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https://github.com/lm-sensors/lm-sensors
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3a988c72d2
Christian Vogel <chris@hedonism.cx>; combined the Makefile with eepromer. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1360 7894878c-1315-0410-8ee3-d5d059ff63e0
86 lines
3.4 KiB
Plaintext
86 lines
3.4 KiB
Plaintext
You can use this program to read/write to i2c-eeproms
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like the popular 24C16, 24C08, 24C04,.. In contrast to lm_sensor's eeprommer
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which supports 24C256-type eeproms 24C16ss use 1-byte addresses!
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Warning !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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!!! !
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!!! This program should only be used on external busses such as i2c-pport. !
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!!! !
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!!! Your computer may contain i2c-eeproms for saving data vital to its !
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!!! operation. If you are not careful you might overwrite this data with !
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!!! this program and your computer may no longer boot! !
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!!! !
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!!! An example are the EEPROMS on your SDRAM DIMMs, your computer may no !
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!!! longer detect the RAM module rendering it essentially USELESS! !
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!!! !
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!!! IBM Thinkpads are said to store their configuration data in a eeprom, !
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!!! if you manage to overwrite this eeprom you will have to send your !
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!!! computer to the manufacturer for a costly repair! !
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!!! !
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Warning !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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It has several options:
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-d devicenode
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set this to the device-node of the i2c-bus
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you want to use like /dev/i2c-0.
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Use /dev/i2c-1 for the second bus, i2c-2 for the third...
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The default /dev/i2c-0 should work most of the time.
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-a address
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set this to the device-address of your
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eeprom. For a 24C16 the address is hardcoded to
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0x50, which is -you guessed it- the default.
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For a 24C08 and smaller types you can choose which
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addresses they occupy by forcing the address-pins
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of the chip to High or Low so here the address may differ.
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-p number_of_pages
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set this to the number of pages you want to read
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from or write to the eeprom. The 24C16 maps it's
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pages to consecutive addresses on the i2c-bus so
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we will try to read 256 bytes from every i2c
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address between 'address' (inclusive) and
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'address + number_of_pages' (exclusive)...
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A 24C16 has 8 pages so that's the default for this
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parameter.
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-f filename
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read data from this file (when writing to eeprom) or
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write data to this file (when reading from eeprom).
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When reading a file that's smaller than the
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eeprom's storage size we will pad the eeprom
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with zeroes.
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If no file is given we will just read the
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eeprom (while in read-mode) and test it's presence
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this way. In write-mode we will just write zeroes
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to the eeprom.
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-w When '-w' is present we will *write* to the eeprom.
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If you do not specify '-w' we will read the contents
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of the eeprom.
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-y This flag will suppress the warning when you write to the
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eeprom. You will not be required to enter 'yes' so be careful
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when using this switch!
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I wrote that program to clear a 24C16 eeprom that sit's in my crappy
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satellite receiver because sometimes its Z80 processor likes to
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write garbage to it and then crash....
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No further testing besides writing a long series of "The quick brown
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fox jumps over the lazy dog!" and reading it back has been done so
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of course this comes without any warranty.
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Chris <chris@hedonism.cx>
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