From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga09.intel.com ([134.134.136.24]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1Rmtec-0001R4-O9 for linux-mtd@lists.infradead.org; Mon, 16 Jan 2012 20:59:48 +0000 From: "Woodhouse, David" To: "dedekind1@gmail.com" Subject: Re: [PATCH v3 0/6] NAND BBM + BBT updates Date: Mon, 16 Jan 2012 20:59:34 +0000 Message-ID: <1326747569.11686.31.camel@shinybook.infradead.org> References: <1326140612-26323-1-git-send-email-computersforpeace@gmail.com> <4F0C086A.5070608@linutronix.de> <1326320928.2338.37.camel@koala> <4F0EA32E.20500@linutronix.de> <1326494218.2258.36.camel@koala> In-Reply-To: <1326494218.2258.36.camel@koala> Content-Language: en-GB Content-Type: multipart/signed; micalg=sha1; protocol="application/x-pkcs7-signature"; boundary="=-2Qw7PFtyG3MGDsEJQn7R" MIME-Version: 1.0 Cc: Dan Carpenter , Barry Song <21cnbao@gmail.com>, Sebastian Andrzej Siewior , Nicolas Ferre , Dominik Brodowski , "Hunter, Adrian" , Gabor Juhos , "linux-mtd@lists.infradead.org" , Jonas Gorski , Jamie Iles , Ivan Djelic , Robert Jarzmik , Maxim Levitsky , Dmitry Eremin-Solenikov , Kevin Cernekee , Kulikov Vasiliy , Jim Quinlan , Andres Salomon , Axel Lin , Anatolij Gustschin , Mike Frysinger , Arnd Bergmann , Lei Wen , Sascha Hauer , "Bityutskiy, Artem" , Florian Fainelli , Peter Wippich , Matthieu CASTET , Kyungmin Park , Shmulik Ladkani , Wolfram Sang , "Dong, Chuanxiao" , Joe Perches , Guillaume LECERF , Brian Norris , Roman Tereshonkov List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --=-2Qw7PFtyG3MGDsEJQn7R Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2012-01-14 at 00:36 +0200, Artem Bityutskiy wrote: > I think so, because it is distributed, and it is historically the way > blocks had been marked as bad, and I thing vendors make sure this > mechanism works.=20 They make sure it works for *them* at manufacturing time, sure. But what makes you so sure it'll work for *us*? They may have special ways to clear or even fuse out the the appropriate bits during manufacture, that we can't do from software. Or maybe they just throw away any chip where a bad block is *so* bad that they can't even clear the bad block marker? That might not affect their yield so much when it's used only for factory-bad blocks, but if we do it for *all* blocks that go bad at runtime, it's a different calculation. And a more 'interesting' failure mode because when we find it out, it's already in production. So I wouldn't necessarily assume that what works for them, will work for us. --=20 Sent with MeeGo's ActiveSync support. David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-2Qw7PFtyG3MGDsEJQn7R Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIO6jCCAz0w ggKmoAMCAQICAwWw/zANBgkqhkiG9w0BAQUFADBOMQswCQYDVQQGEwJVUzEQMA4GA1UEChMHRXF1 aWZheDEtMCsGA1UECxMkRXF1aWZheCBTZWN1cmUgQ2VydGlmaWNhdGUgQXV0aG9yaXR5MB4XDTA2 MDIxNjE4MDEzMFoXDTE2MDIxOTE4MDEzMFowUjELMAkGA1UEBhMCVVMxGjAYBgNVBAoTEUludGVs IENvcnBvcmF0aW9uMScwJQYDVQQDEx5JbnRlbCBFeHRlcm5hbCBCYXNpYyBQb2xpY3kgQ0EwggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDBpd/XOb9QVqEZ8mQ1042TdOIq3ATDIsV2xDyt 30yLyMR5Wjtus0bn3B+he89BiNO/LP6+rFzEwlD55PlX+HLGIKeNNG97dqyc30FElEUjZzTZFq2N 4e3kVJ/XAEEgANzV8v9qp7qWwxugPgfc3z9BkYot+CifozexHLb/hEZj+yISCU61kRZvuSQ0E11y YL4dRgcglJeaHo3oX57rvIckaLsYV5/1Aj+R8DM1Ppk965XQAKsHfnyT7C4S50T4lVn4lz36wOdN 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