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Message-ID: <20140915144259.GA1947@localhost.localdomain> Date: Mon, 15 Sep 2014 22:43:02 +0800 From: Huang Shijie <shijie8@...il.com> To: Brian Norris <computersforpeace@...il.com> Cc: Boris BREZILLON <boris.brezillon@...e-electrons.com>, Huang Shijie <shijie.huang@...el.com>, Mike Voytovich <mvoytovich@...pal.com>, linux-kernel@...r.kernel.org, Huang Shijie <b32955@...escale.com>, linux-mtd@...ts.infradead.org, Roy Lee <roylee@...pal.com>, David Woodhouse <dwmw2@...radead.org>, linux-arm-kernel@...ts.infradead.org Subject: Re: [PATCH] mtd: nand: gpmi: add proper raw access support On Sat, Sep 13, 2014 at 10:38:41AM -0700, Brian Norris wrote: > On Sat, Sep 13, 2014 at 11:36:24PM +0800, Huang Shijie wrote: > > On Fri, Sep 12, 2014 at 02:30:50PM +0200, Boris BREZILLON wrote: > > > This test validates what's returned by ecc_strength file in sysfs > > > (which in turn is specified by the NAND controller when initializing > > > the NAND chip). > > > > > > Doing this should not imply knowing the ECC algorithm in use in the > > > NAND controller or the layout used to store data on NAND. > > the difficulty is that the ECC parity area can be not byte aligned. > > Is there a problem with just rounding up to the nearest byte alignment > and ignoring the few bits that are wasted? I feel a little confused with the two hooks. does the ecc->write_page_raw need to write the ECC parity data? The page's layout after an ecc->write_page will look like this: (Block Mark) | | | D | |<---->| V V +---+----------+-+----------+-+----------+-+----------+-+ | M | data |E| data |E| data |E| data |E| +---+----------+-+----------+-+----------+-+----------+-+ What will the page's layout look like after the ecc->write_page_raw? thanks Huang Shijie -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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