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Top Forums UNIX for Dummies Questions & Answers Setting a boot device alias on Sun hardware Post 19486 by thehoghunter on Thursday 11th of April 2002 05:10:22 PM
Old 04-11-2002
From Sunsolve:

1) Creating a boot alias using nvalias from the OpenBoot PROM command line.

Get the device path for the boot disk:

# ls -la /dev/dsk/cxtxdxsx

Write down the entire (physical) path to be used for the alias.

Shutdown the system to the ok prompt.

Create the alias:

ok nvalias <alias> <device-path>


ok nvalias newdisk /iommu@f,e0000000/sbus@f,e0001000/esp@f,800000/sd@3,0:a

or for PCI based systems:

ok nvalias newdisk /pci@1f,0/pci@1/scsi@3,1/disk@3,0

NOTE: Although format will show the pci device with a "sd" designation, a translation is made as the OBP's device tree is 'disk'. This is the only name that the firmware will understand.

Modify the NVRAM so that it boots from the new alias automatically:

ok setenv boot-device newdisk

ok reset

The above will be valid till you run set-defaults or nvunalias from the ok prompt..

2) Alternate method for creating a boot alias using nvedit.

Use the NVRAM editor to create a script that will create the boot alias at reset:

ok nvedit

0: devalias newdisk /iommu@f,e0000000/sbus@f,e0001000/esp@f,800000/sd@3,0:a

^c (control c)

ok nvstore

ok setenv use-nvramrc? true

ok reset

3) Alternate method for creating a boot alias using existing device aliases provided in the OpenBoot PROM.

Use the devalias command to identify the existing device aliases:

ok devalias

The device alias names are listed on the left side of the output. Any of the device alias names that point to disk drives can be used as boot aliases.

Use one of the device alias names to set a new boot device:

ok setenv boot-device <new device alias name>

Display the new boot device alias:

ok printenv boot-device

Test the new boot alias by resetting the machine;

ok reset

Note: The device path above is an example only; you will not necessarily have the same path.
Note: The "0:" in the nvedit example (method 2) is the line number; do not type it as part of your edit.

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path_to_inst(4) 						   File Formats 						   path_to_inst(4)

path_to_inst - device instance number file SYNOPSIS
/etc/path_to_inst DESCRIPTION
/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: "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/path_to_inst SEE ALSO
add_drv(1M), boot(1M), drvconfig(1M), mknod(1M) 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(1M) 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. SunOS 5.10 2 Nov 1995 path_to_inst(4)

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