From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qc0-x236.google.com ([2607:f8b0:400d:c01::236]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Y9ImJ-0007mm-Rj for linux-mtd@lists.infradead.org; Thu, 08 Jan 2015 19:29:56 +0000 Received: by mail-qc0-f182.google.com with SMTP id r5so4086618qcx.13 for ; Thu, 08 Jan 2015 11:29:32 -0800 (PST) Date: Thu, 8 Jan 2015 11:29:28 -0800 From: Brian Norris To: Daniel Ehrenberg Subject: Re: WP# line on flash chip? Message-ID: <20150108192928.GU9759@ld-irv-0074> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Cc: Steve deRosier , "linux-mtd@lists.infradead.org" List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, Jan 08, 2015 at 11:00:03AM -0800, Daniel Ehrenberg wrote: > In fact, the kernel > can't drive it appropriately because the important time to hold it low > is before the kernel is up (or actually it can go low sooner than > that), That's not true. It's also helpful to have it low during a power cut scenario, which theoretically can occur at any time. > and by the time the kernel is up, it's fine to have it high all > the time. As Steve quoted Micron, it's good to keep WP asserted when you're not writing to the flash. Brian