From: Michael Hanselmann <linux-kernel@hansmi.ch>
To: Russell King <rmk+lkml@arm.linux.org.uk>
Cc: linux-serial@vger.kernel.org
Subject: Re: Hang in uart_block_til_ready()
Date: Sun, 2 Apr 2006 17:42:40 +0200 [thread overview]
Message-ID: <20060402154240.GB402@hansmi.ch> (raw)
In-Reply-To: <20060402152350.GA5283@flint.arm.linux.org.uk>
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On Sun, Apr 02, 2006 at 04:23:50PM +0100, Russell King wrote:
> Have you checked the state of the DCD line in both cases? Look in
> /proc/tty/driver/serial.
HP box:
2: uart:16550A port:000003E8 irq:4 tx:12888 rx:147 RTS|CTS|DTR|DSR
other box:
0: uart:16550A port:000003F8 irq:4 tx:18886 rx:299 RTS|CTS|DTR|DSR|CD
So, yes. The other box has CD set (unless CD is not DCD). It might be
that the serial cable used there does this, but I can't check it because
the box is several hundreds of kilometers away.
> Probably "works" on the first box because it happens to have DCD asserted
> on the real serial port.
Yes, that explains it.
Thanks for your help,
Michael
--
Gentoo Linux developer, http://hansmi.ch/, http://forkbomb.ch/
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prev parent reply other threads:[~2006-04-02 15:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-02 13:51 Hang in uart_block_til_ready() Michael Hanselmann
2006-04-02 14:38 ` Russell King
2006-04-02 15:17 ` Michael Hanselmann
2006-04-02 15:23 ` Russell King
2006-04-02 15:42 ` Michael Hanselmann [this message]
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