From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Subject: Re: MMC quirks relating to performance/lifetime. Date: Sat, 12 Feb 2011 18:05:47 +0100 Message-ID: <201102121805.47311.arnd@arndb.de> References: <201102091013.56670.arnd@arndb.de> Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from moutng.kundenserver.de ([212.227.126.186]:53501 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751104Ab1BLRGB (ORCPT ); Sat, 12 Feb 2011 12:06:01 -0500 In-Reply-To: Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Andrei Warkentin Cc: linux-arm-kernel@lists.infradead.org, Linus Walleij , linux-mmc@vger.kernel.org On Friday 11 February 2011 23:33:42 Andrei Warkentin wrote: > On Wed, Feb 9, 2011 at 3:13 AM, Arnd Bergmann wrote: > Yes, this is a Toshiba card. I've sent the patch as a reply to Linus' email. > > cid - 02010053454d3332479070cc51451d00 > csd - d00f00320f5903ffffffffff92404000 > erase_size - 524288 > fwrev - 0x0 > hwrev - 0x0 > manfid - 0x000002 > name - SEM32G > oemid - 0x0100 > preferred_erase_size - 2097152 Very interesting. So the manfid is the same as on most Kingston cards, but the oemid is different. Most cards have a two-letter ASCII code in there, 0x544d ("TM") on Kingston cards, and I always assumed that this stood for "Toshiba Memory". What is even stranger is the size value (among other fields) in the CSD, the card claims a size of exactly 32GB, which I find hard to believe, given that there are always some bad and reserved blocks. Are you sure that the card you have is authentic? I've heard a lot about fake USB sticks advertising a size that is much larger than the actual flash inside of them. Also this is the first card that I see advertise an allocation unit size of 2MB (preferred_erase_size), all other cards seem to advertise 4 MB these days, even if they actually have 2 or 8 MB. Arnd