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The Linux kernel configuration item CONFIG_IBMMCA_SCSI_ORDER_STANDARD:

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In the PC-world and in most modern SCSI-BIOS-setups, SCSI-hard disks are assigned to the drive letters, starting with the lowest SCSI-id (physical number -- pun) to be drive C:, as seen from DOS and similar operating systems. When looking into papers describing the ANSI-SCSI-standard, this assignment of drives appears to be wrong. The SCSI-standard follows a hardware-hierarchy which says that id 7 has the highest priority and id 0 the lowest. Therefore, the host adapters are still today everywhere placed as SCSI-id 7 by default. In the SCSI-standard, the drive letters express the priority of the disk. C: should be the hard disk, or a partition on it, with the highest priority. This must therefore be the disk with the highest SCSI-id (e.g. 6) and not the one with the lowest! IBM-BIOS kept the original definition of the SCSI-standard as also industrial- and process-control-machines, like VME-CPUs running under realtime-OSes (e.g. LynxOS, OS9) do.

If you like to run Linux on your MCA-machine with the same assignment of hard disks as seen from e.g. DOS or OS/2 on your machine, which is in addition conformant to the SCSI-standard, you must say Y here. This is also necessary for MCA-Linux users who want to keep downward compatibility to older releases of the IBM-MCA-SCSI-driver (older than driver-release 2.00 and older than June 1997).

If you like to have the lowest SCSI-id assigned as drive C:, as modern SCSI-BIOSes do, which does not conform to the standard, but is widespread and common in the PC-world of today, you must say N here. If unsure, say Y.



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