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h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jKDwU6qCHx/OiJp9i/J/E9UgrqMYtUFZ9YIKoZ1nLA8=; b=obZyPhFvxzqi67rpClmp0uemQXyhVAptA6qC/rrXQTaglZY2VEyf5HOIB7FCK9RuBfzBKT zk1MIWguaqNh1YOHX8S3cLrG1n/bgicF4qneiQ7i8C0G8HCGz7ro0P1LVzg+FkFupcagfb afl7CYSwEei68bXZzXGEaQdM9ITYEkkSBhIXkx6uvvtu9H3QiYm8dfYCcNCIoX916v8OH+ pdNj8u3khEZDhKrdmwQM2nVCUnXcJdOnzk8W30TfDECn2UMyBIfgdgghszeg1S53eFYYRu dpD4oSTKojdF4owiFKp+aloV2FerZ/1nOOmEJLNAxIFBtGJJdaXQrG1IZ+m2Zw== Date: Thu, 13 Apr 2023 10:22:00 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , Yixun Lan , , , , , , , "yonghui.yu" Subject: Re: [PATCH v1 4/5] mtd: rawnand: meson: clear OOB buffer before read Message-ID: <20230413102200.309fbe9c@xps-13> In-Reply-To: <7520e512-8a19-ff04-364c-b5be0a579ef0@sberdevices.ru> References: <20230412061700.1492474-1-AVKrasnov@sberdevices.ru> <20230412061700.1492474-5-AVKrasnov@sberdevices.ru> <20230412094400.3c82f631@xps-13> <20230412113654.183350d0@xps-13> <4eace0a0-f6af-7d99-a52f-7913a2139330@sberdevices.ru> <20230412141824.755b2bca@xps-13> <20230412145715.58c2be4a@xps-13> <7c996832-258f-001c-56bd-87bbdf23eeaa@amlogic.com> <20230412163214.0c764bb3@xps-13> <0c61eaae-053e-5768-a533-70b2ff0cc95d@amlogic.com> <7520e512-8a19-ff04-364c-b5be0a579ef0@sberdevices.ru> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230413_012210_057253_613C422A X-CRM114-Status: GOOD ( 40.35 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: 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b=obZyPhFvxzqi67rpClmp0uemQXyhVAptA6qC/rrXQTaglZY2VEyf5HOIB7FCK9RuBfzBKT zk1MIWguaqNh1YOHX8S3cLrG1n/bgicF4qneiQ7i8C0G8HCGz7ro0P1LVzg+FkFupcagfb afl7CYSwEei68bXZzXGEaQdM9ITYEkkSBhIXkx6uvvtu9H3QiYm8dfYCcNCIoX916v8OH+ pdNj8u3khEZDhKrdmwQM2nVCUnXcJdOnzk8W30TfDECn2UMyBIfgdgghszeg1S53eFYYRu dpD4oSTKojdF4owiFKp+aloV2FerZ/1nOOmEJLNAxIFBtGJJdaXQrG1IZ+m2Zw== Date: Thu, 13 Apr 2023 10:22:00 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , Yixun Lan , , , , , , , "yonghui.yu" Subject: Re: [PATCH v1 4/5] mtd: rawnand: meson: clear OOB buffer before read Message-ID: <20230413102200.309fbe9c@xps-13> In-Reply-To: <7520e512-8a19-ff04-364c-b5be0a579ef0@sberdevices.ru> References: <20230412061700.1492474-1-AVKrasnov@sberdevices.ru> <20230412061700.1492474-5-AVKrasnov@sberdevices.ru> <20230412094400.3c82f631@xps-13> <20230412113654.183350d0@xps-13> 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dpD4oSTKojdF4owiFKp+aloV2FerZ/1nOOmEJLNAxIFBtGJJdaXQrG1IZ+m2Zw== Date: Thu, 13 Apr 2023 10:22:00 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , Yixun Lan , , , , , , , "yonghui.yu" Subject: Re: [PATCH v1 4/5] mtd: rawnand: meson: clear OOB buffer before read Message-ID: <20230413102200.309fbe9c@xps-13> In-Reply-To: <7520e512-8a19-ff04-364c-b5be0a579ef0@sberdevices.ru> References: <20230412061700.1492474-1-AVKrasnov@sberdevices.ru> <20230412061700.1492474-5-AVKrasnov@sberdevices.ru> <20230412094400.3c82f631@xps-13> <20230412113654.183350d0@xps-13> <4eace0a0-f6af-7d99-a52f-7913a2139330@sberdevices.ru> <20230412141824.755b2bca@xps-13> <20230412145715.58c2be4a@xps-13> <7c996832-258f-001c-56bd-87bbdf23eeaa@amlogic.com> <20230412163214.0c764bb3@xps-13> <0c61eaae-053e-5768-a533-70b2ff0cc95d@amlogic.com> <7520e512-8a19-ff04-364c-b5be0a579ef0@sberdevices.ru> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230413_012210_057253_613C422A X-CRM114-Status: GOOD ( 40.35 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org SGkgQXJzZW5peSwKCmF2a3Jhc25vdkBzYmVyZGV2aWNlcy5ydSB3cm90ZSBvbiBUaHUsIDEzIEFw ciAyMDIzIDEwOjAwOjI0ICswMzAwOgoKPiBPbiAxMy4wNC4yMDIzIDA5OjExLCBMaWFuZyBZYW5n IHdyb3RlOgo+ID4gCj4gPiBPbiAyMDIzLzQvMTMgMTM6MzIsIExpYW5nIFlhbmcgd3JvdGU6ICAK PiA+PiBIaSBNaXF1ZWwsCj4gPj4KPiA+PiBPbiAyMDIzLzQvMTIgMjI6MzIsIE1pcXVlbCBSYXlu 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[IPv6:2001:4b98:dc4:8::229]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D3AC2717 for ; Thu, 13 Apr 2023 01:22:05 -0700 (PDT) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id A20A2FF811; Thu, 13 Apr 2023 08:22:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1681374123; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jKDwU6qCHx/OiJp9i/J/E9UgrqMYtUFZ9YIKoZ1nLA8=; b=obZyPhFvxzqi67rpClmp0uemQXyhVAptA6qC/rrXQTaglZY2VEyf5HOIB7FCK9RuBfzBKT zk1MIWguaqNh1YOHX8S3cLrG1n/bgicF4qneiQ7i8C0G8HCGz7ro0P1LVzg+FkFupcagfb afl7CYSwEei68bXZzXGEaQdM9ITYEkkSBhIXkx6uvvtu9H3QiYm8dfYCcNCIoX916v8OH+ pdNj8u3khEZDhKrdmwQM2nVCUnXcJdOnzk8W30TfDECn2UMyBIfgdgghszeg1S53eFYYRu dpD4oSTKojdF4owiFKp+aloV2FerZ/1nOOmEJLNAxIFBtGJJdaXQrG1IZ+m2Zw== Date: Thu, 13 Apr 2023 10:22:00 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , Yixun Lan , , , , , , , "yonghui.yu" Subject: Re: [PATCH v1 4/5] mtd: rawnand: meson: clear OOB buffer before read Message-ID: <20230413102200.309fbe9c@xps-13> In-Reply-To: <7520e512-8a19-ff04-364c-b5be0a579ef0@sberdevices.ru> References: <20230412061700.1492474-1-AVKrasnov@sberdevices.ru> <20230412061700.1492474-5-AVKrasnov@sberdevices.ru> <20230412094400.3c82f631@xps-13> <20230412113654.183350d0@xps-13> <4eace0a0-f6af-7d99-a52f-7913a2139330@sberdevices.ru> <20230412141824.755b2bca@xps-13> <20230412145715.58c2be4a@xps-13> <7c996832-258f-001c-56bd-87bbdf23eeaa@amlogic.com> <20230412163214.0c764bb3@xps-13> <0c61eaae-053e-5768-a533-70b2ff0cc95d@amlogic.com> <7520e512-8a19-ff04-364c-b5be0a579ef0@sberdevices.ru> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Arseniy, avkrasnov@sberdevices.ru wrote on Thu, 13 Apr 2023 10:00:24 +0300: > On 13.04.2023 09:11, Liang Yang wrote: > >=20 > > On 2023/4/13 13:32, Liang Yang wrote: =20 > >> Hi Miquel, > >> > >> On 2023/4/12 22:32, Miquel Raynal wrote: =20 > >>> [ EXTERNAL EMAIL ] > >>> > >>> Hello, > >>> > >>> liang.yang@amlogic.com wrote on Wed, 12 Apr 2023 22:04:28 +0800: > >>> =20 > >>>> Hi Miquel and Arseniy, > >>>> > >>>> On 2023/4/12 20:57, Miquel Raynal wrote: =20 > >>>>> [ EXTERNAL EMAIL ] > >>>>> > >>>>> Hi Arseniy, > >>>>> > >>>>> avkrasnov@sberdevices.ru wrote on Wed, 12 Apr 2023 15:22:26 +0300: = =20 > >>>>>> On 12.04.2023 15:18, Miquel Raynal wrote: =20 > >>>>>>> Hi Arseniy, > >>>>>>> > >>>>>>> avkrasnov@sberdevices.ru wrote on Wed, 12 Apr 2023 13:14:52 +0300: > >>>>>>> =C2=A0=C2=A0=C2=A0 >>>> On 12.04.2023 12:36, Miquel Raynal wrote:= =20 > >>>>>>>>> Hi Arseniy, > >>>>>>>>> > >>>>>>>>> avkrasnov@sberdevices.ru wrote on Wed, 12 Apr 2023 12:20:55 +03= 00: > >>>>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 >>>>>> On 12.04.2023 10:44, Miqu= el Raynal wrote: =20 > >>>>>>>>>>> Hi Arseniy, > >>>>>>>>>>> > >>>>>>>>>>> AVKrasnov@sberdevices.ru wrote on Wed, 12 Apr 2023 09:16:58 += 0300: > >>>>>>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 >>>>>>>> This NAND= reads only few user's bytes in ECC mode (not full OOB), so > >>>>>>>>>>> > >>>>>>>>>>> "This NAND reads" does not look right, do you mean "Subpage r= eads do > >>>>>>>>>>> not retrieve all the OOB bytes,"? > >>>>>>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 >>>>>>>> fill OOB = buffer with zeroes to not return garbage from previous reads =20 > >>>>>>>>>>>> to user. > >>>>>>>>>>>> Otherwise 'nanddump' utility prints something like this for = just erased > >>>>>>>>>>>> page: > >>>>>>>>>>>> > >>>>>>>>>>>> ... > >>>>>>>>>>>> 0x000007f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > >>>>>>>>>>>> =C2=A0=C2=A0=C2=A0 OOB Data: ff ff ff ff 00 00 ff ff 80 cf 2= 2 99 cb ad d3 be > >>>>>>>>>>>> =C2=A0=C2=A0=C2=A0 OOB Data: 63 27 ae 06 16 0a 2f eb bb dd 4= 6 74 41 8e 88 6e > >>>>>>>>>>>> =C2=A0=C2=A0=C2=A0 OOB Data: 38 a1 2d e6 77 d4 05 06 f2 a5 7= e 25 eb 34 7c ff > >>>>>>>>>>>> =C2=A0=C2=A0=C2=A0 OOB Data: 38 ea de 14 10 de 9b 40 33 16 6= a cc 9d aa 2f 5e > >>>>>>>>>>>> > >>>>>>>>>>>> Signed-off-by: Arseniy Krasnov > >>>>>>>>>>>> --- > >>>>>>>>>>>> =C2=A0=C2=A0 drivers/mtd/nand/raw/meson_nand.c | 5 +++++ > >>>>>>>>>>>> =C2=A0=C2=A0 1 file changed, 5 insertions(+) > >>>>>>>>>>>> > >>>>>>>>>>>> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd= /nand/raw/meson_nand.c > >>>>>>>>>>>> index f84a10238e4d..f2f2472cb511 100644 > >>>>>>>>>>>> --- a/drivers/mtd/nand/raw/meson_nand.c > >>>>>>>>>>>> +++ b/drivers/mtd/nand/raw/meson_nand.c > >>>>>>>>>>>> @@ -858,9 +858,12 @@ static int meson_nfc_read_page_sub(stru= ct nand_chip *nand, > >>>>>>>>>>>> =C2=A0=C2=A0 static int meson_nfc_read_page_raw(struct nand_= chip *nand, u8 *buf, > >>>>>>>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 int oob_= required, int page) > >>>>>>>>>>>> =C2=A0=C2=A0 { > >>>>>>>>>>>> +=C2=A0=C2=A0=C2=A0 struct mtd_info *mtd =3D nand_to_mtd(nan= d); > >>>>>>>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 u8 *oob_buf =3D nand->o= ob_poi; > >>>>>>>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 int ret; > >>>>>>>>>>>> =C2=A0=C2=A0 >>>>>>>> +=C2=A0=C2=A0=C2=A0 memset(oob_buf, 0,= mtd->oobsize); =20 > >>>>>>>>>>> > >>>>>>>>>>> I'm surprised raw reads do not read the entire OOB? =20 > >>>>>>>>>> > >>>>>>>>>> Yes! Seems in case of raw access (what i see in this driver) n= umber of OOB bytes read > >>>>>>>>>> still depends on ECC parameters: for each portion of data cove= red with ECC code we can > >>>>>>>>>> read it's ECC code and "user bytes" from OOB - it is what i se= e by dumping DMA buffer by > >>>>>>>>>> printk(). For example I'm working with 2K NAND pages, each pag= e has 2 x 1K ECC blocks. > >>>>>>>>>> For each ECC block I have 16 OOB bytes which I can access by r= ead/write. Each 16 bytes > >>>>>>>>>> contains 2 bytes of user's data and 14 bytes ECC codes. So whe= n I read page in raw mode > >>>>>>>>>> controller returns 32 bytes (2 x (2 + 14)) of OOB. While OOB i= s reported as 64 bytes. =20 > >>>>>>>>> > >>>>>>>>> In all modes, when you read OOB, you should get the full OOB. T= he fact > >>>>>>>>> that ECC correction is enabled or disabled does not matter. If = the NAND > >>>>>>>>> features OOB sections of 64 bytes, you should get the 64 bytes. > >>>>>>>>> > >>>>>>>>> What happens sometimes, is that some of the bytes are not prote= cted > >>>>>>>>> against bitflips, but the policy is to return the full buffer. = =20 > >>>>>>>> > >>>>>>>> Ok, so to clarify case for this NAND controller: > >>>>>>>> 1) In both ECC and raw modes i need to return the same raw OOB d= ata (e.g. user bytes > >>>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0 + ECC codes)? =20 > >>>>>>> > >>>>>>> Well, you need to cover the same amount of data, yes. But in the = ECC > >>>>>>> case the data won't be raw (at least not all of it). =20 > >>>>>> > >>>>>> So "same amount of data", in ECC mode current implementation retur= ns only user OOB bytes (e.g. > >>>>>> OOB data excluding ECC codes), in raw it returns user bytes + ECC = codes. IIUC correct > >>>>>> behaviour is to always return user bytes + ECC codes as OOB data e= ven in ECC mode ? =20 > >>>>> > >>>>> If the page are 2k+64B you should read 2k+64B when OOB are requeste= d. > >>>>> > >>>>> If the controller only returns 2k+32B, then perform a random read to > >>>>> just move the read pointer to mtd->size + mtd->oobsize - 32 and > >>>>> retrieve the missing 32 bytes? =20 > >>>> > >>>> 1) raw read can read out the whole page data 2k+64B, decided by the = len in the controller raw read command: > >>>> =C2=A0=C2=A0=C2=A0=C2=A0cmd =3D (len & GENMASK(5, 0)) | scrambler | = DMA_DIR(dir); > >>>> after that, the missing oob bytes(not used) can be copied from meson= _chip->data_buf. so the implementation of meson_nfc_read_page_raw() is like= this if need. > >>>> =C2=A0=C2=A0=C2=A0=C2=A0{ > >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ...... > >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 meson_nfc_read_page_sub(n= and, page, 1); > >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 meson_nfc_get_data_oob(na= nd, buf, oob_buf); > >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 oob_len =3D (nand->ecc.by= tes + 2) * nand->ecc.steps; > >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 memcpy(oob_buf + oob_len,= meson_chip->data_buf + oob_len, mtd->oobsize - oob_len); > >>>> > >>>> =C2=A0=C2=A0=C2=A0=C2=A0} > >>>> 2) In ECC mode, the controller can't bring back the missing OOB byte= s. it can read out the user bytes and ecc bytes per meson_ooblayout_ops def= ine. =20 > >>> > >>> And then (if oob_required) you can bring the missing bytes with > >>> something along: > >>> nand_change_read_column_op(chip, mtd->writesize + oob_len, > >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 oob_buf + oob_len, > >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 mtd->oobsize - oob_len, > >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 false); > >>> Should not be a huge performance hit. =20 > >> > >> After finishing ECC mode reading, the column address internal in NAND = device should be the right pos; it doesn't need to change the column again.= so adding controller raw read for the missing bytes after ECC reading may = works. > >> =20 > > use raw read for the missing bytes, but they are not protected by host = ECC. to the NAND type of storage, is it ok or missing bytes better to be fi= lled with 0xff? =20 >=20 > IIUC Miqu=C3=A8l's reply, valid behaviour is to return full OOB data in b= oth modes. So in: > ECC mode it is user bytes(corrected by ECC, read from info buffer) + ECC = + missing bytes. ECC and missing bytes read in RAW mode. I believe the ECC bytes you'll get will be corrected. You can check this by using nandflipbits in mtd-utils. > RAW mode it is user bytes(not corrected by ECC) + ECC + missing bytes >=20 >=20 > Also @Liang, is this valid code (drivers/mtd/nand/raw/meson_nand.c)? >=20 > ret =3D nand_check_erased_ecc_chunk(data, ecc->size, > oob, ecc->bytes + 2, > NULL, 0, =20 > ecc->strength); >=20 > It confused me, because 'oob' buffer contains both user bytes and ECC cod= e, > 'ecc->bytes + 2' is 16. May be it should be: >=20 > ret =3D nand_check_erased_ecc_chunk(data, ecc->size, > oob + 2, ecc->bytes, > NULL, 0, =20 > ecc->strength); When you check for an erased chunk you should probably check the whole OOB area. >=20 > For example let's look on Tegra's driver (drivers/mtd/nand/raw/tegra_nand= .c): >=20 > u8 *oob =3D chip->oob_poi + nand->ecc.offset + = =20 > (chip->ecc.bytes * bit); =20 > =20 > ret =3D nand_check_erased_ecc_chunk(data, chip->e= cc.size, > oob, chip->ecc.= bytes, > NULL, 0, =20 > chip->ecc.stren= gth); >=20 > 'oob' contains 'nand->ecc.offset', and ECC length does not account user b= ytes length > (e.g. 2) - it is just 'chip->ecc.bytes' I haven't looked carefully, but be aware there are two user bytes reserved at the beginning of the OOB area for marking bad blocks. There *may* be a confusion somewhere. I am not saying there is one, just a hint if you can't find an explanation. Thanks, Miqu=C3=A8l