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NVSETENV(8)							   NVSETENV(8)

NAME
       nvsetenv - change/view OF's environment boot-variables

SYNOPSIS
       nvsetenv [variable [value]]

DESCRIPTION
       nvsetenv	 is  a	program	 to adjust or view the Open Firmware (OF) boot
       parameters stored in non-volatile (battery-powered) RAM on your	Macin‐
       tosh computer.  nvsetenv will show the current values of all OF's envi‐
       ronment variables when no parameters are given.

OPTIONS
       variable
	      nvsetenv will show current value of  an  OF's  variable,	if  no
	      value is given

       variable value
	      nvsetenv will set variable to value

EXAMPLES
       This  example  will  set	 the boot device to the first SCSI disk on the
       internal SCSI bus, using /vmlinux as boot  image,  trying  to  use  the
       third partition as root partition.

	       > nvsetenv boot-device  "scsi-int/sd@0:0"
	       > nvsetenv boot-file    " /vmlinux root=/dev/sda3"

       Alternatives boot devices are:

	       scsi/sd@1:0	       SCSI disk at ID 1
	       ata/ata-disk@0:0	       Internal IDE disk

       You  can	 also boot from a floppy, you need a XCOFF-format kernel image
       (in this example: vmlinux.coff), copied to a  HFS  format  high-density
       (1.44Mb) floppy.

	       > nvsetenv boot-device  "fd:vmlinux.coff"
	       > nvsetenv boot-file    " root=/dev/sda3"

       To return to MacOS, do:

	       > nvsetenv boot-device  "/AAPL,ROM"

       Valid values for "input-devices" are:

	       ttya		       Modem serial port
	       ttyb		       Printer serial port
	       kbd		       Keyboard
	       enet		       Ethernet interface

       Valid values for "output-devices" are (machine and/or OF dependent):

	       screen		       Screen display (newer machines)
	       /chaos/control	       Screen display (7500, 7600 and 8500)
	       /bandit/ATY,264GT-B     Screen display (6500)

       OF is not designed to wait for your hard disk to spin up (remember Mac‐
       OS boots from ROM).  Use the following setting to have OF retry to boot
       from your disk until is has spun up:

	       > nvsetenv boot-command "begin ['] boot catch 1000 ms cr again"

       You  only  have	to  append  an "S" to the "boot-file" variable to boot
       Linux in single user mode.

FILES
       nvsetenv needs the following device:

       /dev/nvram
	      character device with major number 1yy and minor number 10

       /proc/cpuinfo
	      to identify New/Old-World machines

BUGS
       On NewWorld machines setting an undefined variable is not implemented.

       NewWorld	 machines  contain  binary  values  those  are	not  specially
       treated.

       Also  it	 is  not  a bug take care when setting special characters (\\)
       with a shell.

FILES
       macos(8)

AUTHORS
       Paul Mackerras <paulus@cs.anu.edu.au> (program)

       Richard van Hees <R.M.vanHees@fys.ruu.nl> (documentation)

       Klaus Halfmann  <halfmann@libra.de> (NewWorld code, additional documen‐
       tation)

								   NVSETENV(8)

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