OBSOLETE Patch-ID# 100397-02
Keywords: ALM2, serial port, printer hangs, XON, XOFF
Synopsis: OBSOLETED by 100513
Date: 07-Oct-91 
 
SunOS release: 4.1, 4.1.1, 4.1_PSR_A

Topic: change tty_ldterm to fix flow control problem. This patch particularly 
       fixes the hang problem at the END of a print job while 100225 handles
       XON/XOFF problem DURING but before the END of the job.
       
 
BugId's fixed with this patch: 1048128 1069768

Architectures for which this patch is available: Sun4 (4.1_PSR_A & 4.1.1), Sun4c (4.1 & 4.1.1)

Patches which may conflict with this patch: is compatible with 100225

Changes incorporated in this version: added sun4 4.1.1 tty_ldterm.o

Files included with this patch: tty_ldterm.o

Obsoleted by: 100513

Problem Description:

BugID 1048128:
When sending output to printers, terminals, plotters etc. using
the ALM2 or zs serial ports with the xon/xoff flow control, the
output may hang intermittently.

Flow control problems exist in SunOS 4.1, and 4.1.1.  After some
extended period of time, the device would send an xoff, and data
would stop.  When data is to be resumed with an xon from the device,
the xon seems to have been dropped or ignored because data flow did
not continue.

BugID 1069768:
Sun doesn't respond on xoff at the end of a printjob

INSTALL:

As root, install the patches:

Save the previous system files:
mv /sys/`arch -k`/OBJ/tty_ldterm.o /sys/`arch -k`/OBJ/tty_ldterm.o.orig

Install the new files into the system configuration area:
cp `arch -k`/{4.1,4.1_PRS_A,4.1.1}/tty_ldterm.o /sys/`arch -k`/OBJ


Config a new kernel and reboot the machine with this kernel.