EE1004

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[https://www.jedec.org/category/keywords/ee1004-v EE1004-v] is a JEDEC standard for [[SPD]] published May 2022. It is used in DDR4+ DIMMs, and has its own kernel module, <tt>ee1004</tt>, ~~updating~~ the <tt>at24</tt> module.

[https://www.jedec.org/category/keywords/ee1004-v EE1004-v] is a JEDEC standard for [[SPD]] published May 2022. It is used in DDR4+ DIMMs, and has its own kernel module, <tt>ee1004</tt>, superseding the <tt>at24</tt> module used for AT24C02 EEPROMs. These are 512-byte devices accessed through a single I2C address; SMBus controls whether the upper or lower page is accessed.

==~~Reading~~ EE1004==

==Binding EE1004==

Load the <tt>eeprom</tt> and <tt>ee1004</tt> modules (the former is still necessary for <tt>decode-dimms</tt> to function, but is deprecated). Determine which DIMMs are populated via addresses 0x50--0x57 on an ~~SMBUS~~-type I2C connection. Here, buses 0 and 1 are ~~SMBUS~~ (using the <tt>i2c-piix4</tt> module).

Load the <tt>eeprom</tt> and <tt>ee1004</tt> modules (the former is still necessary for <tt>decode-dimms</tt> to function, but is deprecated). Determine which DIMMs are populated via addresses 0x50--0x57 on an SMBus-type I2C connection. Here, buses 0 and 1 are SMBus (using the <tt>i2c-piix4</tt> module).

<pre>

[schwarzgerat](0) $ i2cdetect -l

Line 24:

[schwarzgerat](0) $

</pre>

Here, we see my 8 DIMMs populating addresses 0x50 through 0x57. We now must associate these addresses with <tt>ee1004</tt>:

<pre>

[schwarzgerat](0) $ for i in `seq 0 7` ; do echo ee1004 0x5$i | sudo tee /sys/bus/i2c/devices/i2c-0/new_device ; done

ee1004 0x50

ee1004 0x51

ee1004 0x52

ee1004 0x53

ee1004 0x54

ee1004 0x55

ee1004 0x56

ee1004 0x57

[schwarzgerat](1) $

</pre>

At this point, <tt>decode-dimms</tt> ought be able to pull the EE1004 information. Try using <tt>decode-dimms --side-by-side</tt> for more compact presentation.

==External links==

* [https://en.wikipedia.org/wiki/Serial_presence_detect Serial presence detect] on wikipedia

EE1004: Difference between revisions

Dank (talk | contribs)

@@ Line 1: / Line 1: @@
-[https://www.jedec.org/category/keywords/ee1004-v EE1004-v] is a JEDEC standard for [[SPD]] published May 2022. It is used in DDR4+ DIMMs, and has its own kernel module, <tt>ee1004</tt>, updating the <tt>at24</tt> module.
+[https://www.jedec.org/category/keywords/ee1004-v EE1004-v] is a JEDEC standard for [[SPD]] published May 2022. It is used in DDR4+ DIMMs, and has its own kernel module, <tt>ee1004</tt>, superseding the <tt>at24</tt> module used for AT24C02 EEPROMs. These are 512-byte devices accessed through a single I2C address; SMBus controls whether the upper or lower page is accessed.
-==Reading EE1004==
+==Binding EE1004==
-Load the <tt>eeprom</tt> and <tt>ee1004</tt> modules (the former is still necessary for <tt>decode-dimms</tt> to function, but is deprecated). Determine which DIMMs are populated via addresses 0x50--0x57 on an SMBUS-type I2C connection. Here, buses 0 and 1 are SMBUS (using the <tt>i2c-piix4</tt> module).
+Load the <tt>eeprom</tt> and <tt>ee1004</tt> modules (the former is still necessary for <tt>decode-dimms</tt> to function, but is deprecated). Determine which DIMMs are populated via addresses 0x50--0x57 on an SMBus-type I2C connection. Here, buses 0 and 1 are SMBus (using the <tt>i2c-piix4</tt> module).
 <pre>
 [schwarzgerat](0) $ i2cdetect -l
@@ Line 24: / Line 24: @@
 [schwarzgerat](0) $
 </pre>
+Here, we see my 8 DIMMs populating addresses 0x50 through 0x57. We now must associate these addresses with <tt>ee1004</tt>:
+<pre>
+[schwarzgerat](0) $ for i in `seq 0 7` ; do echo ee1004 0x5$i | sudo tee /sys/bus/i2c/devices/i2c-0/new_device ; done
+ee1004 0x50
+ee1004 0x51
+ee1004 0x52
+ee1004 0x53
+ee1004 0x54
+ee1004 0x55
+ee1004 0x56
+ee1004 0x57
+[schwarzgerat](1) $
+</pre>
+At this point, <tt>decode-dimms</tt> ought be able to pull the EE1004 information. Try using <tt>decode-dimms --side-by-side</tt> for more compact presentation.
+==External links==
+* [https://en.wikipedia.org/wiki/Serial_presence_detect Serial presence detect] on wikipedia