EEPROM(8)

NAME
eeprom - display or modify contents of the EEPROM or openprom

SUN 3 SYNOPSIS
eeprom [-] [-c] [-f device] [-i] [ field[ =value] ...]

SPARC, SPARC64, MACPPC and PREP SYNOPSIS
eeprom [-] [-c] [-f device] [-i] [-v] [ field[ =value] ...]

DESCRIPTION
eeprom provides an interface for displaying and changing the contents of the EEPROM or openprom. The eeprom tool is only installed on supported platforms.

Without any arguments, eeprom will list all of the known fields and their corresponding values. When given the name of a specific field, eeprom will display that value or set it if the field name is followed by ‘=’ and a value. Only the super-user may modify the contents of the EEPROM or openprom.

The options are as follows:

-   Commands are taken from stdin and displayed on stdout.

-c  eeprom will fix incorrect checksum values and exit. This flag is quietly ignored on systems with an openprom.

-f device
    On systems with an EEPROM, use device instead of the default /dev/eeprom. On systems with an openprom, use device instead of the default /dev/openprom.

-i  If checksum values are incorrect, eeprom will ignore them and continue after displaying a warning. This flag is quietly ignored on systems with an openprom.

The following options are valid only on the SPARC and will produce an error when used on a Sun 3:

-v  On systems with an openprom, be verbose when setting a value. Systems with an EEPROM are always verbose.

The -v option is also present on sparc64, macppc, and prep systems.

FIELDS AND VALUES
The following fields and values are for systems with an EEPROM:

hwupdate
    A valid date, such as “7/12/95”. The strings “today” and “now” are also acceptable.

memsize
    How much memory, in megabytes, is installed in the system.

memtest
    How much memory, in megabytes, is to be tested upon power-up.

scrsize
    The size of the screen. Acceptable values are “1024x1024”, “1152x900”, “1600x1280”, and “1440x1440”.

watchdog_reboot
    If true, the system will reboot upon reset. Otherwise, the system will fall into the monitor.

default_boot
    If true, the system will use the boot device stored in bootdev.

bootdev
    Specifies the default boot device in the form cc(x,x,x), where ‘cc’ is a combination of two letters such as ‘sd’ or ‘le’ and each ‘x’ is a hexadecimal number between 0 and ff, less the prepending ‘0x’.

kbdtype
    This value is “0” for all Sun keyboards.

console
    Specifies the console type. Valid values are “b&w”, “ttya”, “ttyb”, “color”, and “p4opt”.

keyclick
    If true, the keys click annoyingly.

diagdev
    This is a string very similar to that used by bootdev. It specifies the default boot device when the diagnostic switch is turned on.

diagpath
    A 40-character, NULL-terminated string specifying the kernel or standalone program to load when the diagnostic switch is turned on.

columns
    An 8-bit integer specifying the number of columns on the console.

rows
    An 8-bit integer specifying the number of rows on the console.

ttya_use_baud
    Use the baud rate stored in ttya_baud instead of the default 9600.

ttya_baud
    A 16-bit integer specifying the baud rate to use on ttya.

ttya_no_rtsdtr
    If true, disables RTS/DTR.

ttyb_use_baud
    Similar to ttya_use_baud, but for ttyb.

ttyb_baud
    Similar to ttya_baud, but for ttyb.

ttyb_no_rtsdtr
    Similar to ttya_no_rtsdtr, but for ttyb.

banner
    An 80-character, NULL-terminated string to use at power-up instead of the default Sun banner.

Note that the secure, bad_login, and password fields are not currently supported.

Since the openprom is designed such that the field names are arbitrary, explaining them here is dubious. Below are field names and values that one is likely to see on a system with an openprom. NOTE: this list may be incomplete or incorrect due to differences between revisions of the openprom.

sunmon-compat?
    If true, the old EEPROM-style interface will be used while in the monitor, rather than the openprom-style interface.

selftest-#megs
    A 32-bit integer specifying the number of megabytes of memory to test upon power-up.

oem-logo
    A 64bitx64bit bitmap in Sun Iconedit format. To set the bitmap, give the pathname of the file containing the image. NOTE: this property is not yet supported.

oem-logo?
    If true, enables the use of the bitmap stored in oem-logo rather than the default Sun logo.

oem-banner
    A string to use at power up, rather than the default Sun banner.

oem-banner?
    If true, enables the use of the banner stored in oem-banner rather than the default Sun banner.

ttya-mode
    A string of five comma separated fields in the format “9600,8,n,1,-”. The first field is the baud rate. The second field is the number of data bits. The third field is the parity; acceptable values for parity are ‘n’ (none), ‘e’ (even), ‘o’ (odd), ‘m’ (mark), and ‘s’ (space). The fourth field is the number of stop bits. The fifth field is the ‘handshake’ field; acceptable values are ‘-’ (none), ‘h’ (RTS/CTS), and ‘s’ (Xon/Xoff).

ttya-rts-dtr-off
    If true, the system will ignore RTS/DTR.

ttya-ignore-cd
    If true, the system will ignore carrier detect.

ttyb-mode
    Similar to ttya-mode, but for ttyb.

ttyb-rts-dtr-off
    Similar to ttya-rts-dtr-off, but for ttyb.

ttyb-ignore-cd
    Similar to ttya-ignore-cd, but for ttyb.

sbus-probe-list
    Four digits in the format “0123” specifying which order to probe the sbus at power-up. It is unlikely that this value should ever be changed.

screen-#columns
    An 8-bit integer specifying the number of columns on the console.

screen-#rows
    An 8-bit integer specifying the number of rows on the console.

auto-boot?
    If true, the system will boot automatically at power-up.

watchdog-reboot?
    If true, the system will reboot upon reset. Otherwise, system will fall into the monitor.

input-device
    One of the strings “keyboard”, “ttya”, or “ttyb” specifying the default console input device.

output-device
    One of the strings “screen”, “ttya”, or “ttyb” specifying the default console output device.

keyboard-click?
    If true, the keys click annoyingly.

sd-targets
    A string in the format “31204567” describing the translation of physical to logical target.

st-targets
    Similar to sd-targets, but for tapes. The default translation is “45670123”.

scsi-initiator-id
    The SCSI ID of the on-board SCSI controller.

hardware-revision
    A 7-character string describing a date, such as “25May95”.

last-hardware-update
    Similar to hardware-revision, describing when the CPU was last updated.

diag-switch?
    If true, the system will boot and run in diagnostic mode.

FILES

/dev/eeprom
    The EEPROM device on systems with an EEPROM.

/dev/openprom
    The openprom device on systems with an openprom.

/dev/nvram
    The nvram device on PReP systems.

SEE ALSO
ofctl(8)

BUGS
The fields and their values are not necessarily well defined on systems with an openprom. Your mileage may vary.

There are a few fields known to exist in some revisions of the EEPROM and/or openprom that are not yet supported. Most notable are those relating to password protection of the EEPROM or openprom.

Avoid gratuitously changing the contents of the EEPROM. It has a limited number of write cycles.

The date parser isn't very intelligent.