From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vk0-f66.google.com ([209.85.213.66]:35175 "EHLO mail-vk0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756051AbeDYS31 (ORCPT ); Wed, 25 Apr 2018 14:29:27 -0400 Received: by mail-vk0-f66.google.com with SMTP id h134so14465290vke.2 for ; Wed, 25 Apr 2018 11:29:27 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <90afbd8b-462d-8484-74e8-b983a9803fc4@gmail.com> References: <1524672875-14130-1-git-send-email-fabrizio.castro@bp.renesas.com> <90afbd8b-462d-8484-74e8-b983a9803fc4@gmail.com> From: Geert Uytterhoeven Date: Wed, 25 Apr 2018 20:29:25 +0200 Message-ID: Subject: Re: [PATCH/RFC v2] ARM: shmobile: defconfig: Enable LPAE To: Florian Fainelli Cc: Fabrizio Castro , Simon Horman , Geert Uytterhoeven , Chris Paterson , Magnus Damm , Russell King , Biju Das , Linux-Renesas , Linux ARM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: linux-renesas-soc-owner@vger.kernel.org List-ID: Hi Florian, On Wed, Apr 25, 2018 at 8:17 PM, Florian Fainelli wr= ote: > 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 >> Signed-off-by: Fabrizio Castro >> --- >> This information is mentioned in the "RZ/G Series User=E2=80=99s Manual:= Hardware", >> Chapter 2, Area Map. Is this patch going to break the functionality of o= ther >> 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, Thanks for reminding me! > then this would result in a kernel that would not boot on these > platforms. Can that be a problem with the shmobile_defconfig? Yes it is... Gr{oetje,eeting}s, Geert --=20 Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k= .org In personal conversations with technical people, I call myself a hacker. Bu= t when I'm talking to journalists I just say "programmer" or something like t= hat. -- Linus Torvalds From mboxrd@z Thu Jan 1 00:00:00 1970 From: geert@linux-m68k.org (Geert Uytterhoeven) Date: Wed, 25 Apr 2018 20:29:25 +0200 Subject: [PATCH/RFC v2] ARM: shmobile: defconfig: Enable LPAE In-Reply-To: <90afbd8b-462d-8484-74e8-b983a9803fc4@gmail.com> References: <1524672875-14130-1-git-send-email-fabrizio.castro@bp.renesas.com> <90afbd8b-462d-8484-74e8-b983a9803fc4@gmail.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Florian, On Wed, Apr 25, 2018 at 8:17 PM, Florian Fainelli wrote: > 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 >> Signed-off-by: Fabrizio Castro >> --- >> 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, Thanks for reminding me! > then this would result in a kernel that would not boot on these > platforms. Can that be a problem with the shmobile_defconfig? Yes it is... Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds