From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f170.google.com (mail-pf1-f170.google.com [209.85.210.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1D4EF1CDA3E for ; Thu, 3 Oct 2024 22:41:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.170 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727995282; cv=none; b=M9515//nJY73MnfzeucJeDNX6vycZW2Cm7pe9sEIyjmDwYYQhTwgxS/AKWzwymx1O4Q9xwz3sIlnF175AVOLlVouPQnP65dEkZTv4j6Tg2BQKbOwJP1e1MzFMQCCP8Q52Hd8G8LCh//ZiND/H3LG5eA3F2br2YD4yBxGUq8MRjU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727995282; c=relaxed/simple; bh=Jo3jTu3gvdSY4hclX5Ayw7O/TbUjLGTC5b1dS6kU29Y=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=PWUPEHy12LiyOuA6O/qFMsS8qRbG8BYVAR9Ufm9P13TCsQVTFpqGwk3oAqWJfeUwO/wWn1mf6zlcZJZkeryojYv6KCIEWNeLMSKTDseEWm+JRaMjSC6aGEcKeci1EycMWnbSrQxx+zqSHZ7LC+xcj4sfpkJKfnJTufQO2U0p3n4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com; spf=fail smtp.mailfrom=broadcom.com; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b=fTOuRgmB; arc=none smtp.client-ip=209.85.210.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=broadcom.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="fTOuRgmB" Received: by mail-pf1-f170.google.com with SMTP id d2e1a72fcca58-718d91eef2eso1115395b3a.1 for ; Thu, 03 Oct 2024 15:41:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1727995280; x=1728600080; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to; bh=JOOuScGzdxC4cr8jo6Z6y0fx9Os2Ix83Ys4a8jeW6gM=; b=fTOuRgmBnvVSlFdJhJM4WkQOhmWD0P7FVSYLbgoc/MI3WtZ2KRdIev/mU/H812I07V bbryA64zk2te6O5w3D9nCp30umpegWI7EYwWOtTcjGBUTO9V/ALmGfwRqbbrG/XHf3e2 +sfbTTVUH1UCmA0MTwqHDm9x61UXjT1vALTHA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727995280; x=1728600080; h=content-transfer-encoding:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=JOOuScGzdxC4cr8jo6Z6y0fx9Os2Ix83Ys4a8jeW6gM=; b=nO4/EIK3aBNhSddkVzCu4Mo2+ytmmFX47uyI12F5W9tZlJ6l15o2KGH3kPN8kCtJeT dQSHyI4FEZ2YUdpLOmr5KavrCU61FaWmXyUsODyzZg8V4JfxTUrXjrWdBZZQUhD8voUD AXLpStCd8hI01VCD/sZBHpj691rz5QvUx6wy7Qlrnb/BKArcllZ26jyX+5HhJKuBMCna 8sucnB+Pd9I12qbNW8k8DMmYgrBgqlBasAG0xFqmUjtMc045AsmgaRS3LRp4aVoy9bmU XimSAiK8+BbFAVMBqPqLjfDeojT1zBLHCYs1g6vBk6Mo0po0Ku2nrz7mi56WAp6R24IT 8Iqg== X-Forwarded-Encrypted: i=1; AJvYcCXnCwWKbZq7AI3JHOgB/xMt1qcMJ17eCylOVu+LCCcKrzy1+/q+qrnqdAlyTsFhjFl8dpSvGqTh63JrSbo=@vger.kernel.org X-Gm-Message-State: AOJu0Yz3SYGsLntFXJABwkfGd6Vkurd8TtJlgSLm7NlGpRZEMjtLEhQv dZDt+Sv8hzM+h3/Crl4mxhAEPXoiM8LNUop82i29o9uXGQUmDnK0c5dIXcYrEA== X-Google-Smtp-Source: AGHT+IFVLgJFz8v9YeM8XoaHbIFpThc32hUC+mhSnSMer2REsIA3MjrBBIVcUPSsCAEWNGVm4/h5tw== X-Received: by 2002:a05:6a00:9495:b0:718:d4e4:a10a with SMTP id d2e1a72fcca58-71dd5af2450mr7405946b3a.4.1727995280413; Thu, 03 Oct 2024 15:41:20 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71dd9def29fsm1899168b3a.155.2024.10.03.15.41.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Oct 2024 15:41:19 -0700 (PDT) Message-ID: <78f25b22-f35b-4183-baec-7ddc0c5e3fda@broadcom.com> Date: Thu, 3 Oct 2024 15:41:17 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm64: dts: broadcom: bcmbca: bcm4908: Reserve CFE stub area To: Sam Edwards , =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= , William Zhang , Anand Gore , Kursad Oney Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Broadcom internal kernel review list , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20241003213007.1339811-1-CFSworks@gmail.com> Content-Language: en-US From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; keydata= xsBNBFPAG8ABCAC3EO02urEwipgbUNJ1r6oI2Vr/+uE389lSEShN2PmL3MVnzhViSAtrYxeT M0Txqn1tOWoIc4QUl6Ggqf5KP6FoRkCrgMMTnUAINsINYXK+3OLe7HjP10h2jDRX4Ajs4Ghs JrZOBru6rH0YrgAhr6O5gG7NE1jhly+EsOa2MpwOiXO4DE/YKZGuVe6Bh87WqmILs9KvnNrQ PcycQnYKTVpqE95d4M824M5cuRB6D1GrYovCsjA9uxo22kPdOoQRAu5gBBn3AdtALFyQj9DQ KQuc39/i/Kt6XLZ/RsBc6qLs+p+JnEuPJngTSfWvzGjpx0nkwCMi4yBb+xk7Hki4kEslABEB AAHNMEZsb3JpYW4gRmFpbmVsbGkgPGZsb3JpYW4uZmFpbmVsbGlAYnJvYWRjb20uY29tPsLB IQQQAQgAywUCZWl41AUJI+Jo+hcKAAG/SMv+fS3xUQWa0NryPuoRGjsA3SAUAAAAAAAWAAFr ZXktdXNhZ2UtbWFza0BwZ3AuY29tjDAUgAAAAAAgAAdwcmVmZXJyZWQtZW1haWwtZW5jb2Rp bmdAcGdwLmNvbXBncG1pbWUICwkIBwMCAQoFF4AAAAAZGGxkYXA6Ly9rZXlzLmJyb2FkY29t Lm5ldAUbAwAAAAMWAgEFHgEAAAAEFQgJChYhBNXZKpfnkVze1+R8aIExtcQpvGagAAoJEIEx tcQpvGagWPEH/2l0DNr9QkTwJUxOoP9wgHfmVhqc0ZlDsBFv91I3BbhGKI5UATbipKNqG13Z TsBrJHcrnCqnTRS+8n9/myOF0ng2A4YT0EJnayzHugXm+hrkO5O9UEPJ8a+0553VqyoFhHqA zjxj8fUu1px5cbb4R9G4UAySqyeLLeqnYLCKb4+GklGSBGsLMYvLmIDNYlkhMdnnzsSUAS61 WJYW6jjnzMwuKJ0ZHv7xZvSHyhIsFRiYiEs44kiYjbUUMcXor/uLEuTIazGrE3MahuGdjpT2 IOjoMiTsbMc0yfhHp6G/2E769oDXMVxCCbMVpA+LUtVIQEA+8Zr6mX0Yk4nDS7OiBlvOwE0E U8AbwQEIAKxr71oqe+0+MYCc7WafWEcpQHFUwvYLcdBoOnmJPxDwDRpvU5LhqSPvk/yJdh9k 4xUDQu3rm1qIW2I9Puk5n/Jz/lZsqGw8T13DKyu8eMcvaA/irm9lX9El27DPHy/0qsxmxVmU pu9y9S+BmaMb2CM9IuyxMWEl9ruWFS2jAWh/R8CrdnL6+zLk60R7XGzmSJqF09vYNlJ6Bdbs MWDXkYWWP5Ub1ZJGNJQ4qT7g8IN0qXxzLQsmz6tbgLMEHYBGx80bBF8AkdThd6SLhreCN7Uh IR/5NXGqotAZao2xlDpJLuOMQtoH9WVNuuxQQZHVd8if+yp6yRJ5DAmIUt5CCPcAEQEAAcLB gQQYAQIBKwUCU8AbwgUbDAAAAMBdIAQZAQgABgUCU8AbwQAKCRCTYAaomC8PVQ0VCACWk3n+ obFABEp5Rg6Qvspi9kWXcwCcfZV41OIYWhXMoc57ssjCand5noZi8bKg0bxw4qsg+9cNgZ3P N/DFWcNKcAT3Z2/4fTnJqdJS//YcEhlr8uGs+ZWFcqAPbteFCM4dGDRruo69IrHfyyQGx16s CcFlrN8vD066RKevFepb/ml7eYEdN5SRALyEdQMKeCSf3mectdoECEqdF/MWpfWIYQ1hEfdm C2Kztm+h3Nkt9ZQLqc3wsPJZmbD9T0c9Rphfypgw/SfTf2/CHoYVkKqwUIzI59itl5Lze+R5 wDByhWHx2Ud2R7SudmT9XK1e0x7W7a5z11Q6vrzuED5nQvkhAAoJEIExtcQpvGagugcIAJd5 EYe6KM6Y6RvI6TvHp+QgbU5dxvjqSiSvam0Ms3QrLidCtantcGT2Wz/2PlbZqkoJxMQc40rb fXa4xQSvJYj0GWpadrDJUvUu3LEsunDCxdWrmbmwGRKqZraV2oG7YEddmDqOe0Xm/NxeSobc MIlnaE6V0U8f5zNHB7Y46yJjjYT/Ds1TJo3pvwevDWPvv6rdBeV07D9s43frUS6xYd1uFxHC 7dZYWJjZmyUf5evr1W1gCgwLXG0PEi9n3qmz1lelQ8lSocmvxBKtMbX/OKhAfuP/iIwnTsww 95A2SaPiQZA51NywV8OFgsN0ITl2PlZ4Tp9hHERDe6nQCsNI/Us= In-Reply-To: <20241003213007.1339811-1-CFSworks@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/3/24 14:30, Sam Edwards wrote: > The CFE bootloader places a stub program at 0x0000-0xFFFF to hold the > secondary CPUs until the boot CPU writes the release address. If Linux > overwrites this program before execution reaches smp_prepare_cpus(), the > secondary CPUs may become inaccessible. > > This is only a problem with CFE, and then only until the secondary CPUs > are brought online. However, since it is such a small amount of memory, > it is easiest to reserve it unconditionally. > > Therefore, add a /reserved-memory node to bcm4908.dtsi to protect this > critical memory region. > > Signed-off-by: Sam Edwards Not objecting to the solution, but should not this be moved to a per-board DTS given that there are boards using CFE, and some using u-boot + ARM TF that are unlikely to suffer from that problem? -- Florian