linux-kernel - Re: [PATCH 0/3] Add SMP support for i.MX7D

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Message-ID: <CAOMZO5DaL+CKQe0hOHi_Kv8Vt9y0RHyERS8ek78WebxFmjj9rg@mail.gmail.com>
Date:   Fri, 26 Aug 2016 09:43:08 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Anson Huang <Anson.Huang@....com>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH 0/3] Add SMP support for i.MX7D

Hi Anson,

On Fri, Aug 26, 2016 at 8:12 AM, Anson Huang <Anson.Huang@....com> wrote:
> i.MX7D has 2 Cortex-A7 ARM cores, and it has a different GPC design
> than i.MX6, so this patch set adds a new GPCV2 driver for i.MX7D,
> and also adds runtime check in SMP code to support both Cortex-A9
> and Cortex-A7 ARM cores.
>
> With this patch set, i.MX7D can boot up SMP kernel with 2 CPUs.

Currently mx7d can boot the 2 CPUs if you use PSCI in the bootloader.

Give mainline U-Boot a try and it will boot the 2 CPUs via PSCI.

There was an attempt to add gpcv2 support at:
https://patchwork.kernel.org/patch/6919831/

, and Shawn suggested to go to the PSCI approach.

PSCI for mx7 is still missing suspend support though.

Regards,

Fabio Estevam