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List:       gpsd-dev
Subject:    [Gpsd-dev] pl2303 freeze on OpenWRT RC5
From:       gpsd-dev () lists ! berlios ! de (Michael R !  Davis)
Date:       2006-06-11 4:48:53
Message-ID: 20060611044853.80485.qmail () web32508 ! mail ! mud ! yahoo ! com
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--- "Eric S. Raymond" <esr@thyrsus.com> wrote:
> Can you give me more details about this?  
See: http://gpsd.davisnetworks.com/bin/view/Main/FreezeBugPL2303
Interesting that gpsd does not freeze the system.  When I first had
this issue I thought that it was related to openwrt use of cat from
buzybox is not the "real" cat that can read from devices. But, it may
be related to the pl2303 module. Most likely, openwrt doesn't set some
serial parameter that is needed by pl2303 module. 

> What was the last version of the driver that had this bug?  
The pl2303 driver is from the kernel source of 2.4.30.

> Is there a recipe for reproducing it that is reliable?
Yep, reboot without any port setting software then 'cat /dev/usb/tts/0'

Mike (mrdvt92)

--- "Eric S. Raymond" <esr@thyrsus.com> wrote:

> Michael R. Davis <mrdvt92@yahoo.com>:
> > Til,
> > I had a similar experience on MIP arch with the pl2303 driver.  I
> think
> > there must be some bug in pl2303 module.  If you read from the
> device
> > at the wrong rate (e.g. cat /dev/xxx) it will lock up.  On openwrt
> it
> > required a hard reboot.  I have since put stty /dev/xxx 4800 in my
> init
> > before any reading.  Haven't check it since a recent upgrade.
> > Mike
> 
> Can you give me more details about this?  What was the last version
> of the 
> driver that had this bug?  Is there a recipe for reproducing it that
> is reliable?
> 
> I want to document this under "Bugs exposed by gpsd in other
> software", but I think wee'd get rightly thumped for posting a
> complaint
> as vague as the above.
> 
> I'm also not sure of Til's status.  You report getting fuser to work;
> is the hunt still failing to lock on 7N1?  Have you a lock that
> exhibits
> this failure reliably?
> -- 
> 		<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
> _______________________________________________
> Gpsd-dev mailing list
> Gpsd-dev@lists.berlios.de
> http://lists.berlios.de/mailman/listinfo/gpsd-dev
> 


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