161Chapter G - Using SCO UNIX V/386used as a boot drive when it is the GDT controller to make the boot drive available. As analternative for the following "new" mapping method of SCO UNIX V/386 3.2v5.x, you mayalso use the mapping as described in section G.5 (for 3.2v2.0 & 3.2v4.x). To enable this("old") mapping, change in the/etc/conf/pack.d/gdth/space.cgdth_mapping=1 intogdth_mapping=0Host adapter Number (HA)The host adapter number assigned to the GDT controller is derived from the DPMEMstarting address of the GDT controller. Therefore, if there is only one GDT controller i n-stalled in the PCI computer system, the host adapter number is = 0. If there are two GDTcontrollers installed, the GDT controller with the lower DPMEM address is assigned hostadapter number 0 and the GDT controller with the higher DPMEM address is assigned hostadapter number 1. (Note: After a cold boot the GDT BIOS displays a couple of messages,each beginning with the controller's PCI slot number. This boot message includes theDPMEM address of the GDT controller, too. This helps you determine the host adapternumber of the GDT controller. Also see chapter B, Hardware Installation).UNIX Target-ID and LUNTarget-IDs and LUNs for "Direct Access Devices" (devices behaving like a hard disk or aremovable hard and therefore configurable with GDTSETUP), are directly assigned to theSCSI-ID and the channel of the GDT controller.Host drives are assigned in increasing orderto the free coordinates (bus number and traget ID; LUN is always 0).Configuration Example:In the PCI computer there are two GDT controllers (HA 0 = 1st GDT, HA 1 = 2nd GDT), eachwith two SCSI channels.1 hard disk as host drive no. 0 on HA01 hard disk as host drive no. 0 on HA11 hard disk as host drive no. 1 on HA11 Streamer SCSI-ID 2, LUN 0 on SCSI channel A of HA01 CD-ROM SCSI-ID 3, LUN 0 on SCSI channel B of HA01 DAT SCSI-ID 2, LUN 0 on SCSI channel A of HA1Result:HA Bus Target-ID LUN Device0 0 0 0 1st hard disk, host drive no. 0(boot drive)0 0 2 0 Streamer0 1 3 0 CD-RM1 0 0 0 hard disk, host drive no. 01 0 1 0 hard disk, host drive no. 11 0 2 0 DAT1 0 3 0 hard disk, host drive no.2
