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From: Florian Fainelli <f.fainelli@gmail.com>
To: Fabrizio Castro <fabrizio.castro@bp.renesas.com>,
	Simon Horman <horms@verge.net.au>,
	Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Chris Paterson <Chris.Paterson2@renesas.com>,
	Magnus Damm <magnus.damm@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	Biju Das <biju.das@bp.renesas.com>,
	linux-renesas-soc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH/RFC v2] ARM: shmobile: defconfig: Enable LPAE
Date: Wed, 25 Apr 2018 11:17:00 -0700	[thread overview]
Message-ID: <90afbd8b-462d-8484-74e8-b983a9803fc4@gmail.com> (raw)
In-Reply-To: <1524672875-14130-1-git-send-email-fabrizio.castro@bp.renesas.com>

On 04/25/2018 09:14 AM, Fabrizio Castro wrote:
> On iWave's iwg20m DDR1 512MB memory cannot be accessed with 32-bit
> addresses, hence we need LPAE.
> 
> Signed-off-by: Biju Das <biju.das@bp.renesas.com>
> Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> ---
> This information is mentioned in the "RZ/G Series User’s Manual: Hardware",
> Chapter 2, Area Map. Is this patch going to break the functionality of other
> boards? Comments welcome.

LPAE is not supported by all Cortex-A class cores, for instance
Cortex-A9 does not support LPAE, if you have boards using such cores,
then this would result in a kernel that would not boot on these
platforms. Can that be a problem with the shmobile_defconfig?
-- 
Florian

WARNING: multiple messages have this Message-ID (diff)
From: f.fainelli@gmail.com (Florian Fainelli)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH/RFC v2] ARM: shmobile: defconfig: Enable LPAE
Date: Wed, 25 Apr 2018 11:17:00 -0700	[thread overview]
Message-ID: <90afbd8b-462d-8484-74e8-b983a9803fc4@gmail.com> (raw)
In-Reply-To: <1524672875-14130-1-git-send-email-fabrizio.castro@bp.renesas.com>

On 04/25/2018 09:14 AM, Fabrizio Castro wrote:
> On iWave's iwg20m DDR1 512MB memory cannot be accessed with 32-bit
> addresses, hence we need LPAE.
> 
> Signed-off-by: Biju Das <biju.das@bp.renesas.com>
> Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> ---
> This information is mentioned in the "RZ/G Series User?s Manual: Hardware",
> Chapter 2, Area Map. Is this patch going to break the functionality of other
> boards? Comments welcome.

LPAE is not supported by all Cortex-A class cores, for instance
Cortex-A9 does not support LPAE, if you have boards using such cores,
then this would result in a kernel that would not boot on these
platforms. Can that be a problem with the shmobile_defconfig?
-- 
Florian

  reply	other threads:[~2018-04-25 18:17 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-25 16:14 [PATCH/RFC v2] ARM: shmobile: defconfig: Enable LPAE Fabrizio Castro
2018-04-25 16:14 ` Fabrizio Castro
2018-04-25 18:17 ` Florian Fainelli [this message]
2018-04-25 18:17   ` Florian Fainelli
2018-04-25 18:29   ` Geert Uytterhoeven
2018-04-25 18:29     ` Geert Uytterhoeven
2018-04-26  9:34   ` Fabrizio Castro
2018-04-26  9:34     ` Fabrizio Castro

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