From: Brian Norris <computersforpeace@gmail.com>
To: Josh Wu <josh.wu@atmel.com>
Cc: mark.rutland@arm.com, devicetree@vger.kernel.org,
pawel.moll@arm.com, ijc+devicetree@hellion.org.uk,
robh+dt@kernel.org, linux-mtd@lists.infradead.org,
galak@codeaurora.org
Subject: Re: [PATCH v2] mtd: atmel_nand: make PMECC lookup table and offset property optional
Date: Fri, 19 Sep 2014 09:34:31 -0700 [thread overview]
Message-ID: <20140919163431.GE1193@ld-irv-0074> (raw)
In-Reply-To: <541A92E3.60906@atmel.com>
On Thu, Sep 18, 2014 at 04:08:03PM +0800, Josh Wu wrote:
> On 9/18/2014 8:32 AM, Brian Norris wrote:
> >On Mon, Aug 18, 2014 at 03:08:40PM +0800, Josh Wu wrote:
> >>+static int pmecc_build_galois_table(int mm,
> >>+ int16_t *index_of, int16_t *alpha_to)
> >>+{
...
> >>+}
> >Is this algorithm documented? How did you come up with this?
>
> It is not documented in datasheet. It is based BCH algorithm. But do
> you know if the soft BCH use a same table like this?
I haven't delved into the algorithms here too much. Other BCH/ECC codes
do similar steps, but either (1) there's usually a few comments about
their origin or else (2) they're transparently handled by hardware ECC
engines and software doesn't need to care about the details much.
Brian
prev parent reply other threads:[~2014-09-19 16:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-18 7:08 [PATCH v2] mtd: atmel_nand: make PMECC lookup table and offset property optional Josh Wu
2014-09-17 8:31 ` Josh Wu
2014-09-18 0:32 ` Brian Norris
2014-09-18 8:08 ` Josh Wu
2014-09-19 16:34 ` Brian Norris [this message]
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