linux-kernel - Re: Simple UART driver help and TTY questions

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Message-ID: <4898C44E.7020303@gmail.com>
Date:	Tue, 05 Aug 2008 23:21:18 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Ira Snyder <iws@...o.caltech.edu>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Simple UART driver help and TTY questions

On 08/05/2008 06:33 PM, Ira Snyder wrote:
> Hello LKML,
> So, the problem I have is that when I install this driver, it seems to
> return -EIO before it even hits any of the driver code. I checked this
> by putting a printk at the beginning of every function call in the
> module.
> 
> The error from busybox microcom is this:
> microcom: can't tcsetattr for /dev/ttytiny0: Input/output error
> 
> And cat /dev/ttytiny0:
> cat: /dev/ttytiny0: Input/output error
> 
> Previously to finding this code from LinuxJournal, I had tried to write
> my own skeleton driver, basing it on the drivers/serial/ucc_uart.c code.
> It has the exact same problem. I've attached it as well.
> 
> So, to the best of my research, it seems like the tcsetattr call would
> come in at drivers/char/tty_ioctl.c in tty_mode_ioctl() (the TCSETS
> case). Maybe I'm wrong, though.
> 
> I've built it against both ubuntu's stock kernel (2.6.24 based) and a
> recent pull of the kernel.org kernel.
> 
> I'd really appreciate help figuring out what this problem is.

Attach straces of your tries.
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