linux-kernel - Re: mxc_nand.c on mach-imx/imx53

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Date:	Mon, 03 Sep 2012 11:10:27 +0200
From:	Roland Stigge <stigge@...com.de>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	Eric Bénard <eric@...rea.com>,
	linux-mtd@...ts.infradead.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: mxc_nand.c on mach-imx/imx53

On 09/03/2012 10:55 AM, Sascha Hauer wrote:
> On Fri, Aug 31, 2012 at 12:57:37PM +0200, Roland Stigge wrote:
>> On 08/31/2012 11:05 AM, Roland Stigge wrote:
>>> I tried to port this on top of Sascha's patches for imx53, only for mxc v3 for now, as below.
>>>
>>> Unfortunately, I still get:
>>>
>>> ...
>>> UnCorrectable RS-ECC Error
>>> UnCorrectable RS-ECC Error
>>> UnCorrectable RS-ECC Error
>>> UnCorrectable RS-ECC Error
>>> UnCorrectable RS-ECC Error
> 
> Have you written the data you are unable to read with this driver?

No, maybe that's one of the reasons. The bootloader also seems to
implement a different on-flash layout. But as written, the problem is
gone with the below fix.

>> --- linux-2.6.orig/drivers/mtd/nand/mxc_nand.c
>> +++ linux-2.6/drivers/mtd/nand/mxc_nand.c
>> @@ -1141,14 +1141,14 @@ static void mxc_nand_command(struct mtd_
>>                 host->devtype_data->send_cmd(host, command, true);
>>                 mxc_do_addr_cycle(mtd, column, page_addr);
>>                 host->devtype_data->send_read_id(host);
>> -               host->buf_start = column;
>> +               host->buf_start = 0;
>>                 break;
>>  
>>         case NAND_CMD_PARAM:
>>                 host->devtype_data->send_cmd(host, command, true);
>>                 mxc_do_addr_cycle(mtd, column, page_addr);
>>                 host->devtype_data->send_read_param(host);
>> -               host->buf_start = column;
>> +               host->buf_start = 0;
> 
> On what tree are you working? I cannot find a handling of
> NAND_CMD_PARAM in my tree.

That's on top of the patch I ported from Eric's barebox driver (other
mail, but only for imx53/v3 for now). Sorry for the confusion.

I can prepare a single patch, but maybe Eric's more knowledgeable on
this driver (including v1/v2 that I can't test), he announced a patch
for this week.

Roland
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