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Update (some things had becoming wrong by the time they had been
written) and include Vaio eeproms git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1620 7894878c-1315-0410-8ee3-d5d059ff63e0
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Jean Delvare committed
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+48
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@@ -11,15 +11,16 @@ Supported chips:
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Fairchild (www.fairchildsemi.com), and
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Microchip (www.microchip.com)
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Chip Size (bits) Address
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24C01 1K 0x50 (shadows at 0x51 - 0x57)
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24C01A 1K 0x50 - 0x57 (Typical device on DIMMs)
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24C02 2K 0x50 - 0x57
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24C04 4K 0x50, 0x52, 0x54, 0x56
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(additional data at 0x51, 0x53, 0x55, 0x57)
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24C08 8K 0x50, 0x54 (additional data at 0x51, 0x52,
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0x53, 0x55, 0x56, 0x57)
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24C16 16K 0x50 (additional data at 0x51 - 0x57)
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Chip Size (bits) Address
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24C01 1K 0x50 (shadows at 0x51 - 0x57)
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24C01A 1K 0x50 - 0x57 (Typical device on DIMMs)
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24C02 2K 0x50 - 0x57
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24C04 4K 0x50, 0x52, 0x54, 0x56
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(additional data at 0x51, 0x53, 0x55, 0x57)
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24C08 8K 0x50, 0x54 (additional data at 0x51, 0x52,
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0x53, 0x55, 0x56, 0x57)
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24C16 16K 0x50 (additional data at 0x51 - 0x57)
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Sony 2K 0x57
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Author: Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock
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@@ -49,9 +50,9 @@ Module Parameters
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Description
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-----------
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This is a simple EEPROM module meant to enable reading the first 128 bytes
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of an EEPROM (on a SDRAM DIMM). However, it will access serial EEPROMs
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on any I2C adapter. This module will probably need to be
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This is a simple EEPROM module meant to enable reading the first 256 bytes
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of an EEPROM (on a SDRAM DIMM for example). However, it will access serial
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EEPROMs on any I2C adapter. This module will probably need to be
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expanded. A /dev file interface would probably be more effective.
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This module was a programming exercise to get used to the new project
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organization laid out by Frodo, but it should be at least completely
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@@ -68,24 +69,22 @@ loaded before the ddcmon driver and there is no 'ignore' line in the
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/etc/sensors.conf file, the eeprom driver will latch onto the DDC monitor
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eeprom.
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Recent Sony Vaio laptops have an EEPROM at 0x57. We couldn't get the
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specification, so it is guess work and far from being complete.
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Lacking functionality:
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* Read bytes 128-255. There is no technical restriction for not doing
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this, but making a zillion dataxx-xx files would be a bit rediculous.
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EEPROMs on DIMMs shouldn't use the contents past byte 128, so we are fine.
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* Full support for larger devices (24C04, 24C08, 24C16). These are
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not typically found on a PC. These devices will appear as separate
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devices at multiple addresses, with every other 128-byte block inaccessable
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because of the missing 128-255 functionality.
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devices at multiple addresses.
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* Support for really large devices (24C32, 24C64, 24C128, 24C256, 24C5412).
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* Support for really large devices (24C32, 24C64, 24C128, 24C256, 24C512).
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These devices require two-byte address fields and are not supported.
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* Enable Writing. Again, no technical reason why not, but making it easy
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to change the contents of the EEPROMs (on DIMMs anyway) also makes it easy
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to disable the DIMMs until the values are restored somehow.
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to disable the DIMMs until the values are restored somehow.
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Use:
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@@ -100,25 +99,26 @@ Note:
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EEPROMs reported are not nessesarily all from DIMMs. Xeon processors, for
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example, have serial EEPROMs in them connected to the SMBus which will be
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found by the module. Take care to ignore the output of decode_dimms.pl for
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these EEPROMs.
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found by the module. Take care to ignore the output of decode-dimms.pl for
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these EEPROMs. There is decode-xeon.pl for them. Same applies to Vaio
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EEPROMs, which have decode-vaio.pl.
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The driver caches the data from the monitor and only rereads it
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from the eeprom if the cache is more than 5 minutes old.
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DECODE_DIMMS.PL
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Decode-dimms.pl
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---------------
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This Perl script attempts to make sense of the first 128 bytes of a SDRAM
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PC-100 DIMM. Using the 'Serial Presence Detect (SPD)' Spec (Rev1.2a)** from
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Intel. When finished, it will decode and report all the values defined in
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the spec. Much of the information is technical timing and interfacing info
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(probably not all used by the Bios or clocking IC.
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(probably not all used by the BIOS or clocking IC).
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Note: During testing, we noticed that many DIMMs have trucated SPD records.
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I'm not sure if these conform to an old spec, or if the manufacturers are
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simply just taking short-cuts. But, many DIMMs have all zeros stored past
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simply just taking shortcuts. But, many DIMMs have all zeros stored past
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byte 21. I asked an Intel SDRAM tester, Sat Kolli (skolli@smartm.com),
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about this and this is what he had to say:
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@@ -129,19 +129,38 @@ addresses. That will give you the module size and what devices are used. It
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is very difficult to verify if the module is PC-100, because of
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inconsistencies between spd data from different manufacturers. You could
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read the timing information or the special Intel bytes (126 & 127) but I do
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not know how many program that information.These inconsistencies may be
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not know how many program that information. These inconsistencies may be
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minimized if you or your customers stay with some of the better known
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manufacturers." (Thanks goes to Sat Kolli for his comments and help)
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manufacturers." (Thanks goes to Sat Kolli for his comments and help.)
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Use:
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After inserting the nessesary modules, run the script!
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After inserting the necessary modules, run the script!
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Notes:
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The script assumes that Perl can be found at /usr/bin/perl. If different,
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you will need to adjust the first line of the file accordingly, or else
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you will get a strange "decode_dimms.pl: no such file or directory" error.
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you will get a strange "decode-dimms.pl: no such file or directory" error.
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Also note that the script assumes that _all_ the eeproms belong to DIMMs,
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which may not be the case.
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Decode-vaio.pl
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--------------
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This Perl script looks for a Sony Vaio EEPROM at 0x57. If your system is not
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a Sony Vaio laptop, you just don't care. If your system is an old Vaio, you
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probably don't have an EEPROM on it and this script will be useless to you
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as well.
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Use:
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After inserting the necessary modules, run the script!
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Notes:
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The script assumes that Perl can be found at /usr/bin/perl. If different,
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you will need to adjust the first line of the file accordingly, or else
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you will get a strange "decode-vaio.pl: no such file or directory" error.
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