linux-kernel - Re: [PATCH v2 0/2] ARM: at91: properly handle LPDDR poweroff

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Message-ID: <585ae249-07ef-5299-17aa-2bcf79a09f24@atmel.com>
Date:   Wed, 19 Oct 2016 16:30:55 +0200
From:   Nicolas Ferre <nicolas.ferre@...el.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:     Sebastian Reichel <sre@...nel.org>,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        Jean-Jacques Hiblot <jjhiblot@...phandler.com>,
        "Linux PM list" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 0/2] ARM: at91: properly handle LPDDR poweroff

Le 19/10/2016 à 16:07, Geert Uytterhoeven a écrit :
> On Wed, Oct 19, 2016 at 1:44 PM, Alexandre Belloni
> <alexandre.belloni@...e-electrons.com> 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