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Annotation of coherent/a/usr/man/COHERENT/at, revision 1.1

1.1     ! root        1: 
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        !             3: at                        Device Driver                        at
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        !             8: Drivers for hard-disk partitions
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        !            11: /dev/at* are the COHERENT system's AT devices for the hard-disk's
        !            12: partitions.  Each device  is assigned major-device number 11, and
        !            13: may be accessed as a block- or character-special device.
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        !            15: The at  hard-disk driver handles two drives with  up to four par-
        !            16: titions each.  Minor  devices 0 through 3 identify the partitions
        !            17: on drive 0.  Minor devices 4 through 7 identify the partitions on
        !            18: drive  1.  Minor  device 128  allows  access to  all of  drive 0.
        !            19: Minor device 129 allows access to  all of drive 1.  To modify the
        !            20: offsets and sizes of the partitions, use the command fdisk on the
        !            21: special device for each drive (minor devices 128 and 129).
        !            22: 
        !            23: To access a  disk partition through COHERENT, directory /dev must
        !            24: contain a  device file that  has the appropriate  type, major and
        !            25: minor device numbers,  and permissions.  To create a special file
        !            26: for this device, invoke the command mknod as follows:
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        !            29: /etc/mknod /dev/at0a b 11   0 ; : drive 0, partition 0
        !            30: /etc/mknod /dev/at0b b 11   1 ; : drive 0, partition 1
        !            31: /etc/mknod /dev/at0c b 11   2 ; : drive 0, partition 2
        !            32: /etc/mknod /dev/at0d b 11   3 ; : drive 0, partition 3
        !            33: /etc/mknod /dev/at0x b 11 128 ; : drive 0, partition table
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        !            36: ***** Drive Characteristics *****
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        !            38: To read the characteristics of a hard disk, use the call to ioctl
        !            39: of the following form:
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        !            42:         #include <sys/hdioctl.h>
        !            43:         hdparm_t hdparms;
        !            44:                 . . .
        !            45:         ioctl(fd, HDGETA, (char *)&hdparms);
        !            46: 
        !            47: 
        !            48: where  fd is  a  file descriptor  for  the hard  disk device  and
        !            49: hdparms receives the disk characteristics.
        !            50: 
        !            51: ***** Non-Standard and Unsupported Types of Drives *****
        !            52: 
        !            53: Prior releases of the  the COHERENT at hard-disk driver would not
        !            54: support disk drives whose  geometry was not supported by the BIOS
        !            55: disk  parameter tables.   COHERENT release  3.1 adds  support for
        !            56: these  drives  during   installation  by  ``patching''  the  disk
        !            57: parameters into the bootstrap and the /coherent image on the hard
        !            58: disk.  Please note that if  you intend to move your COHERENT root
        !            59: file system from an  unsupported drive to another disk drive, you
        !            60: will need  to patch these parameters to  match the drive geometry
        !            61: of the new disk drive.
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        !            63: 
        !            64: COHERENT Lexicon                                           Page 1
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        !            69: at                        Device Driver                        at
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        !            73: 
        !            74: ***** Files *****
        !            75: 
        !            76: /ddeevv/aatt* -- Block-special files
        !            77: /ddeevv/rraatt* -- Character-special files
        !            78: 
        !            79: ***** See Also *****
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        !            81: device drivers, fdisk
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        !           130: COHERENT Lexicon                                           Page 2
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