Patch Name:  PHKL_7824

Patch Description: s700 9.09+ PC floppy data loss fix

Creation Date: 96/06/26

Post Date:  96/07/17

Repost: 96/07/19
        The patch customize script was modified so that the patch
        will not install on HP-UX 9.09.

Hardware Platforms - OS Releases:
        s700: 9.09+

Products: N/A

Filesets:
        KERN-BLD

Automatic Reboot?: Yes

Status: General Release

Critical:
        Yes
        PHKL_7824: CORRUPTION

Path Name:  /hp-ux_patches/s700/9.X/PHKL_7824

Symptoms:
        PHKL_7824:
        floppy drive data loss

        PHKL_6033:
        pc_floppy cannot mediainint 2DD disk on faster 700s

Defect Description:
        PHKL_7824:
        "uname" in a tight loop (or any other access to the PDC)
        while comparing data read and written to the floppy will
        easily reproduce the data loss.  In this case, the data loss
        is caused by overflow of the floppy DMA buffer when
        interrupts are not serviced fast enough.

        PHKL_6033:
        Fixes a bug where low-density floppies could not be
        mediainit'd.

SR:
        5003322180

Patch Files:  
        /etc/conf/libhp-ux.a(pc_fdc.o)
        /etc/conf/libhp-ux.a(pc_floppy.o)

what(1) Output:
        /etc/conf/libhp-ux.a(pc_fdc.o):
                pc_fdc.c $Revision: 1.2.87.4 $ $Date: 96/06/20 16:17
                        :08 $PATCH_9.09(+) (PHKL_7824 for 909+, PHKL
                        _7825 for 909)
        /etc/conf/libhp-ux.a(pc_floppy.o):
                pc_floppy.c $Revision: 1.2.87.3 $ $Date: 96/06/20 16
                        :18:40 $PATCH_9.09(+) (PHKL_7824 for 909+, P
                        HKL_7825 for 909)

sum(1) Output:
        42922 54 /etc/conf/libhp-ux.a(pc_fdc.o)
        64975 44 /etc/conf/libhp-ux.a(pc_floppy.o)

Patch Conflicts: None

Patch Dependencies:  None

Hardware Dependencies:  None

Other Dependencies:  None

Supersedes:  
        PHKL_6033

Equivalent Patches:
        PHKL_7825:
        s700: 9.09

Patch Package Size:  110 Kbytes

Installation Instructions:  
        Please review all instructions and the Hewlett-Packard
        SupportLine User Guide or your Hewlett-Packard support terms
        and conditions for precautions, scope of license,
        restrictions, and, limitation of liability and warranties,
        before installing this patch.
        ------------------------------------------------------------
        1. Back up your system before installing a patch.

        2. Copy the patch to your /tmp directory and unshar it:

                cd /tmp
                cp patch_source/PHKL_7824 .
                sh PHKL_7824

        3. Become root and run update:

                /etc/update [-r [kernel_gen_file]] -s \
                        /tmp/PHKL_7824.updt PHKL_7824

        Update moves the original software to
        /system/PHKL_7824/orig.  Keep this file to recover from any
        potential problems.  You should move the .text file to
        /system/PHKL_7824 for future reference.

        To put this patch on a magnetic tape and update from the
        tape drive, use dd:

                dd if=PHKL_7824.updt of=/dev/rmt/0m bs=2048

Special Installation Instructions:  None