Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S942465AbcJSObL (ORCPT ); Wed, 19 Oct 2016 10:31:11 -0400 Received: from eusmtp01.atmel.com ([212.144.249.243]:24669 "EHLO eusmtp01.atmel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932806AbcJSObG (ORCPT ); Wed, 19 Oct 2016 10:31:06 -0400 Subject: Re: [PATCH v2 0/2] ARM: at91: properly handle LPDDR poweroff To: Geert Uytterhoeven , Alexandre Belloni References: <20161019114420.15213-1-alexandre.belloni@free-electrons.com> CC: Sebastian Reichel , Dmitry Eremin-Solenikov , Jean-Jacques Hiblot , "Linux PM list" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" From: Nicolas Ferre Organization: atmel Message-ID: <585ae249-07ef-5299-17aa-2bcf79a09f24@atmel.com> Date: Wed, 19 Oct 2016 16:30:55 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-Originating-IP: [10.145.133.18] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 739 Lines: 20 Le 19/10/2016 à 16:07, Geert Uytterhoeven a écrit : > On Wed, Oct 19, 2016 at 1:44 PM, Alexandre Belloni > wrote: >> LPDDR memories can only handle up to 400 uncontrolled power offs in their >> life. The proper power off sequence has to be applied before shutting down the >> SoC. > > Interesting. How many boards have been killed during kernelci.org > operation? The reason given above is usually the one that prevent manufacturers from using LPDDR on "evaluation" boards. So all Atmel boards use SDRAM/DDR2/DDR3 not the LP variants. Final products (and internal validation boards, obviously) though use these type of RAM so we must be prepared to handle them. Best regards, -- Nicolas Ferre