From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-x22d.google.com (mail-pf0-x22d.google.com [IPv6:2607:f8b0:400e:c00::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 56A501A1E56 for ; Tue, 18 Oct 2016 18:57:41 -0700 (PDT) Received: by mail-pf0-x22d.google.com with SMTP id e6so6264536pfk.3 for ; Tue, 18 Oct 2016 18:57:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=to:cc:from:subject:message-id:date:user-agent:mime-version :content-transfer-encoding; bh=r5hnWaZBEQ5tNI/Db9XZEWvV7JhHVp/9GPP3txlWFeg=; b=MlPonwyCk41MUNm8eSC6XriqZp0pGuZ3rDmpB9OfipV9AIFuC3RM0cC7N/r5/9GnhN 3QUrfcZbHOrGwxCynbcSmQOCvd9sLLlebErjIefgC/ZQSOuxvaAT8w/mbxMCkuP7oNCp FCfpxPPngWhekl54GwFXyz79MKey5c3ov171E= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:to:cc:from:subject:message-id:date:user-agent :mime-version:content-transfer-encoding; bh=r5hnWaZBEQ5tNI/Db9XZEWvV7JhHVp/9GPP3txlWFeg=; b=V6vh+jWs4NIk777u1ZFlfGxkZeAK+5Gegbj9OvTaqO9/kLLRmanh9GySKTMedlod19 /Qq+laVbvJiBekv08pgv4dFJakUD9SCZ/u9pdjDTPpTZymWX+5ZrVmsMCC5wRCK6r8T+ 7S8UuM2t+9WxpxxxlawZBgWM6heoThetspJqyxhugqZp2ZayGawCXf39fH3UmR22ClaV /VFpbwEAIwhGeB/CY7rsWUC6H+a5G9O46Gv2rvC/SA69lwo5Si1Hgty28zYhJRQ5smFo MBx1/4+2++SRK2xTWsqzOF3Q8E1hNz4L0+9S1oJcZxBN7dRIoRhOqy0HmMN7z2BmGUVC 43VQ== X-Gm-Message-State: AA6/9Rl/+GVJfRlXJccsx7sdCcZ8SfobpwSs359y+c6awZMIaK2x8rLAL4E6fBwEDZNdIHpz X-Received: by 10.99.166.17 with SMTP id t17mr4999568pge.102.1476842260976; Tue, 18 Oct 2016 18:57:40 -0700 (PDT) Received: from [10.229.36.249] ([119.145.15.121]) by smtp.gmail.com with ESMTPSA id oo10sm55556096pac.12.2016.10.18.18.57.39 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 18 Oct 2016 18:57:40 -0700 (PDT) To: edk2-devel@lists.01.org Cc: feng.tian@intel.com, star.zeng@intel.com From: Heyi Guo Message-ID: <47a8c44f-e72f-a993-a0a0-0ee38d2735d3@linaro.org> Date: Wed, 19 Oct 2016 09:57:05 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 Subject: 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 01:57:41 -0000 Content-Type: text/plain; charset=gbk; format=flowed Content-Transfer-Encoding: 7bit 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 cause, it will be really helpful if you can tell the reason of setting it to 128 and possible root cause for such issue. Thanks and regards, Heyi