From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C829C41513 for ; Thu, 17 Aug 2023 19:08:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354654AbjHQTHx (ORCPT ); Thu, 17 Aug 2023 15:07:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354667AbjHQTHt (ORCPT ); Thu, 17 Aug 2023 15:07:49 -0400 Received: from mail-pf1-x431.google.com (mail-pf1-x431.google.com [IPv6:2607:f8b0:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1FC0A2D5A for ; Thu, 17 Aug 2023 12:07:47 -0700 (PDT) Received: by mail-pf1-x431.google.com with SMTP id d2e1a72fcca58-68842ebdcf7so78846b3a.0 for ; Thu, 17 Aug 2023 12:07:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1692299266; x=1692904066; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=pMu12uY6gJkjDImtxtXIvQYeY9JKWACT5srHRfVOHgM=; b=RNEYOPiI3FU255/vUs7Dc56Jqw+r6ZJL8mOz1I9/Ibey5+DdM4VXoCU8WDGkUi6/Dr /efmiC79pzUhpGUp6A/SSpNUwdiQt5OTHvBjM+yh35Qxf4KhoKiujvHjJhq0/aWA/Ifq lqth4T+uv5gOxAsJoousHA0FaO85huJwz5tm+BJNo6sgB5t2fe5bVyEhxblAz5V9O5ka BwXiX3aPPUlj2QiZFad8vqObyNOet2PYb/JKxO2O8E3CiW4BDAXHT6tzAqVAtqT0Md6J EOHPcwCCyD+ktt2OHVMWYQCrZ1JPyqVYmyMqzh9fIOXwLnzZYKRom6G5szv70yXxpNIQ wFRA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692299266; x=1692904066; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=pMu12uY6gJkjDImtxtXIvQYeY9JKWACT5srHRfVOHgM=; b=c4wU9Lz1d02B8ydq7O1z7Bk7P6GP/2wugpIaiz7l725dG6n1OGIA2RM3ep9f7dJPFr uDeo6lhwBH5s3soWwzZcpDeLJpVhTm6LQ6NZzp4o0yJs1MqScwI6/QrmMqGj7URnqMhG rWPZtbF+N2JeX8sIjeNXGemNcjYmyDTi4n0jqv5TcmGVBXpJpCmtttbhztPxcQyHMULp WQmjq0KIduSdMlhBPLwT9xqlwlhhLqh1fhEayOjY7C/n5dEm5F4+jjB08NhkWYTbyoqE W0RNM/L79VOIKxPKPpmWyNhMOi69AEOHJZtGPwcG+zsNUJM3yGag89YxwWgYMNvTRzbq 1LUA== X-Gm-Message-State: AOJu0YxbTL5KSHNMQtPtD4vujbTFc7dTpKPUJgm0IV3F8Yhw1qgJO5DZ lyXNDv2jtptxmjPt6FQWWPVRDKYeT9M= X-Google-Smtp-Source: AGHT+IEVmkXYuO03DV+0uC23DSL9ehlGkQfYWv9Lcd3UY8cL3uQjAYy/b8tqjZHmcaC5jKLzK0uoew== X-Received: by 2002:a05:6a00:f87:b0:688:4abb:f16f with SMTP id ct7-20020a056a000f8700b006884abbf16fmr525127pfb.6.1692299266325; Thu, 17 Aug 2023 12:07:46 -0700 (PDT) Received: from ?IPV6:2001:df0:0:200c:e51d:7e20:1b6c:6331? ([2001:df0:0:200c:e51d:7e20:1b6c:6331]) by smtp.gmail.com with ESMTPSA id j22-20020aa79296000000b0068709861cb6sm102588pfa.137.2023.08.17.12.07.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 17 Aug 2023 12:07:45 -0700 (PDT) Message-ID: Date: Fri, 18 Aug 2023 07:07:39 +1200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Subject: Re: [PATCH RFC v3 2/2] m68k/q40: add data_swab option for pata_falcon to byte-swap disk data Content-Language: en-US To: Richard Z , Finn Thain Cc: will@sowerbutts.com, linux-m68k@vger.kernel.org, geert@linux-m68k.org References: <20230817035001.8400-1-schmitzmic@gmail.com> <20230817035001.8400-3-schmitzmic@gmail.com> From: Michael Schmitz In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org Hi Richard, On 17/08/23 22:27, Richard Z wrote: > Nitpicking now, there is nothing classic about little endian as all > older computers were either big or mid endian. Right, but IDE was introduced on little endian hardware. Maybe 'IDE default byte order' would be more exact here. > It is rather some rare ide host adapters like the Q40 one reversed the > byte order of 16bit words which was cheap and convenient in the > 1980-9ies but not interoperable with the large majority of other host > adapters resulting in a reversed byte/16bit order on disk. True - installing an IDE disk from e.g. Atari on a Mac, Amiga or PC wasn't something you'd have antcipated at that time. Floppy disks were for data interchange. Cheers,     Michael > > Richard