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Tue, 15 Jun 2021 00:28:51 +0000 Subject: Re: [PATCH 4/6] imx8m: Restrict usable memory to space below 4G boundary To: Marek Vasut , Frieder Schrempf , Fabio Estevam , Peng Fan , Simon Glass , Ye Li Cc: Frieder Schrempf , "NXP i.MX U-Boot Team" , u-boot@lists.denx.de References: <20210607120534.183091-1-frieder@fris.de> <20210607120534.183091-5-frieder@fris.de> <624a336a-5daf-2623-27d2-2e15b3808ca1@denx.de> From: "Peng Fan (OSS)" Message-ID: <80a57ee9-f932-70db-c37e-80c764f8a6ff@oss.nxp.com> Date: Tue, 15 Jun 2021 08:28:42 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 In-Reply-To: <624a336a-5daf-2623-27d2-2e15b3808ca1@denx.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [119.31.174.71] X-ClientProxiedBy: SGBP274CA0001.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b0::13) To DB6PR0402MB2760.eurprd04.prod.outlook.com (2603:10a6:4:a1::14) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [10.193.102.59] (119.31.174.71) by SGBP274CA0001.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b0::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4219.20 via Frontend Transport; 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Let's make sure U-Boot only ever uses the space below >> the 4G address boundary (which is 3GiB big), even when the effective >> available memory is bigger. >> >> We implement board_get_usable_ram_top() for all i.MX8M SoCs, as the >> whole family is affected by this. > > Shouldn't only those specific IP drivers handle buffers in the 64bit > space somehow ? E.g. using a bounce buffer ? That could cause extra mem copy. Bounce buffer would be good for systems that take U-Boot as UEFI firmware, because U-Boot would be located at high end, but in the middle just top of 4GB. I not object this patch, but it also be good if bounce buffer be added for improvement. Reviewed-by: Peng Fan