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From: papa@bacall.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Probably SERIAL.DEVICE bug.
Message-ID: <2409@bacall.UUCP>
Date: Sat, 2-May-87 03:25:43 EDT
Article-I.D.: bacall.2409
Posted: Sat May  2 03:25:43 1987
Date-Received: Fri, 8-May-87 05:45:16 EDT
References: <8704300002.AA28012@cory.Berkeley.EDU>
Organization: CS&CE Depts, U.S.C., Los Angeles, CA
Lines: 38


 Matt Dillon writes:
> 	I think I've found a bug in the serial.device ... You can crash your
> Amiga by doing the following:
> 
> 	-Set terminal program and modem @ 1200 baud
> 	-	Make sure it is NOT using the RAD_BOOGIE bit
> 	-Tell modem to send it's help screen (or test chars..) continuously.
> 	-While the modem is sendin, change the baud rate of the terminal
> 	 program (and thus serial.device) to 20000
> 
> 	Your Amiga should freeze up.  Using RAD_BOOGIE seems to fix the
> the problem.  This is a *real* bug because it would seem that changing the
> the baud rate to anything, at any time when the serial.device isn't using
> RAD_BOOGIE creates a window or something...  (20000 almost always causes
> a crash.  1200->2400 does so every once in a while)
>

You do not mention if you have oustanding I/O requests when you do the
SETPARMS (to change the baud rate).  RKM mentions that " a parameter
change cannot be performed while actually processing and I/O request ....
therefore you must use SDCMD_SETPARAMES only when you have no serial I/O
requests pending".  This means executing an AbortIO(readrequest) before
resetting the baudrate (or any other comm parameter) if, as usually done
by comm programs, one has started an input request.  I do not have your
code handy, so this might not apply if you do indeed use AbortIO.

-- Marco
 
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