# How to read/write EEPROM on MangOH Yellow

**URL:** <https://mangoh.discourse.group/t/how-to-read-write-eeprom-on-mangoh-yellow/9702>\
**Category:** Uncategorized\
**Created:** [October 7, 2021, 9:56am UTC](https://mangoh.discourse.group/t/how-to-read-write-eeprom-on-mangoh-yellow/9702 "2021-10-07T09:56:09Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![bruceke](https://avatars.discourse-cdn.com/v4/letter/b/0ea827/32.png) [@bruceke](https://mangoh.discourse.group/u/bruceke)\
**Post date:** [October 7, 2021, 9:56am UTC](https://mangoh.discourse.group/t/how-to-read-write-eeprom-on-mangoh-yellow/9702/1 "2021-10-07T09:56:09Z")

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There is an EEPROM (24AA32AF) on mangOH  
 ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/7/7031fef9088167d3cd67f088f5a41a8e19ef165f.png)

I can find it with i2ctool, but cannot find the device node under /sys/bus/i2c/devices  
 ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/a/ae2c3f37cd6ec6aca34c2dddb8f04a7e38738652.png)  
How do I create an EEPROM device node (e.g. /sys/bus/i2c/devices/4-0050/eeprom)?

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**Author:** ![bruceke](https://avatars.discourse-cdn.com/v4/letter/b/0ea827/32.png) [@bruceke](https://mangoh.discourse.group/u/bruceke)\
**Post date:** [October 8, 2021, 5:48am UTC](https://mangoh.discourse.group/t/how-to-read-write-eeprom-on-mangoh-yellow/9702/2 "2021-10-08T05:48:36Z")

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I found the root cause , it was caused by “mangoh\_yellow\_dev.ko” (some devices initial failed during insert module)