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path_to_inst(5)

path_to_inst(5)                  File Formats                  path_to_inst(5)



NAME
       path_to_inst - device instance number file

SYNOPSIS
       /etc/devices/path_to_inst

DESCRIPTION
       /etc/devices/path_to_inst  records mappings of physical device names to
       instance numbers.


       The instance number of a device is encoded in its minor number, and  is
       the  way  that a device driver determines which of the possible devices
       that it may drive is referred to by a given special file.


       In order to keep instance numbers persistent across reboots, the system
       records them in /etc/devices/path_to_inst.


       This  file  is read only at boot time, and is updated by add_drv(8) and
       devfsadm(8).


       Note that it is generally not necessary for the system administrator to
       change this file, as the system will maintain it.


       The  system administrator can change the assignment of instance numbers
       by editing this file and doing a reconfiguration reboot.  However,  any
       changes  made in this file will be lost if add_drv(8) or devfsadm(8) is
       run before the system is rebooted.


       Each instance entry is a single line of the form:

         "physical name" instance number "driver binding name"



       where

       physical name          is the absolute physical pathname of  a  device.
                              This pathname must be enclosed in double quotes.


       instance number        is a decimal or hexadecimal number.


       driver binding name    is the name used to determine the driver for the
                              device. This name may be a  driver  alias  or  a
                              driver  name.  The  driver  binding name must be
                              enclosed in double quotes.


EXAMPLES
       Example 1 Sample path_to_inst Entries




       Here are some sample path_to_inst entries:


         "/iommu@f,e0000000" 0 "iommu"
         "/iommu@f,e0000000/sbus@f,e0001000" 0 "sbus"
         "/iommu@f,e0000000/sbus@f,e0001000/sbusmem@e,0" 14 "sbusmem"
         "/iommu@f,e0000000/sbus@f,e0001000/sbusmem@f,0" 15 "sbusmem"
         "/iommu@f,e0000000/sbus@f,e0001000/ledma@f,400010" 0 "ledma"
         "/obio/serial@0,100000" 0 "zs"
         "/SUNW,sx@f,80000000" 0 "SUNW,sx"



FILES
       /etc/devices/path_to_inst     Mapping  of  physical  device  names   to
                                    instance numbers.


SEE ALSO
       boot(8), devfsadm(8), mknod(8), add_drv(8)

WARNINGS
       If  the  file is removed the system may not be bootable (as it may rely
       on information found in this  file  to  find  the  root,  usr  or  swap
       device). If it does successfully boot, it will regenerate the file, but
       after rebooting devices may end up having different minor numbers  than
       they  did  before,  and special files created via mknod(8) may refer to
       different devices than expected.


       For the same reasons, changes should not be made to this  file  without
       careful consideration.

NOTES
       This document does not constitute an API. path_to_inst may not exist or
       may have a different content or interpretation in a future release. The
       existence  of  this  notice does not imply that any other documentation
       that lacks this notice constitutes an API.


       The path  to  this  file  is  now  changed  from  /etc/path_to_inst  to
       /etc/devices/path_to_inst.  If  it  is  removed,  it can be restored by
       using pkg fix command.



Oracle Solaris 11.4               25 Nov 2016                  path_to_inst(5)
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