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Message-ID: <489A1364.4020809@gmail.com>
Date: Wed, 06 Aug 2008 23:11:00 +0200
From: Jiri Slaby <jirislaby@gmail.com>
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To: Ira Snyder <iws@ovro.caltech.edu>
CC: linux-kernel@vger.kernel.org
Subject: Re: Simple UART driver help and TTY questions
References: <20080805163307.GJ6257@ovro.caltech.edu>
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conOn 08/05/2008 06:33 PM, Ira Snyder wrote:
> static void tiny_config_port(struct uart_port *port, int flags)
> {
> 	FUNC_ENTER();

         if (flags & UART_CONFIG_TYPE)
                 port->type = PORT_16550A;

> }

According to the straces, you get -EIO from ioctl and read which most likely 
means TTY_IO_ERROR bit set due to tiny_port->type = PORT_UNKNOWN (i.e. 0). Try 
the above.
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