Patch-ID# 102435-01
Keywords: floppy overrun underrun ss10  
Synopsis: SunOS 4.1.3_U1: POINT PATCH fd0:overrun/underrun errors with heavy load
Date: Jul/31/95

Solaris Release: 1.1.1A

SunOS Release:  4.1.3_U1A
 
Unbundled Product: 

Unbundled Release: 
 
Topic:  POINT PATCH for Floppy errors

  NOTE: As a point patch, this fix is not currently scheduled nor will
        necessarily be approved for integration in a future SunOS release.
 
BugId's fixed with this patch: 1107238 

Changes incorporated in this version: 

Relevant Architecture: sparc
    NOTE: sun4m

Patches which may conflict with this patch: 

Obsoleted by: 

Files included with this patch:  fd_asm.o , fd.o

Problem Description: 

fd0:overrun/underrun errors while running format/tar on floppy  when machine 
is heavily loaded  in following configuration :

SS10/OS 4.1.3_U1 32 MB (memory) , SPC with terminal connected at 38.4KB 
and running the /usr/games/rain program.

INSTALL: 
     	mv /sys/sun4m/OBJ/fd.o  /sys/sun4m/OBJ/fd.o.FCS
 	mv /sys/sun4m/OBJ/fd_asm.o  /sys/sun4m/OBJ/fd_asm.o.FCS

	cp sun4m/fd.o /sys/sun4m/OBJ
	cp sun4m/fd_asm.o /sys/sun4m/OBJ	

Please Refer to the System and Networking Administration Manual
section on building and installing a custom kernel.

IMPORTANT NOTE: This may not fix the problem under all possible load conditions
but it is likely to alleviate the problem.