From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jon Masters Subject: Re: [PATCH v3 02/31] arm64: Kernel booting and initialisation Date: Mon, 10 Sep 2012 16:28:57 -0400 Message-ID: <504E4D89.3020203@jonmasters.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> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mx1.redhat.com ([209.132.183.28]:61517 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932152Ab2IJU3M (ORCPT ); Mon, 10 Sep 2012 16:29:12 -0400 In-Reply-To: <20120910055339.GC31430@game.jcrosoft.org> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Jean-Christophe PLAGNIOL-VILLARD Cc: Nicolas Pitre , Catalin Marinas , linux-arch@vger.kernel.org, Arnd Bergmann , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org On 09/10/2012 01:53 AM, 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: >>>> +4. Call the kernel image >>>> +------------------------ >>>> + >>>> +Requirement: MANDATORY >>>> + >>>> +The decompressed kernel image contains a 32-byte header as follows: >>>> + >>>> + u32 magic = 0x14000008; /* branch to stext, little-endian */ >>>> + u32 res0 = 0; /* reserved */ >>>> + u64 text_offset; /* Image load offset */ >>>> + u64 res1 = 0; /* reserved */ >>>> + u64 res2 = 0; /* reserved */ >>> we need to have a magic to known it's a arm64 kernel >> >> You have it: it's 0x14000008 at the beginning. > fragile Others have commented on the relocatable kernel non-issue. But to this part, also bear in mind that Catalin pointed out boot standardization work may change how some AArch64 systems ultimately end up booting. Thanks, Jon.