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| File Formats | path_to_inst(4) |
| | path_to_inst - device instance number
file |
SYNOPSIS
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/etc/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/path_to_inst.
This file is read only at boot time, and is updated by add_drv(1M) and drvconfig(1M).
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(1M)
or drvconfig(1M)
is run before the system is rebooted.
Each instance entry is a single line of the form:
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"physical name" instance number "driver binding name"
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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.
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| | Example 1. Sample path_to_inst Entries
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Here are some sample path_to_inst entries:
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"/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"
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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(1M)
may refer to different devices than expected.
For the same reasons, changes should not be made to this file without
careful consideration.
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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.
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