From: LiuShuo <b35362@freescale.com>
To: Scott Wood <scottwood@freescale.com>
Cc: Artem.Bityutskiy@nokia.com, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org, shuo.liu@freescale.com,
linux-mtd@lists.infradead.org, akpm@linux-foundation.org,
dwmw2@infradead.org
Subject: Re: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip
Date: Wed, 7 Dec 2011 11:55:24 +0800 [thread overview]
Message-ID: <4EDEE3AC.7060000@freescale.com> (raw)
In-Reply-To: <4EDEAEB9.6020703@freescale.com>
=E4=BA=8E 2011=E5=B9=B412=E6=9C=8807=E6=97=A5 08:09, Scott Wood =E5=86=99=
=E9=81=93:
> On 12/03/2011 10:31 PM, shuo.liu@freescale.com wrote:
>> From: Liu Shuo<shuo.liu@freescale.com>
>>
>> Freescale FCM controller has a 2K size limitation of buffer RAM. In or=
der
>> to support the Nand flash chip whose page size is larger than 2K bytes=
,
>> we read/write 2k data repeatedly by issuing FIR_OP_RB/FIR_OP_WB and sa=
ve
>> them to a large buffer.
>>
>> Signed-off-by: Liu Shuo<shuo.liu@freescale.com>
>> ---
>> v3:
>> -remove page_size of struct fsl_elbc_mtd.
>> -do a oob write by NAND_CMD_RNDIN.
>>
>> drivers/mtd/nand/fsl_elbc_nand.c | 243 ++++++++++++++++++++++++++++=
++++++----
>> 1 files changed, 218 insertions(+), 25 deletions(-)
> What is the plan for bad block marker migration?
This patch has been ported to uboot now, I think we can make a special=20
uboot image for bad
block marker migration when first use the chip.
>> @@ -473,13 +568,72 @@ static void fsl_elbc_cmdfunc(struct mtd_info *mt=
d, unsigned int command,
>> * write so the HW generates the ECC.
>> */
>> if (elbc_fcm_ctrl->oob || elbc_fcm_ctrl->column !=3D 0 ||
>> - elbc_fcm_ctrl->index !=3D mtd->writesize + mtd->oobsize)
>> - out_be32(&lbc->fbcr,
>> - elbc_fcm_ctrl->index - elbc_fcm_ctrl->column);
>> - else
>> + elbc_fcm_ctrl->index !=3D mtd->writesize + mtd->oobsize) {
>> + if (elbc_fcm_ctrl->oob&& mtd->writesize> 2048) {
>> + out_be32(&lbc->fbcr, 64);
>> + } else {
>> + out_be32(&lbc->fbcr, elbc_fcm_ctrl->index
>> + - elbc_fcm_ctrl->column);
>> + }
> We need to limit ourselves to the regions that have actually been
> written to in the buffer. fbcr needs to be set separately for first an=
d
> last subpages, with intermediate subpages having 0, 64, or 2112 as
> appropriate. Subpages that are entirely before column or entirely afte=
r
> column + index should be skipped.
I have considered this case, but I don't think it is useful.
1.There isn't a 'length' parameter in driver interface, although we=20
can get it from 'index - column'.
2.To see nand_do_write_oob() in nand_base.c, it fill '0xff' to=20
entire oob area first and write the user data by nand_fill_oob(), then=20
call ecc.write_oob (default is nand_write_oob_std()). 'column' is=20
mtd->writesize and 'length' of write_buf() is mtd->oobsize. So I don't=20
think we need to deal with it there.
>> + } else {
>> + out_be32(&lbc->fir, FIR_OP_WB<< FIR_OP1_SHIFT);
>> + for (i =3D 1; i< n; i++) {
>> + if (i =3D=3D n - 1) {
>> + elbc_fcm_ctrl->use_mdr =3D 1;
>> + out_be32(&lbc->fir,
>> + (FIR_OP_WB<< FIR_OP1_SHIFT) |
>> + (FIR_OP_CM3<< FIR_OP2_SHIFT) |
>> + (FIR_OP_CW1<< FIR_OP3_SHIFT) |
>> + (FIR_OP_RS<< FIR_OP4_SHIFT));
> Please explicitly show the (FIR_OP_NOP<< FIR_OP0_SHIFT) compenent.
>
>> + } else if (mtd->writesize>=3D 2048&& mtd->writesize<=3D 16 * 1024) =
{
>> +
>> setbits32(&lbc->bank[priv->bank].or, OR_FCM_PGS);
> Don't insert a blank line here.
>
Ok.
-LiuShuo
> -Scott
next prev parent reply other threads:[~2011-12-07 3:51 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-04 4:31 [PATCH 1/3] mtd/nand : use elbc_fcm_ctrl->oob to set FPAR_MS bit of FPAR shuo.liu
2011-12-04 4:31 ` [PATCH 2/3] mtd/nand : set correct length to FBCR for a non-full-page write shuo.liu
2011-12-04 4:31 ` [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip shuo.liu
2011-12-05 6:47 ` Artem Bityutskiy
2011-12-05 19:46 ` Scott Wood
2011-12-06 11:49 ` Artem Bityutskiy
2011-12-06 11:49 ` Artem Bityutskiy
2011-12-07 0:09 ` Scott Wood
2011-12-07 3:55 ` LiuShuo [this message]
2011-12-07 19:11 ` Scott Wood
2011-12-08 10:44 ` LiuShuo
2011-12-08 18:43 ` Scott Wood
2011-12-12 21:09 ` Artem Bityutskiy
2011-12-12 21:15 ` Scott Wood
2011-12-12 21:19 ` Artem Bityutskiy
2011-12-12 21:30 ` Scott Wood
2011-12-13 2:46 ` LiuShuo
2011-12-14 8:41 ` LiuShuo
2011-12-14 20:15 ` Scott Wood
2011-12-15 4:59 ` Li Yang
2011-12-15 17:32 ` Scott Wood
2011-12-16 2:44 ` LiuShuo
2011-12-16 17:59 ` Scott Wood
2011-12-19 11:05 ` Li Yang
2011-12-19 16:47 ` Scott Wood
2011-12-20 9:08 ` Li Yang
2011-12-20 19:48 ` Scott Wood
2011-12-17 14:35 ` Artem Bityutskiy
2011-12-19 18:38 ` Scott Wood
2011-12-19 18:42 ` Scott Wood
2011-12-14 3:41 ` LiuShuo
2011-12-14 20:53 ` Scott Wood
2011-12-05 6:50 ` [PATCH 1/3] mtd/nand : use elbc_fcm_ctrl->oob to set FPAR_MS bit of FPAR Artem Bityutskiy
-- strict thread matches above, loose matches on Subject: below --
2011-11-24 0:41 b35362
2011-11-24 0:41 ` [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip b35362
2011-11-24 7:37 ` Li Yang-R58472
2011-11-28 17:20 ` Scott Wood
2011-11-24 7:41 ` Artem Bityutskiy
2011-11-24 7:49 ` Li Yang-R58472
2011-11-24 8:16 ` Artem Bityutskiy
2011-11-24 10:02 ` LiuShuo
2011-11-24 11:07 ` Artem Bityutskiy
2011-11-28 21:48 ` Scott Wood
2011-11-28 21:49 ` Scott Wood
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=4EDEE3AC.7060000@freescale.com \
--to=b35362@freescale.com \
--cc=Artem.Bityutskiy@nokia.com \
--cc=akpm@linux-foundation.org \
--cc=dwmw2@infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mtd@lists.infradead.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=scottwood@freescale.com \
--cc=shuo.liu@freescale.com \
/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;
as well as URLs for NNTP newsgroup(s).