06-16-2011
Quote:
Originally Posted by
rama krishna
SO Perderabo can I Infer this from your above statement. Firmware upgrade means upgrading the Open Boot Program .I mean the little piece of software in eeprom. And any changes I am making at ok> I am making them in Open boot program stored in the EEPROM.
No, ksh is software, but a softare update may not update ksh. As fpmurphy mentions there may be more than one firmware program. The V240 server on my desk right now has OBP and ALOM which are both firmware. This is why we should speak of an uptime to OBP or an update to ALOM. Terms like "software update" or "firmware update" don't really convey much information.
And OBP does not store stuff in EEPROM. When you make a change at the ok prompt you are actually changing the NVRAM. The nvram is a chip with a little battery built into the chip. When the battery dies, so does the data in the chip. OBP continues to live in EEPROM and with a lot of effort you can boot a box in this condition. To confuse the issue, Sun has a program which can be run as root called eeprom. eeprom displays the stuff in nvram. I would love to know why they called it "eeprom".
It's been a while since I updated OBP, but I remember that I have to pop the cover off and flip a switch to make EEPRPOM updatable. Then after the update I flipped it back. (Or maybe it was a jumper?) Anyway EEPROM is usually fixed in value.
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LEARN ABOUT OPENDARWIN
nvram
nvram(8) System Manager's Manual nvram(8)
NAME
nvram - manipulate Open Firmware NVRAM variables
SYNOPSIS
nvram [ -p ] [ -f filename ] [ name ] [= value ] ...
DESCRIPTION
The nvram command allows manipulation of Open Firmware NVRAM variables. It can be used to get or set a variable. It can also be used to
print all of the variables or set a list of variables from a file. Changes to NVRAM variables are only saved by clean restart or shutdown.
In principle, name can be any string. In practice, not all strings will be accepted. New World machines can create new variables as
desired. Some variables require administrator privilege to get or set.
The given value must match the data type required for name. Binary data can be set using the %xx notation, where xx is the hex value of
the byte. The type for new variables is always binary data.
OPTIONS
-p Print all of the Open Firmware variables.
-f filename
Set Open Firmware variables from a text file. The file must be a list name=value statements. If the last character of a line is ,
the value will be continued to the next line.
EXAMPLES
example% nvram boot-args="-s rd=*hd:10"
Set the boot-args variable to "-s rd=*hd:10". This would specify single user mode with the root device in hard drive partition 10.
example% nvram my-variable="String One%00String Two%00%00"
Create a new variable, my-variable, containing a list of two C-strings that is terminated by a NUL.
December 12, 2000 nvram(8)