how to check if there is write access to it ? about overclockspd HOT 1 CLOSED

AMD Rome has DDR4? My tools do not support DDR4 yet.

Proceed at your own risk:
First we need to find where your RAM SPD is in the smbus.

Run i2cdetect -lt to list available SMBUS. Find this line **i2c-x** unknown SMBus I801 adapter
i2c-0 could be different numbers (i2c-1, i2c-2, i2c-3, .... i2c-7)

Run i2cdetect -y # (replace # with the number of the bus you found)
Example: i2cdetect -y 5

Ram is usually in 0x50-0x54 (but not always, exotic architectures may have it in a different location)

Run i2cdump -y # 0x50 and see if it is your RAM.
Example: i2cdump -y 7 0x50 (for my T430 thinkpad)

Only proceed from now on if you know its your RAM SPD.

Write to an empty location in RAM SPD to see if it sticks. (byte 240 of the SPD works)
Run i2cset -y #busnumber #ramlocation 240 0xff
Example: i2cset -y 7 0x54 240 0xff

Then read that location again:
Run i2cget -y #busnumber #ramlocation 240
Example: i2cget -y 7 0x54 240

If the read did not give you 0xff then the chip is locked. You need to replace DIMM EEPROM with a new one.

from overclockspd.