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From: awb@aipna.ed.ac.uk (Alan W Black)
Newsgroups: comp.os.minix
Subject: ST1.5.10 patch2 scrolling problem
Message-ID: <2965@aipna.ed.ac.uk>
Date: 3 Sep 90 20:53:18 GMT
Sender: news@aipna.ed.ac.uk
Reply-To: awb@aipna.ed.ac.uk (Alan W Black)
Organization: Dept of AI, Edinburgh, UK
Lines: 58


[ I've just noticed our machine lost news yesterday so maybe this is
  already noted -- awb ]

I have a 4Meg STe with one floppy disk drive (I've ordered the hard
disk -- but its not here yet, and it probably wont work anyway).

However, I have upgraded my version of 1.5.10 with the two patches Frans sent
out recently -- all crcs are as per the postings (except tos.c but
that isn't relevant).

When I boot the 1.5.10.2 it comes up ok but when it tries to scroll
the screen it goes into an infinite loop duplicating the last line of
the screen -- rebooting is the only way out.  I have left the NR_CONS
variable as defined in the distribution (I originally tried it with 4
and had the same problem).  When set to 2, I do get two virtual
consoles and can switch between them.  As long as I don't fill the 
screen the system runs.

I have /etc/ttys to be

    100
    101

Though I am not sure of the syntax of this file -- I deleted the 0f1 line
assuming it to be something to do with the rs232 line (which still works
on tty2).

I had a look at the code (kernel/stvdu.c) and wonder if its something
to do with the virtual console structure not being initialised  properly,
though such things will be difficult to debug when you can't print to the 
screen at the time the problem happens.

I also wondered about HARD_SCROLL perhaps there is something different in 
STe rather than the ST and although Frans said he has removed that 
stuff maybe there's a bit left over, I looked (though not very hard)
for anything like that.

The only thing I can think of is that I recompiled the library forgetting
to upgrade lib/minix/config.h and lib/sys/wait.h which have changed
I did have the new ones when I recompiled the kernel (fs and mm).  I
looked to see if anything might be relevant,  wait.h shouldn't,  but this
does mean I compiled the library with C_RS232_INT_HANDLERS set to 0 
but it doesn't seem to be referenced in the library. (Also I see 
NR_DRIVES is set to 3, I assume this is because Frans has 3 drives, unlike
the rest of us :-)

So, does anybody else have this problem, virtual consoles would
be good so I don't want to miss out.  Anybody guess what I am 
doing wrong ?

thanks

Alan

Alan W Black                          80 South Bridge, Edinburgh, UK
Dept of Artificial Intelligence       tel: (+44) -31 225 7774 x228 or x223
University of Edinburgh               email: awb@ed.ac.uk