ATAPI (EIDE CD-ROM) limitations

• If your CD-ROM drive does not read, it might be because the device does not support 6-byte SCSI read commands. In this case, add Srom.ten to your bootstring(HW). At the boot prompt, enter:
  
  defbootstr Srom.ten

  To make this change permanent, you can add the product identification string to a table in the Srom driver's space.c file. To do so:

  1. Determine your device's product identification string using one of these methods:

     • Enter Srom.display or defbootstr Srom.display at the boot prompt. The Srom driver will display the vendor identification string, the product identification string, and the product revision level for the device. Pointers in the display indicate that device is open; blank spaces are significant.
       

     • Edit /etc/conf/pack.d/Srom/space.c, setting each of the following variables to 1:
       
       Srom_Inq_VID  vendor identification string
       Srom_Inq_PID  product identification string
       Srom_Inq_PRL  product revision level

       When the device is opened, the strings are displayed. You must relink and reboot your system after editing this file.

  2. Edit the /etc/conf/pack.d/Srom/space.c file, adding the product identification string to the Srom_TenByte[] array.

  3. Relink and reboot your system.

  The system will now automatically recognize your CD-ROM as a device requiring ten-byte SCSI read commands.

  Contact your hardware vendor about your device's read command requirements; see also the Srom(HW) manual page.

• Internal IDE CD-ROM drives might not be recognized if the initial configuration was set incorrectly, for example:

     Identifying the installation media device
     Media device to be used:  IDE CD ROM
     
  
  
     IDE Controller:    primary
     Master or Slave:   slave
  

  If you have this problem, the boot hardware information display will be similar to:

     %adapter  0x0170-0x0177 15    -  type=IDE ctlr=primary dvr=wd
     %tape     -        -    -  type=IDE ctlr=pri cfg=slv dvr=Stp->wd
     %cd-rom   -        -    -  type=IDE ctlr=pri cfg=slv dvr=Srom->wd
  

  This problem has been encountered in some Toshiba notebooks. To correct it, rerun the initial configuration routine and set the controller values to:

     IDE Controller:    secondary
     Master or Slave:   master
  

• ATAPI CD-ROM drives might hang during installation if you also have SCSI devices configured on your system. The installation process attempts to scan for additional hard drives to allow them to be configured during installation rather than after the installation is complete. However, this scan might cause some ATAPI CD-ROM drives to hang on systems that have both SCSI and ATAPI hardware enabled.

  If you encounter problems, add wd.noscan to your bootstring to prevent scanning during installation. If you need to configure additional hard drives, do so after installation is complete. This bootstring is not required after installation. See bootstring(HW) for more information.

  Systems that include single types of mass storage devices (that is, EIDE/ATAPI or SCSI only) do not need this bootstring.