From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lazybastard.de ([212.112.238.170] helo=longford.logfs.org) by bombadil.infradead.org with esmtps (Exim 4.68 #1 (Red Hat Linux)) id 1JzxzM-0000s9-62 for linux-mtd@lists.infradead.org; Sat, 24 May 2008 17:57:05 +0000 Date: Sat, 24 May 2008 19:56:48 +0200 From: =?utf-8?B?SsO2cm4=?= Engel To: Alex Dubov Subject: Re: Support of removable MTD devices and other advanced features (follow-up from lkml) Message-ID: <20080524175647.GA7366@logfs.org> References: <20080523132853.GC22384@logfs.org> <380082.38285.qm@web36708.mail.mud.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <380082.38285.qm@web36708.mail.mud.yahoo.com> Cc: linux-mtd@lists.infradead.org List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Sat, 24 May 2008 06:12:23 -0700, Alex Dubov wrote: > > Do UBI and JFFS always operate in terms of whole eraseblocks or they may > attempt partial block writes? Different flash chips have different > capabilities in regard to writing and this can be used to some advantage. Writes happen in multiples of mtd->writesize. Which for NAND is pagesize. There are also special cases with subpage writes. AFAIK only UBI exploits that feature. Jörn -- Joern's library part 15: http://www.knosof.co.uk/cbook/accu06a.pdf