From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 76161 invoked by alias); 4 Mar 2016 10:26:02 -0000 Mailing-List: contact crossgcc-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: crossgcc-owner@sourceware.org Received: (qmail 76147 invoked by uid 89); 4 Mar 2016 10:26:01 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD,SPF_PASS autolearn=ham version=3.3.2 spammy=states, privilege X-HELO: foss.arm.com Received: from foss.arm.com (HELO foss.arm.com) (217.140.101.70) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Fri, 04 Mar 2016 10:26:00 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9163A3A1; Fri, 4 Mar 2016 02:25:02 -0800 (PST) Received: from e105689-lin.cambridge.arm.com (e105689-lin.cambridge.arm.com [10.2.207.32]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 436073F25F; Fri, 4 Mar 2016 02:25:58 -0800 (PST) Subject: Re: [crosstool-ng/crosstool-ng] 1f5906: samples: add aarch64-rpi3-linux-gnueabi To: mike@raspberryvi.org, crossgcc@sourceware.org References: <56d870b18e978_31e63fb5b061d2bc23875@hookshot-fe5-cp1-prd.iad.github.net.mail> <56D89FA5.6080208@raspberryvi.org> From: "Richard Earnshaw (lists)" Message-ID: <56D962B4.4080903@arm.com> Date: Fri, 04 Mar 2016 10:26:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 In-Reply-To: <56D89FA5.6080208@raspberryvi.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2016-03/txt/msg00022.txt.bz2 On 03/03/16 20:33, Mike Ray wrote: > Foundation forum mods and developers haven't mentioned whether > boot-loader needs to be 64-bit as well. In common with other 64-it systems, like x86 for example, to run a 64-bit application you need a 64-bit operating system, and to run a 64-bit operating system you need a 64-bit boot-loader. The privilege levels in the system only support running 64-bit at one privilege level if the level above it is running at 64-bit; and you can only switch states as you enter a privilege level, so if your top-level boot code isn't 64-bit you'll never be able to get back to that state. R. -- For unsubscribe information see http://sourceware.org/lists.html#faq