linux-kernel - Re: [PATCH v3 5/9] mtd: pxa3xx_nand: add support for the Marvell Berlin nand controller

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Message-ID: <54FD860F.2000008@free-electrons.com>
Date:	Mon, 09 Mar 2015 08:37:51 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
CC:	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	sebastian.hesselbarth@...il.com, dwmw2@...radead.org,
	computersforpeace@...il.com, thomas.petazzoni@...e-electrons.com,
	boris.brezillon@...e-electrons.com, linux-kernel@...r.kernel.org,
	zmxu@...vell.com, linux-mtd@...ts.infradead.org,
	jszhang@...vell.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 5/9] mtd: pxa3xx_nand: add support for the Marvell
 Berlin nand controller

On 03/08/2015 07:19 PM, Robert Jarzmik wrote:
> Ezequiel Garcia <ezequiel.garcia@...e-electrons.com> writes:
> 
>>> I think you'll kill the zylonite board, and I'll nack it if that's the case. At
>>> least that's what happened when I tried to use onfi default values last time in
>>> barebox development.
>>>
>>> I can test your changes, but if the specific zylonite nand (ie. nand id 0xba20,
>>> ie. pxa310 embedded flash) gets broken, I'm against the removal of the legacy
>>> timings removal.
>>>
>>
>> I'm not speaking of any timing params here, but about the flash
>> identification.
>>
>> Which flash do you have there?
> The one with 0xba20 id as I said, which is AFAIK a Numonyx NAND02GR4B2C.
> 

$ grep "0xBA" drivers/mtd/nand/nand_ids.c
EXTENDED_ID_NAND("NAND 256MiB 1,8V 16-bit", 0xBA, 256, LP_OPTIONS16),

Seems already supported by the NAND core. The MTD way of probing
a non-ONFI device is by using the IDs in nand_ids.c. Additional
configuration (timings in this case) is applied between the nand_scan_ident()
and nand_scan_tail() calls.

-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com
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