From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751261AbWDYGWc (ORCPT ); Tue, 25 Apr 2006 02:22:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751301AbWDYGWb (ORCPT ); Tue, 25 Apr 2006 02:22:31 -0400 Received: from lon-del-01.spheriq.net ([195.46.50.97]:46004 "EHLO lon-del-01.spheriq.net") by vger.kernel.org with ESMTP id S1751261AbWDYGWa convert rfc822-to-8bit (ORCPT ); Tue, 25 Apr 2006 02:22:30 -0400 From: Manish RATHI To: Subject: query regarding serial driver for ARM Date: Tue, 25 Apr 2006 11:52:13 +0530 Message-ID: <003901c66830$97a4b2b0$802cc70a@dlh.st.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8BIT X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.5709 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 X-O-Spoofed: Not Scanned X-O-General-Status: No X-O-Spam1-Status: Not Scanned X-O-Spam2-Status: Not Scanned X-O-URL-Status: Not Scanned X-O-Virus1-Status: No X-O-Virus2-Status: Not Scanned X-O-Virus3-Status: No X-O-Virus4-Status: No X-O-Virus5-Status: Not Scanned X-O-Image-Status: Not Scanned X-O-Attach-Status: Not Scanned X-SpheriQ-Ver: 4.2.01 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, I am loosing characters in serial transfer in case user buffer size is very small. This loss is due to tty buffer overflow. I am using pl1011 serial driver. Hardware provided hardware flow control (RTS/CTS) based on FIFO thresholds. At the same time software also control the RTS/CTS pins in case of uart_throttle i.e. tty buffer overflow. In my hardware, software control of pins is not possible if it's already done by hardware. So effectilvely uart_throttle() defined in serial driver core framework function has no effect. Can anybody help me in this regard? Regards Manish