[{"id":3676180,"web_url":"http://patchwork.ozlabs.org/comment/3676180/","msgid":"","list_archive_url":null,"date":"2026-04-11T16:28:36","subject":"Re: [PATCH v3 2/5] m68k: Fix writew(), writel(), readw(), readl()\n endianness for classic m68k","submitter":{"id":6170,"url":"http://patchwork.ozlabs.org/api/people/6170/","name":"Simon Glass","email":"sjg@chromium.org"},"content":"On 2026-04-08T22:09:23, Daniel Palmer wrote:\n> m68k: Fix writew(), writel(), readw(), readl() endianness for classic m68k\n>\n> In Linux these are meant to read a little-endian value and swap\n> to the CPU endian.\n>\n> In u-boot for m68k this is currently broken and prevents\n> virtio-mmio from functioning.\n>\n> This change is only for classic m68k. Coldfire has read big-endian,\n> no swap for these in u-boot and Linux and existing drivers probably\n> depend on this.\n>\n> Signed-off-by: Daniel Palmer \n>\n> arch/m68k/include/asm/io.h | 31 ++++++++++++++++++++-----------\n> 1 file changed, 20 insertions(+), 11 deletions(-)\n\nReviewed-by: Simon Glass ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=chromium.org header.i=@chromium.org header.a=rsa-sha256\n header.s=google header.b=ASrIxBs7;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=chromium.org","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=chromium.org header.i=@chromium.org\n header.b=\"ASrIxBs7\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=chromium.org","phobos.denx.de;\n spf=pass smtp.mailfrom=sjg@chromium.org"],"Received":["from phobos.denx.de (phobos.denx.de\n [IPv6:2a01:238:438b:c500:173d:9f52:ddab:ee01])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4ftJyx2m1lz1yGb\n\tfor ; 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Sat, 11 Apr 2026\n 09:28:58 -0700 (PDT)","MIME-Version":"1.0","References":"<20260408220928.3328551-1-daniel@thingy.jp>\n <20260408220928.3328551-3-daniel@thingy.jp>","In-Reply-To":"<20260408220928.3328551-3-daniel@thingy.jp>","From":"Simon Glass ","Date":"Sat, 11 Apr 2026 10:28:36 -0600","X-Gm-Features":"AQROBzCYb5Ny5X0_rs5BYrzFrPnckqeoQCQy0qpOlFw2vNwaV2PwwPu4p50t24U","Message-ID":"\n ","Subject":"Re: [PATCH v3 2/5] m68k: Fix writew(), writel(), readw(), readl()\n endianness for classic m68k","To":"daniel@thingy.jp","Cc":"visitorckw@gmail.com, angelo@kernel-space.org, bmeng.cn@gmail.com,\n u-boot@lists.denx.de","Content-Type":"text/plain; charset=\"UTF-8\"","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}},{"id":3676206,"web_url":"http://patchwork.ozlabs.org/comment/3676206/","msgid":"","list_archive_url":null,"date":"2026-04-11T21:07:36","subject":"Re: [PATCH v3 2/5] m68k: Fix writew(), writel(), readw(), readl()\n endianness for classic m68k","submitter":{"id":85702,"url":"http://patchwork.ozlabs.org/api/people/85702/","name":"Angelo Dureghello","email":"angelo@kernel-space.org"},"content":"Tested-by: Angelo Dureghello \n\n\nit's mainly ok, btw, since you need still probably a v4,\nsee below:\n\nOn 4/9/26 00:09, Daniel Palmer wrote:\n> In Linux these are meant to read a little-endian value and swap\n> to the CPU endian.\n> \n> In u-boot for m68k this is currently broken and prevents\n> virtio-mmio from functioning.\n> \n> This change is only for classic m68k. Coldfire has read big-endian,\n> no swap for these in u-boot and Linux and existing drivers probably\n> depend on this.\n> \n> Signed-off-by: Daniel Palmer \n> ---\n> arch/m68k/include/asm/io.h | 31 ++++++++++++++++++++-----------\n> 1 file changed, 20 insertions(+), 11 deletions(-)\n> \n> diff --git a/arch/m68k/include/asm/io.h b/arch/m68k/include/asm/io.h\n> index 35ad4a1c0444..2577081d8363 100644\n> --- a/arch/m68k/include/asm/io.h\n> +++ b/arch/m68k/include/asm/io.h\n> @@ -23,18 +23,27 @@\n> #define __raw_writew(w,addr) ((*(volatile u16 *) (addr)) = (w))\n> #define __raw_writel(l,addr) ((*(volatile u32 *) (addr)) = (l))\n> \n> -#define readb(addr)\t\tin_8((volatile u8 *)(addr))\n> -#define writeb(b,addr)\t\tout_8((volatile u8 *)(addr), (b))\n> -#if !defined(__BIG_ENDIAN)\n> -#define readw(addr)\t\t(*(volatile u16 *) (addr))\n> -#define readl(addr)\t\t(*(volatile u32 *) (addr))\n> -#define writew(b,addr)\t\t((*(volatile u16 *) (addr)) = (b))\n> -#define writel(b,addr)\t\t((*(volatile u32 *) (addr)) = (b))\n> +#define readb(addr)\tin_8((volatile u8 *)(addr))\n> +#define writeb(b, addr)\tout_8((volatile u8 *)(addr), (b))\n> +#ifdef CONFIG_M680x0\n> +/*\n> + * For classic m68k these work the same way as Linux:\n> + * Read a little endian value, swap to the CPU endian.\n> + */\n> +#define readw(addr)\tin_le16((volatile u16 *)(addr))\n> +#define readl(addr)\tin_le32((volatile u32 *)(addr))\n> +#define writew(b, addr)\tout_le16((volatile u16 *)(addr), (b))\n> +#define writel(b, addr)\tout_le32((volatile u32 *)(addr), (b))\n\nMy understanding is that, even if m68k is big endian, you need \nLE r/w for usage with virtio. \n\nWould M680x0 non-qemu work still with this change ?\nMaybe an #if defined (CONFIG_VIRTIO) && defined(CONFIG_M680x0)\nwould be better ?\n\n\n> #else\n> -#define readw(addr)\t\tin_be16((volatile u16 *)(addr))\n> -#define readl(addr)\t\tin_be32((volatile u32 *)(addr))\n> -#define writew(b,addr)\t\tout_be16((volatile u16 *)(addr),(b))\n> -#define writel(b,addr)\t\tout_be32((volatile u32 *)(addr),(b))\n> +/*\n> + * For coldfire these read a big endian value and use it\n> + * as-is. This means that for little endian devices on the\n> + * bus like PCI device these won't work as expected currently.\n> + */\n> +#define readw(addr)\tin_be16((volatile u16 *)(addr))\n> +#define readl(addr)\tin_be32((volatile u32 *)(addr))\n> +#define writew(b, addr)\tout_be16((volatile u16 *)(addr), (b))\n> +#define writel(b, addr)\tout_be32((volatile u32 *)(addr), (b))\n> #endif\n> \n> /*\n\nRegards,\n-- Angelo","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=kernel-space.org header.i=@kernel-space.org\n header.a=rsa-sha256 header.s=s1 header.b=TQIeqQBA;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=reject dis=none) header.from=kernel-space.org","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=kernel-space.org header.i=@kernel-space.org\n header.b=\"TQIeqQBA\";\n\tdkim-atps=neutral","phobos.denx.de; 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charset=UTF-8","Content-Transfer-Encoding":"7bit","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}},{"id":3676223,"web_url":"http://patchwork.ozlabs.org/comment/3676223/","msgid":"","list_archive_url":null,"date":"2026-04-12T00:59:13","subject":"Re: [PATCH v3 2/5] m68k: Fix writew(), writel(), readw(), readl()\n endianness for classic m68k","submitter":{"id":85408,"url":"http://patchwork.ozlabs.org/api/people/85408/","name":"Daniel Palmer","email":"daniel@thingy.jp"},"content":"Hi Angelo,\n\nOn Sun, 12 Apr 2026 at 06:07, Angelo Dureghello wrote:\n\n> Would M680x0 non-qemu work still with this change ?\n> Maybe an #if defined (CONFIG_VIRTIO) && defined(CONFIG_M680x0)\n> would be better ?\n\nI think we need this change even for non-virtio. The bug just showed\nup because of virtio.\nI think this would have shown up if/when PCI support is added. I have\nPCI on my Amiga working in Linux so that's not totally impossible. :)\n\nCheers,\n\nDaniel","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=thingy.jp header.i=@thingy.jp header.a=rsa-sha256\n header.s=google header.b=fjrIjp9K;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=none (p=none dis=none) header.from=thingy.jp","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=thingy.jp header.i=@thingy.jp header.b=\"fjrIjp9K\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=none (p=none dis=none) header.from=thingy.jp","phobos.denx.de; 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