Copyright 2019 Peter Tribble.
Copyright 2020 Carlos Neira <cneirabustos@gmail.com>.
Copyright (c) 2004, Sun Microsystems, Inc. All Rights Reserved
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
/usr/sbin/eeprom [-] [-f device] [parameter[=value]]
Only the super-user may alter the EEPROM contents.
eeprom verifies the EEPROM checksums and complains if they are incorrect.
platform-name is the name of the platform implementation and can be found using the -i option of uname(1).
Because x86 based systems typically implement password protection in the system BIOS, there is no support for password protection in the eeprom program. While it is possible to set the security-mode, security-password and security-#badlogins properties on x86 based systems, these properties have no special meaning or behavior on x86 based systems.
Use device as the EEPROM device.
A configuration variable that controls the use of Advanced Configuration and Power Interface (ACPI), a power management specification. The acceptable values for this variable depend on the release of the Solaris operating system you are using. For all releases of Solaris 10 and Solaris 11, a value of of 0x0 means that there will be an attempt to use ACPI if it is available on the system. A value of 0x2 disables the use of ACPI. For the Solaris 10 1/06 release, a value of 0x8 means that there will be an attempt to use ACPI in a mode compatible with previous releases of Solaris 10 if it is available on the system. The default for Solaris 10 1/06 is 0x8. For releases of Solaris 10 after the 1/06 release and for Solaris 11, the default is 0x0. Most users can safely accept the default value, which enables ACPI if available. If issues related to the use of ACPI are suspected on releases of Solaris after Solaris 1/06, it is suggested to first try a value of 0x8 and then, if you do not obtain satisfactory results, 0x02.
Specifies the console device. Possible values are ttya, ttyb, ttyc, ttyd, and text. In text mode, console output goes to the frame buffer and input comes from the keyboard. For SPARC, when this property is not present, the console device falls back to the device specified by input-device and output-device. When neither the console property or the input-device and output-device property pair are present, the console defaults to the frame buffer and keyboard.
While console controls both boot loader and kernel console, setting os_console allows setting console device only for kernel. Values are the same as for console.
The diag-device is currently implemented to support serial port as output for system early boot diagnostic messages and input and output for kmdb debugger. For early boot, all the console messages are mirrored to diag-device, until the console drivers are loaded. After that, only kmdb will continue to use the diag-device.
Specifies the amount in bytes of kernel pageable memory available. Increasing this variable allows either larger stacks for the same number of kernel threads or more kernel threads, by default this value is 0x80000000 (2GiB). If the value specified exceeds the size of physical memory it will be automatically capped to that. Valid Ranges: 0xC800000 - 0x200000000(200MiB - 8GiB)
If true, boots automatically after power-on or reset. Defaults to true.
Configuration variable used to control the behavior of the terminal emulator. The value false makes the terminal emulator stop interpreting ANSI escape sequences; instead, echoes them to the output device. Defaults to true.
Holds a string of arguments that are passed to the boot subsystem. For example, you can use boot-args=' - install dhcp' to request a customer jumpstart installation. See boot(8), kadb(8) and kernel(8).
Command executed if auto-boot? is true. Defaults to boot.
Device from which to boot. boot-device may contain 0 or more device specifiers separated by spaces. Each device specifier may be either a prom device alias or a prom device path. The boot prom will attempt to open each successive device specifier in the list beginning with the first device specifier. The first device specifier that opens successfully will be used as the device to boot from. Defaults to disk net.
File to boot (an empty string lets the secondary booter choose default). Defaults to empty string.
Boot device and file (OpenBoot PROM version 1.x only). Defaults to vmunix.
Diagnostic boot device and file (OpenBoot PROM version 1.x only). Defaults to le(\|)unix.
Configuration variable that controls the number of processors with which the system should boot. By default, the system boots with maximum supported number of processors.
Where X is the number of the serial port, prevents device probe on serial port X.
Diagnostic boot source device. Defaults to net.
File from which to boot in diagnostic mode. Defaults to empty string.
Diagnostics level. Values include off, min, max and menus. There may be additional platform-specific values. When set to off, POST is not called. If POST is called, the value is made available as an argument to, and is interpreted by POST. Defaults to platform-dependent.
If true, run in diagnostic mode. Defaults to false on most desktop systems, true on most servers.
Recover after an error reset trap. Defaults to platform-specific setting. On platforms supporting this variable, it replaces the watchdog-reboot?, watchdog-sync?, redmode-reboot?, redmode-sync?, sir-sync?, and xir-sync? parameters. The options are: none
Print a message describing the reset trap and go to OpenBoot PROM's user interface, aka OK prompt.
Invoke OpenBoot PROM's sync word after the reset trap. Some platforms may treat this as none after an externally initiated reset (XIR) trap.
Reboot after the reset trap. Some platforms may treat this as none after an XIR trap.
If true, include name parameter for plug-in device FCodes. Defaults to false.
System version information.
Input device used at power-on (usually keyboard, ttya, ttyb, ttyc, or ttyd). Defaults to keyboard.
If true, enable keyboard click. Defaults to false.
A string that specifies the layout name for non-self-identifying keyboards (type 7c). Invoke kbd -s to obtain a list of acceptable layout names. See kbd(1).
Keymap for custom keyboard.
System update information.
Default load address for client programs. Default value is 16384.
If true, network drivers use their own MAC address, not the system's. Defaults to false.
Manufacturing mode argument for POST. Possible values include off or chamber. The value is passed as an argument to POST. Defaults to off.
If true, repeat system self-tests until interrupted with STOP-A. Defaults to false.
Contents of NVRAMRC. Defaults to empty.
Arguments to be used by the PROM for network booting. Defaults to an empty string. network-boot-arguments can be used to specify the boot protocol (RARP/DHCP) to be used and a range of system knowledge to be used in the process. The syntax for arguments supported for network booting is:
[protocol,] [key=value,]*All arguments are optional and can appear in any order. Commas are required unless the argument is at the end of the list. If specified, an argument takes precedence over any default values, or, if booting using DHCP, over configuration information provided by a DHCP server for those parameters. protocol, above, specifies the address discovery protocol to be used. Configuration parameters, listed below, are specified as key=value attribute pairs. tftp-server
IP address of the TFTP server
file to download using TFTP or URL for WAN boot
IP address of the client (in dotted-decimal notation)
IP address of the default router (in dotted-decimal notation)
subnet mask (in dotted-decimal notation)
DHCP client identifier
hostname to use in DHCP transactions
HTTP proxy server specification (IPADDR[:PORT])
maximum number of TFTP retries
maximum number of DHCP retries
Custom OEM banner (enabled by setting oem-banner? to true). Defaults to empty string.
If true, use custom OEM banner. Defaults to false.
Byte array custom OEM logo (enabled by setting oem-logo? to true). Displayed in hexadecimal.
If true, use custom OEM logo (else, use Sun logo). Defaults to false.
If true, the OpenBoot PROM allocates 64-bit PCI memory addresses to a PCI device that can support 64-bit addresses. This variable is available on SPARC platforms only and is optional. Some versions of SunOS do not support PCI MEM64 addresses and will fail in unexpected ways if the OpenBoot PROM allocates PCI MEM64 addresses. The default value is system-dependent. If the variable exists, the default value is appropriate to the lowest version of the SunOS that shipped with a specific platform.
Output device used at power-on (usually screen, ttya, ttyb, ttyc, or ttyd). Defaults to screen.
Specifies the root device of the operating system.
Designate which SBus slots are probed and in what order. Defaults to 0123.
Number of on-screen columns (characters/line). Defaults to 80.
Number of on-screen rows (lines). Defaults to 34.
SCSI bus address of host adapter, range 0-7. Defaults to 7.
Map SCSI disk units (OpenBoot PROM version 1.x only). Defaults to 31204567, which means that unit 0 maps to target 3, unit 1 maps to target 1, and so on.
Number of incorrect security password attempts.This property has no special meaning or behavior on x86 based systems.
Firmware security level (options: none, command, or full). If set to command or full, system will prompt for PROM security password. Defaults to none.This property has no special meaning or behavior on x86 based systems.
Firmware security password (never displayed). Can be set only when security-mode is set to command or full.This property has no special meaning or behavior on x86 based systems.
example# eeprom security-password= Changing PROM password: New password: Retype new password:
Megabytes of RAM to test. Ignored if diag-switch? is true. Defaults to 1.
If true, POST does not do VMEbus loopback tests. Defaults to false.
Map SCSI tape units (OpenBoot PROM version 1.x only). Defaults to 45670123, which means that unit 0 maps to target 4, unit 1 maps to target 5, and so on.
If true, display Restricted Monitor prompt (\|>). Defaults to false.
Enable 10baseT link test for built-in twisted pair Ethernet. Defaults to true.
TTYA (baud rate, #bits, parity, #stop, handshake). Defaults to 9600,8,n,1,-. Fields, in left-to-right order, are: Baud rate:
110, 300, 1200, 4800, 9600\|.\|.\|.
5, 6, 7, 8
n(none), e(even), o(odd), m(mark), s(space)
1, 1.5, 2
TTYB, TTYC, or TTYD (baud rate, #bits, parity, #stop, handshake). Defaults to 9600,8,n,1,-. Fields, in left-to-right order, are: Baud rate:
110, 300, 1200, 4800, 9600\|.\|.\|.
5, 6, 7, 8
1, 1.5, 2
n(none), e(even), o(odd), m(mark), s(space)
If true, operating system ignores carrier-detect on TTYA. Defaults to true.
If true, operating system ignores carrier-detect on TTYB, TTYC, or TTYD. Defaults to true.
If true, operating system does not assert DTR and RTS on TTYA. Defaults to false.
If true, operating system does not assert DTR and RTS on TTYB, TTYC, or TTYD. Defaults to false.
If true, execute commands in NVRAMRC during system start-up. Defaults to false.
Controls the level of verbosity of PROM messages. Can be one of debug, max, normal, min, or none. Defaults to normal.
If true, hybrid (1.x/2.x) PROM comes up in version 2.x. Defaults to true.
If true, reboot after watchdog reset. Defaults to false.
The following example demonstrates the method for changing from one to two the number of megabytes of RAM that the system will test.
example# eeprom selftest-#megs selftest-#megs=1 example# eeprom selftest-#megs=2 example# eeprom selftest-#megs selftest-#megs=2
Example 2 Setting the auto-boot? Parameter to true.
The following example demonstrates the method for setting the auto-boot? parameter to true.
example# eeprom auto-boot?=true
When the eeprom command is executed in user mode, the parameters with a trailing question mark (?) need to be enclosed in double quotation marks (" ") to prevent the shell from interpreting the question mark. Preceding the question mark with an escape character (\e) will also prevent the shell from interpreting the question mark.
example% eeprom "auto-boot?"=true
Example 3 Using network-boot-arguments
To use DHCP as the boot protocol and a hostname of abcd.example.com for network booting, set these values in network-boot-arguments as:
example# eeprom network-boot-arguments="dhcp,hostname=abcd.example.com"
...then boot using the command:
ok boot net
Note that network boot arguments specified from the PROM command line cause the contents of network-boot-arguments to be ignored. For example, with network-boot-arguments set as shown above, the boot command:
ok boot net:dhcp
...causes DHCP to be used, but the hostname specified in network-boot-arguments will not be used during network boot.
Example 4 Setting System Console to Auxiliary Device
The command below assigns the device /dev/term/a as the system console device. You would make such an assignment prior to using tip(1) to establish a tip connection to a host.
On a SPARC machine:
# eeprom output-device=/dev/term/a
On an x86 machine:
# eeprom console=ttya
On a SPARC machine, the preceding command would be sufficient for assigning the console to an auxiliary device. For an x86 machine, you might, in addition, need to set the characteristics of the serial line, for which you would have to consult the BIOS documentation for that machine. Also, on some x86 machines, you might use a device other than device a, as shown above. For example, you could set console to ttyb if the second serial port is present. Example 5 Changing segkpsize.
The following example demonstrates the method for changing the number of bytes that will be used for kernel pageable memory. Running the following command will set segkpsize to 3GiB.
# eeprom segkpsize=0xC0000000
File storing eeprom values on x86 machines.
Device file
Platform-specific version of eeprom. Use uname -i to obtain platform-name.
OpenBoot 3.x Command Reference Manual