
2014-03-03  3:45 ` Josh Wu
2014-03-04  4:02   ` Jean-Christophe PLAGNIOL-VILLARD
2014-03-06 17:42   ` Herve Codina [this message]
2014-03-03  7:58 ` Sascha Hauer

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=5318B36D.4020700@celad.com \
    --to=herve.codina@celad.com \
    --cc=barebox@lists.infradead.org \
    --cc=josh.wu@atmel.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox