From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 304601A1E4F for ; Tue, 18 Oct 2016 19:10:44 -0700 (PDT) Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga105.fm.intel.com with ESMTP; 18 Oct 2016 19:10:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,364,1473145200"; d="scan'208";a="891451495" Received: from fmsmsx103.amr.corp.intel.com ([10.18.124.201]) by orsmga003.jf.intel.com with ESMTP; 18 Oct 2016 19:10:43 -0700 Received: from fmsmsx119.amr.corp.intel.com (10.18.124.207) by FMSMSX103.amr.corp.intel.com (10.18.124.201) with Microsoft SMTP Server (TLS) id 14.3.248.2; Tue, 18 Oct 2016 19:10:43 -0700 Received: from shsmsx152.ccr.corp.intel.com (10.239.6.52) by FMSMSX119.amr.corp.intel.com (10.18.124.207) with Microsoft SMTP Server (TLS) id 14.3.248.2; Tue, 18 Oct 2016 19:10:42 -0700 Received: from shsmsx101.ccr.corp.intel.com ([169.254.1.104]) by SHSMSX152.ccr.corp.intel.com ([169.254.6.2]) with mapi id 14.03.0248.002; Wed, 19 Oct 2016 10:10:41 +0800 From: "Tian, Feng" To: Heyi Guo , "edk2-devel@lists.01.org" CC: "Zeng, Star" , "Tian, Feng" Thread-Topic: [edk2] Why is USB_BOOT_IO_BLOCKS set to 128? Thread-Index: AQHSKawxE4FNE1/VUU6j/tS10F5O2aCvCEAw Date: Wed, 19 Oct 2016 02:10:40 +0000 Message-ID: <7F1BAD85ADEA444D97065A60D2E97EE566E3700D@SHSMSX101.ccr.corp.intel.com> References: <47a8c44f-e72f-a993-a0a0-0ee38d2735d3@linaro.org> In-Reply-To: <47a8c44f-e72f-a993-a0a0-0ee38d2735d3@linaro.org> Accept-Language: zh-CN, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.239.127.40] MIME-Version: 1.0 Subject: Re: Why is USB_BOOT_IO_BLOCKS set to 128? X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Oct 2016 02:10:44 -0000 Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable It's just an experience value and has been here about 10 years... Which usb brand/model name do you have problem on? Thanks Feng -----Original Message----- From: Heyi Guo [mailto:heyi.guo@linaro.org]=20 Sent: Wednesday, October 19, 2016 9:57 AM To: edk2-devel@lists.01.org Cc: Tian, Feng ; Zeng, Star Subject: [edk2] Why is USB_BOOT_IO_BLOCKS set to 128? Dear experts, Could anyone help to explain why USB_BOOT_IO_BLOCKS in MdeModulePkg/Bus/Usb= /UsbMassStorageDxe/UsbMassBoot.h is set to 128? We found on some platforms this value may cause USB boot failure and *64* blocks will make them work. Though we have not got the final root caus= e, it will be really helpful if you can tell the reason of setting it to 12= 8 and possible root cause for such issue. Thanks and regards, Heyi