SCO OpenServer Wd Driver Supplement
and
Wd Boot-Time Loadable Driver

In addition to the new features listed in the README below, the supplement also addresses the following 5.0.6 problem:

Divvy now correctly recommends a valid number of filesystems for disks greater than 14GB.(fz300644)

Overview
What's new in the updated wd driver
Before installing the wd driver
Installing the wd driver
- Using the Wd BTLD
- Using the Wd Driver Supplement
Configuring large IDE hard disks
Removing the Wd Driver Supplement

Overview

This updated version of the wd(HW) driver provides a number of bug fixes for SCO OpenServer Release 5.0.6 and Release 5.0.7 systems. Additionally, for SCO Update customers, it also adds new support for IDE hard disks that are larger than 137GB.

The updated wd driver is supported on the following platforms:

SCO OpenServer Release 5.0.7 plus Maintenance Packs/Update Packs

SCO OpenServer Release 5.0.7

SCO OpenServer Release 5.0.6a

Because of software dependencies, it is important that the updated wd driver be installed using the sequence outlined here. Depending on your situation, you may already have completed some of these steps.

Install the SCO OpenServer operating system using the Wd Boot-Time Loadable Driver (BTLD).
If the operating system is already installed, proceed to Step 2 or 3.
For SCO OpenServer Release 5.0.7 systems:
1. Install Maintenance Pack 1.
2. Optional: Install Update Pack 1 to use IDE hard disks larger than 137GB.
Install the Wd Driver Supplement. This supplement adds the updated wd driver and additional supporting files to the system, and is required even if you used the Wd BTLD to install SCO OpenServer.
Optional: Update Pack 1 customers using hard disks larger than 137GB need to reconfigure the drive to make use of all drive space.

The Wd BTLD, Wd Driver Supplement, and Maintenance Pack 1 and Update Pack 1 for SCO OpenServer Release 5.0.7 are available from the SCO web site or FTP site.

These steps are described in more detail later in this document. You should also read ``Before installing the wd driver'' prior to proceeding.

What's new in the updated wd driver

The updated wd driver provides a number of bug fixes, including:

All compliant PCI IDE controllers now recognized.
UDMA mode 6 (UDMA 133) now supported.
Improved ATAPI device recognition.
ATAPI CD and DVD writer devices now supported.
More readable and useful debug output. To turn on debug output, use the wd.debug=[option] bootstring, where [option] can be any of the following:

i      for IDE controller identification
u     for Ultra DMA configuration
g     for disk geometry calculations
Better disk geometry configuration.
IDE hard disks larger than 137GB now recognized as having 137GB of space. Previously these drives were seen as smaller, possibly as small as 2GB.
When kernel debugger is enabled, driver no longer enters the debugger on certain unusual conditions.
Driver no longer panics when attempting to access a non-existent ATAPI device.

Additionally, for customers with SCO OpenServer Release 5.0.7 Update Pack 1, this updated wd driver also provides:

Support for IDE hard disks that are larger than 137GB.

Before installing the wd driver

Before installing the wd driver:

Back up the data on your SCO OpenServer system and verify the integrity of the backup.
Ensure that you have a current, working emergency boot floppy disk set.
If you want to take advantage of the new support for IDE disks that are larger than 137GB, first read ``Configuring large IDE hard disks''.

WARNING: If you intend to use SCO OpenServer Release 5.0.7 Update Pack 1, it must be installed before the Wd Driver Supplement. Installing in the reverse order may render your system unbootable.

If you install the Wd Driver Supplement and later want to add Update Pack 1, complete all of the the following steps before rebooting the system:

Remove the Wd Driver Supplement.
Install Update Pack 1.
Re-install the Wd Driver Supplement.
It is now safe to reboot the system.

The wd(HW) manual page shipped with SCO OpenServer Release 5.0.7 systems is still current. For SCO OpenServer Release 5.0.6 customers, the updated version of the wd(HW) manual page is provided on the SCO web site or FTP site.

Installing the wd driver

The wd driver is available in two forms:

Wd Boot-Time Loadable Driver (BTLD) For use at boot-time when installing SCO OpenServer.
We recommend that you use the Wd BTLD to install SCO OpenServer on IDE systems. Certain circumstances will require you to use the BTLD, including:

current driver does not recognize system's IDE controller

current driver does not support Ultra DMA on your system

current driver incorrectly determines size of the hard disk during Initial System Load (ISL), which could lead to disk geometry conflicts after the installation is complete. You see the detected disk size during the Hard Disk Setup stage of ISL; the hard disk is not modified until this stage is complete so you can safely exit the installation at this point, if needed. (Note that disks larger than 137GB are limited in size to 137GB until Update Pack 1 is installed -- if you see this, it is not an error.)

See ``Using the Wd BTLD'' for instructions on installing the BTLD during SCO OpenServer installation.

Wd Driver Supplement Contains the updated wd driver, as well as additional supporting files.
This supplement is required on all systems that want to use the updated wd driver, even if the system was installed with the Wd BTLD.
See ``Using the Wd Driver Supplement'' for installation instructions.

Using the Wd BTLD

This section describes how to use the Wd BTLD to perform an SCO OpenServer installation.

NOTE: The Wd BTLD provides a minimum set of wd driver functionality to enable the installation of SCO OpenServer. Once system installation is complete, you must add the Wd Driver Supplement for the wd driver to work correctly. See ``Using the Wd Driver Supplement''.

To use the Wd BTLD:

Log in as root.
Download the Wd BTLD image, from either the SCO web site or using FTP, to a temporary directory (such as /tmp/wd_btld.img) on your machine:

NOTE: This BTLD image also provides the Adaptec Ultra320 SCSI HBA driver (ad320).
- to use the SCO web site, go to the SCO Update Service and Supplemental Downloads web page for SCO OpenServer Release 5.0.7:
  
  http://www.sco.com/support/update/download/osr507list.html
- to use FTP, go to the SCO Support Download Area:
  
  ftp://ftp.sco.com/pub/openserver5/drivers/OSR507/btld/wd/
Format a 3.5-inch high density floppy disk using the format(C) command.
Copy the wd_btld.img image to the floppy disk using the dd(C) command:

dd if=/tmp/wd_btld.img of=/dev/fd0 bs=18k
Verify that the image was both downloaded and written to the floppy disk correctly using the sum(C) command:

sum -r /tmp/wd_btld.img
This should return:

16951 2880 /tmp/wd_btld.img
If the checksums are the same, the floppy disk is ready for use.
Insert the SCO OpenServer Primary Boot Disk (either CD-ROM or floppy disk) into the drive on the system that you want to install and turn on the computer. (This step assumes that the IDE controller is already installed in the computer.)
At the boot prompt, enter link.
When prompted for the packages that you want linked in to the system, enter the driver name that is appropriate for the release of SCO OpenServer that you are installing:
- wd (for Release 5.0.7 systems)
- wd506 (for Release 5.0.6a systems)
When prompted for the driver volume, insert the Wd BTLD floppy disk and press <Return>.
The link(HW) command prompts you to replace the current driver with the new wd driver. Type r at the prompt and press <Return>.
After the wd driver is successfully installed, you are prompted to re-insert your boot disk. You can now continue with the SCO OpenServer installation.
After SCO OpenServer is installed, complete the wd driver installation by adding the Wd Driver Supplement. See ``Using the Wd Driver Supplement'' for instructions.

Using the Wd Driver Supplement

The Wd Driver Supplement installs the updated wd driver, as well as a number of supporting files that are required for the driver to work correctly. You must install this supplement to use the updated wd driver, even if you used the Wd BTLD to install the system.

WARNING: If you want to use SCO OpenServer Release 5.0.7 Update Pack 1, install it before the Wd Driver Supplement. Update Pack 1 contains earlier versions of some of the Wd Driver Supplement files. If Update Pack 1 is installed after the supplement, your system could become unbootable.

To install the Wd Driver Supplement:

Log in as root.

NOTE: Because you will need to reboot the system after this product is installed, we recommend that you perform these steps in single-user mode.
Download the Wd Driver Supplement from either the SCO web site or using FTP:
- to use the SCO web site, go to the SCO Update Service and Supplemental Downloads web page for SCO OpenServer Release 5.0.7:
  
  http://www.sco.com/support/update/download/osr507list.html
- to use FTP, go to the SCO Support Download Area:
  
  ftp://ftp.sco.com/pub/openserver5/drivers/OSR507/btld/wdsupp
Start the Software Manager by double-clicking on its icon on the desktop, or by entering the following at the command-line prompt:

scoadmin software
From the Software menu, select Install New.
When prompted for the host (machine), select the current host and then click on Continue.
Select Media Images as the Media Device, then click on Continue. (You may need to scroll down before you see the Media Images option.)
Enter the absolute pathname for the directory that contains the Wd Driver Supplement media image. For example:

/tmp/wdsupp
Click on OK.
In the Install Selection window, make sure that the Wd Driver Supplement is highlighted then click on Install.
When the installation is complete, click on OK. The Software Manager lists the supplement among the installed software.
Exit the Software Manager by selecting the Host menu, then Exit.
Reboot the machine when prompted. Because the Software Manager relinks the kernel during the installation, you must reboot before the new kernel takes effect.
If SCO OpenServer Release 5.0.7 Update Pack 1 is installed and you are using an IDE hard disk that is larger than 137GB, you now need to reconfigure the drive to use all of the drive's space. See ``Configuring large IDE hard disks'' for more information.
If you are using SCO OpenServer Release 5.0.7, we recommend that you install the SCO OpenServer Large Filesystem Performance Supplement. See the SCO OpenServer Large Filesystem Performance Supplement Readme for more information.

Configuring large IDE hard disks

IDE hard disks that are larger than 137GB are supported on SCO OpenServer Release 5.0.7 systems that include Update Pack 1 and the updated wd driver.

Once all of the required software is installed, you will need to reconfigure the hard disk so that all of the drive's space is available.

When using the updated wd driver to install SCO OpenServer on an IDE hard disk that is larger than 137GB, the partition is initially limited to 137GB. Once SCO OpenServer Release 5.0.7 Update Pack 1 is installed, the drive areas above 137GB become available. At this point, you need to add additional partitions or expand existing partitions to make use of the entire hard disk.
Similarly, if SCO OpenServer is already installed on an IDE hard disk that is larger than 137GB, adding SCO OpenServer Release 5.0.7 Update Pack 1 and the updated wd driver enables the system to recognize the full capacity of the drive but the hard disk must be reconfigured to make use of the newly available space.

NOTE: To add a new larger-than-137GB IDE hard disk to an existing SCO OpenServer system, install SCO OpenServer Release 5.0.7 Update Pack 1 and the updated wd driver before adding the new disk. This will ensure that you can access the entirety of the hard disk immediately without additional intervention.

There are a few options for reconfiguring your hard disk to make use of the drive space above 137GB.

NOTE: All of these options involve the use of fdisk(ADM) and divvy(ADM). These are powerful tools that should be used with caution to ensure that you do not accidentally lose data.

Run fdisk(ADM). The utility reports a larger number of tracks than before, some of which are unallocated.

NOTE: When performing any of the steps described below, fdisk may warn that your new UNIX partition is not on a cylinder boundary. You can safely ignore this message.
- If your disk contains only one partition, which is of the type UNIX and starts on track 1, select fdisk option 2. Use Entire Disk for UNIX. The partition is expanded to the end of the disk; the contents of the partition are preserved.
- If your disk contains a single UNIX partition that starts on a track other than 1, or contains multiple partitions where the last entry in the partition table is a UNIX partition, you can delete that partition (select option 6. Delete Partition) and then recreate it (select option 4. Create UNIX Partition), making it larger. You will not lose any data provided the new partition starts on the same track number as the deleted partition.
  
  WARNING: Before attempting this, write down the starting track number of the partition you will delete. This number is extremely important and the fdisk utility will scroll this information off the screen before you need it again.
  Once you delete the partition, do not exit fdisk until you have recreated the replacement partition, or you will lose all data that existed in the deleted partition.
- If the last disk partition is any type other than UNIX, you must add a new UNIX partition to allocate the unused tracks on the disk. Select fdisk option 3. Use Rest of Disk for UNIX. This option preserves all existing partitions.
Once you have expanded existing partitions and/or added additional partitions, run divvy(ADM) to create new divisions and filesystems.

See the ``Adding hard disks'' chapter in the SCO OpenServer Handbook and the fdisk(ADM) and divvy(ADM) manual pages for more information on performing any of these steps.

Removing the Wd Driver Supplement

To remove the Wd Driver Supplement:

Log in as root.

NOTE: Because you will need to reboot the system after this product is removed, we recommend that you perform these steps in single-user mode.
Start the Software Manager by double-clicking on its icon on the desktop, or by entering the following at the command-line prompt:

scoadmin software
Select the Wd Driver Supplement in the list of installed software.
From the Software menu, select Remove Software.
When the removal is complete, exit the Software Manager by selecting the Host menu, then Exit.
Reboot the machine when prompted. Because the Software Manager relinks the kernel during the removal, you must reboot before the new kernel takes effect.

SCO OpenServer Release 5.0.7 plus Maintenance Packs/Update Packs
SCO OpenServer Release 5.0.7
SCO OpenServer Release 5.0.6a

SCO OpenServer Wd Driver SupplementandWd Boot-Time Loadable Driver

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