From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Subject: Re: [PATCH 5/9] ps3: Preallocate bootmem memory for ps3fb Date: Tue, 30 Jan 2007 11:44:41 +0100 Message-ID: <200701301144.42120.arnd@arndb.de> References: <1170148116.26655.328.camel@localhost.localdomain> Reply-To: linux-fbdev-devel@lists.sourceforge.net Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.91] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1HBqUa-0007ag-4D for linux-fbdev-devel@lists.sourceforge.net; Tue, 30 Jan 2007 02:45:36 -0800 Received: from moutng.kundenserver.de ([212.227.126.177]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1HBqUX-0007ks-S9 for linux-fbdev-devel@lists.sourceforge.net; Tue, 30 Jan 2007 02:45:36 -0800 In-Reply-To: <1170148116.26655.328.camel@localhost.localdomain> Content-Disposition: inline List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-fbdev-devel-bounces@lists.sourceforge.net Errors-To: linux-fbdev-devel-bounces@lists.sourceforge.net To: Benjamin Herrenschmidt Cc: Geert Uytterhoeven , linuxppc-dev@ozlabs.org, Linux Frame Buffer Device Development , James Simmons , Paul Mackerras On Tuesday 30 January 2007 10:08, Benjamin Herrenschmidt wrote: > > > I'm afraid that assumption is usually false, as you only need to access the > > FLASH when you want to change boot flags or update the boot loader. > > At the same time, flash doesn't have to be fast... can't we use a > smaller bounce buffer (a page) and divide the transfer ? No, the problem is that the flash interface only supports an hcall for 'erase+write', but not separately, so the writes need to do in erase block size, even if the physical medium can probably handle smaller writes after a block was erased. Arnd <>< ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV