From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nicolas Ferre Subject: Re: [PATCH v2 0/2] ARM: at91: properly handle LPDDR poweroff Date: Wed, 19 Oct 2016 16:30:55 +0200 Message-ID: <585ae249-07ef-5299-17aa-2bcf79a09f24@atmel.com> References: <20161019114420.15213-1-alexandre.belloni@free-electrons.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Geert Uytterhoeven , Alexandre Belloni Cc: Sebastian Reichel , Dmitry Eremin-Solenikov , Jean-Jacques Hiblot , Linux PM list , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" List-Id: linux-pm@vger.kernel.org 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