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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D8E60CAC59A for ; Fri, 19 Sep 2025 14:23:03 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4cSvqV0Xg5z2yrK; Sat, 20 Sep 2025 00:23:02 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=202.12.124.154 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1758291781; cv=none; b=oakM6h+cEsC1CZZc04j8fC5yoGW+7a1g4JvxTV76HKqJ/gn+HRBl3KAVKoipT3+HG5Q5tgLc+Q7aTkf2HXIpmwn4u74wWV7dZuCsKYLokRXUGghfhQrdGAk7+wK+pZ/GnAD1qk0AgVqme+wv4rDq6L//AOxxUtZLXh1X9sJs/x0IZyhvCiA8HZfNKLSOf2VhMSqNpWO7WXWF1T1Wm0WXpZNJo9e0rqbu+UFWqtCoWdKJE9gZFQmkJLHZj0ZM2UcfSwzi0JoFjDlPh57Gt8fsBEh1SYL+5p8IfP12Te4WPA9Bjc4pWbZswMRC7GA9+fl4uTMyyc6hGPwiN0Jj0697Lw== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1758291781; c=relaxed/relaxed; bh=DGBIXWoQfciFg5TTWblokxBsiewcOE1bszsE8YzDKWM=; h=MIME-Version:Date:From:To:Cc:Message-Id:In-Reply-To:References: Subject:Content-Type; b=CiRj3H65699OzGWbrJNeRT9g97565cyooTTWYefcVXRqt9pBCSydaxAZlMmDo1bUkVPE5V7Jb2IafEGlekbnpWPVEcBZvapEgl4nKDHXrDAWNwJmM66hc9TSDvpBAUVQICfj8yMXTCak9azgq2rgLZaR+VgUAOslmv/2hhcYjsdawIiuwNVHW4Z4RSro/FY+lmKpCBeIzeYDU/o8ELLfSv4X6fmOT8zJ2i+Wilq990buuV6XN+yi9Oz+uuNgIq0KXjM+dEbyhWl3CiaP3gIXyAG1BbnYWQj3NuSX6IBd0EBk4IsCd4owTfiGamShyNLniTtf2uEnwZVFst3HInqZbQ== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=arndb.de; dkim=pass (2048-bit key; unprotected) header.d=arndb.de header.i=@arndb.de header.a=rsa-sha256 header.s=fm1 header.b=3P7vtOxX; dkim=pass (2048-bit key; unprotected) header.d=messagingengine.com header.i=@messagingengine.com header.a=rsa-sha256 header.s=fm1 header.b=NwEFh+Eh; dkim-atps=neutral; spf=pass (client-ip=202.12.124.154; helo=fhigh-b3-smtp.messagingengine.com; envelope-from=arnd@arndb.de; receiver=lists.ozlabs.org) smtp.mailfrom=arndb.de Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=arndb.de Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=arndb.de header.i=@arndb.de header.a=rsa-sha256 header.s=fm1 header.b=3P7vtOxX; dkim=pass (2048-bit key; unprotected) header.d=messagingengine.com header.i=@messagingengine.com header.a=rsa-sha256 header.s=fm1 header.b=NwEFh+Eh; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=arndb.de (client-ip=202.12.124.154; helo=fhigh-b3-smtp.messagingengine.com; envelope-from=arnd@arndb.de; receiver=lists.ozlabs.org) Received: from fhigh-b3-smtp.messagingengine.com (fhigh-b3-smtp.messagingengine.com [202.12.124.154]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4cSvqQ5n7qz2xpn for ; Sat, 20 Sep 2025 00:22:57 +1000 (AEST) Received: from phl-compute-05.internal (phl-compute-05.internal [10.202.2.45]) by mailfhigh.stl.internal (Postfix) with ESMTP id 3BC477A0068; Fri, 19 Sep 2025 10:22:53 -0400 (EDT) Received: from phl-imap-02 ([10.202.2.81]) by phl-compute-05.internal (MEProxy); Fri, 19 Sep 2025 10:22:54 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arndb.de; h=cc :cc:content-transfer-encoding:content-type:content-type:date :date:from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to; s=fm1; t=1758291773; x=1758378173; bh=DGBIXWoQfciFg5TTWblokxBsiewcOE1bszsE8YzDKWM=; b= 3P7vtOxXTlRKZGWlZLsRFVQlQg4bj5SvQvb5v1zmryo4PCz5xUCZ/fSZUuL33qsW 2XFxpoh130HNWVqUH00GYFR2OLcWx0fbXjhyeBAR8yseNvBXLhN/0OOMJL6U3cy9 NOxQGScNJsPb3WM84wfJPFb4rdhDXJNr0eUbkkBFZAqgCNYQVkp1Eolbo7eGfx6T UIhoCwGZmmCD2l9Vdt05U1amomaUxFZDiopcE8Uiha2UPEfSrnPL/cBLPrd/w2SK AOAYXKR8GES89WQNC+kxfLcj7gP5oZndIPzi3FtUM0Qapm2gqlAC8zK00Iux7Czt u3Hzk4X0b7bccGPCfsVDGQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:content-type:date:date:feedback-id:feedback-id :from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm1; t=1758291773; x= 1758378173; bh=DGBIXWoQfciFg5TTWblokxBsiewcOE1bszsE8YzDKWM=; b=N wEFh+Ehq8I5Ne8BUFO132THoMndwZ6szg6zS6b+qZvszYrP+sSryFfqlrr++t+re 52mUZjJS/MqYpcQK4IrqneI3Q+QV87n44m8BdrbXyltTFUsKqWVoFc7LxhztSzR1 /CyOnK6h4cAgGvOrrvZPqQ+kytQaKCIBFxaNl1m4svOmCOmwcwS8Yq4fdKJu928x +iYoSc2Dwk0r2zFgWPLHA2uWyYEEbO2I/L1Q2EIYz5f60VEk6QPi921HwITH7WAh xpt1386OGSe7LQJ7/CDBPPYMPl7W+ZdVVK91Q5wl7+/wWjKCPzRy6B5d7I5vClBH kLIZeQgRg6fEx8N/FKj5Q== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtdeggdegleeggecutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpuffrtefokffrpgfnqfghnecuuegr ihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjug hrpefoggffhffvvefkjghfufgtgfesthejredtredttdenucfhrhhomhepfdetrhhnugcu uegvrhhgmhgrnhhnfdcuoegrrhhnugesrghrnhgusgdruggvqeenucggtffrrghtthgvrh hnpefhtdfhvddtfeehudekteeggffghfejgeegteefgffgvedugeduveelvdekhfdvieen ucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpegrrhhnug esrghrnhgusgdruggvpdhnsggprhgtphhtthhopeeftddpmhhouggvpehsmhhtphhouhht pdhrtghpthhtoheptghhvghsthgvrhdrrgdruhhnrghlsegrrhhinhgtledrtghomhdprh gtphhtthhopegthhhrihhsthhophhhvgdrlhgvrhhohiestghsghhrohhuphdrvghupdhr tghpthhtoheprghnughrvggrshesghgrihhslhgvrhdrtghomhdprhgtphhtthhopehgvg gvrhhtodhrvghnvghsrghssehglhhiuggvrhdrsggvpdhrtghpthhtoheprghlvgigrghn uggvrhdrshhvvghrughlihhnsehgmhgrihhlrdgtohhmpdhrtghpthhtohepshgvrhhgih hordhprghrrggtuhgvlhhlohhssehgmhgrihhlrdgtohhmpdhrtghpthhtohepshhurhgv nhgssehgohhoghhlvgdrtghomhdprhgtphhtthhopeifihhllhihsehinhhfrhgruggvrg gurdhorhhgpdhrtghpthhtohepihhrrgdrfigvihhnhiesihhnthgvlhdrtghomh X-ME-Proxy: Feedback-ID: i56a14606:Fastmail Received: by mailuser.phl.internal (Postfix, from userid 501) id 04B80700098; Fri, 19 Sep 2025 10:22:51 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 X-ThreadId: AneuvEk2E7Kg Date: Fri, 19 Sep 2025 16:22:20 +0200 From: "Arnd Bergmann" To: "Geert Uytterhoeven" Cc: "Jason Gunthorpe" , ksummit@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, imx@lists.linux.dev, "Christophe Leroy" , "Richard Weinberger" , "Lucas Stach" , "Linus Walleij" , "Geert Uytterhoeven" , "Ankur Arora" , "David Hildenbrand" , "Mike Rapoport" , "Lorenzo Stoakes" , "Matthew Wilcox" , "Andrew Morton" , "Liam R. Howlett" , "Vlastimil Babka" , "Suren Baghdasaryan" , "Ira Weiny" , "Nishanth Menon" , =?UTF-8?Q?Heiko_St=C3=BCbner?= , "Alexander Sverdlin" , "Chester A. Unal" , "Sergio Paracuellos" , "Andreas Larsson" Message-Id: <547dcb81-434d-4910-aa7c-1d69019fcb3d@app.fastmail.com> In-Reply-To: References: <4ff89b72-03ff-4447-9d21-dd6a5fe1550f@app.fastmail.com> <20250917125951.GA1390993@nvidia.com> <02b0f383-1c43-4eeb-a76f-830c2970b833@app.fastmail.com> Subject: Re: [TECH TOPIC] Reaching consensus on CONFIG_HIGHMEM phaseout Content-Type: text/plain Content-Transfer-Encoding: 7bit On Fri, Sep 19, 2025, at 09:17, Geert Uytterhoeven wrote: > On Thu, 18 Sept 2025 at 15:13, Arnd Bergmann wrote: >> On Wed, Sep 17, 2025, at 14:59, Jason Gunthorpe wrote: >> > On Tue, Sep 09, 2025 at 11:23:37PM +0200, Arnd Bergmann wrote: > >> * Microchip SAM9x7 is the newest ARMv5 chip, clearly does >> get kernel updates, and the only one I can think of with >> DDR3 support, but seems to be limited to 256MB total memory. > > Are they limited to DDR3? > > IIRC, someone (you? ;-) told me at ELCE that Microchip keeps on spinning > new variants of old SoCs, to accommodate the changing DDR landscape > and market. So perhaps they also accept larger RAM sizes? Yes, that was me. The previous SAM9x60 was released in 2020 and I think that one was an upgrade to a smaller process node, raising the clock frequency to 600MHz and adding more modern peripherals, but I see now that this used the same SDRAM/LPDDR/DDR2 memory controller as previous chips, with a limit of 128MB total DRAM. SAM9X7 in 2023 added DDR3 mode with up to 256MB according to the datasheet, no idea why they chose not to support more, since a 32-bit wide DDR3 bus should allow up to 1GB with two 256Mbit x16 chips that are widely available, or even more using expensive 512Mbit x16 or 1Gbit x8 chips. Arnd