From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jean-Christophe PLAGNIOL-VILLARD Subject: Re: [PATCH v3 02/31] arm64: Kernel booting and initialisation Date: Mon, 10 Sep 2012 17:21:02 +0200 Message-ID: <20120910152102.GD31430@game.jcrosoft.org> References: <1347035226-18649-1-git-send-email-catalin.marinas@arm.com> <1347035226-18649-3-git-send-email-catalin.marinas@arm.com> <20120909172046.GB31430@game.jcrosoft.org> <20120910055339.GC31430@game.jcrosoft.org> <20120910125137.GC27042@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20120910125137.GC27042@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Catalin Marinas Cc: "linux-arch@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Arnd Bergmann , Nicolas Pitre List-Id: linux-arch.vger.kernel.org On 13:51 Mon 10 Sep , Catalin Marinas wrote: > On Mon, Sep 10, 2012 at 06:53:39AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote: > > On 19:29 Sun 09 Sep , Nicolas Pitre wrote: > > > On Sun, 9 Sep 2012, Jean-Christophe PLAGNIOL-VILLARD wrote: > > > > On 17:26 Fri 07 Sep , Catalin Marinas wrote: > > > > > +The image must be placed at the specified offset (currently 0x80000) > > > > > +from the start of the system RAM and called there. The start of the > > > > > +system RAM must be aligned to 2MB. > > > > can we drop this > > > > > > Drop what? > > > And why? > > This contrain the must be loadable at any address > > You can't easily load the kernel image at any address, unless it can > relocate itself and you have a way to specify PHYS_OFFSET. We don't want > a compile-time PHYS_OFFSET, the kernel detects it at boot time based on > the load address. so NACK kexec and other boot loaders require it Best Regards, J. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mo1.mail-out.ovh.net ([178.32.228.1]:48786 "EHLO mo1.mail-out.ovh.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752013Ab2IJQnN (ORCPT ); Mon, 10 Sep 2012 12:43:13 -0400 Received: from mail425.ha.ovh.net (b9.ovh.net [213.186.33.59]) by mo1.mail-out.ovh.net (Postfix) with SMTP id 18C76FF9D44 for ; Mon, 10 Sep 2012 17:31:39 +0200 (CEST) Date: Mon, 10 Sep 2012 17:21:02 +0200 From: Jean-Christophe PLAGNIOL-VILLARD Subject: Re: [PATCH v3 02/31] arm64: Kernel booting and initialisation Message-ID: <20120910152102.GD31430@game.jcrosoft.org> References: <1347035226-18649-1-git-send-email-catalin.marinas@arm.com> <1347035226-18649-3-git-send-email-catalin.marinas@arm.com> <20120909172046.GB31430@game.jcrosoft.org> <20120910055339.GC31430@game.jcrosoft.org> <20120910125137.GC27042@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120910125137.GC27042@arm.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Catalin Marinas Cc: Nicolas Pitre , "linux-arch@vger.kernel.org" , Arnd Bergmann , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Message-ID: <20120910152102.nvO96WzOtmfb9VVUe6bPjH4TTri8Uv4w1znEFu9Yo7U@z> On 13:51 Mon 10 Sep , Catalin Marinas wrote: > On Mon, Sep 10, 2012 at 06:53:39AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote: > > On 19:29 Sun 09 Sep , Nicolas Pitre wrote: > > > On Sun, 9 Sep 2012, Jean-Christophe PLAGNIOL-VILLARD wrote: > > > > On 17:26 Fri 07 Sep , Catalin Marinas wrote: > > > > > +The image must be placed at the specified offset (currently 0x80000) > > > > > +from the start of the system RAM and called there. The start of the > > > > > +system RAM must be aligned to 2MB. > > > > can we drop this > > > > > > Drop what? > > > And why? > > This contrain the must be loadable at any address > > You can't easily load the kernel image at any address, unless it can > relocate itself and you have a way to specify PHYS_OFFSET. We don't want > a compile-time PHYS_OFFSET, the kernel detects it at boot time based on > the load address. so NACK kexec and other boot loaders require it Best Regards, J.