Hello,
On a ASUS X670E (AMD AM5 platform) board, I am unable to read the
eeprom for my memory (through decode-dimms). The SMBus is driven by
piix4_smbus.
i2cdetect -l lists the following:
i2c-0 i2c Synopsys DesignWare I2C adapter I2C adapter
i2c-1 i2c NVIDIA i2c adapter 2 at 1:00.0 I2C adapter
i2c-2 i2c NVIDIA i2c adapter 3 at 1:00.0 I2C adapter
i2c-3 i2c NVIDIA i2c adapter 4 at 1:00.0 I2C adapter
i2c-4 i2c NVIDIA i2c adapter 5 at 1:00.0 I2C adapter
i2c-5 i2c NVIDIA i2c adapter 6 at 1:00.0 I2C adapter
i2c-6 smbus SMBus PIIX4 adapter port 0 at 0b00 SMBus adapter
i2c-7 smbus SMBus PIIX4 adapter port 2 at 0b00 SMBus adapter
i2c-8 smbus SMBus PIIX4 adapter port 1 at 0b20 SMBus adapter
Looking at i2c-6:
i2cdetect -y 6 0x50 0x70
0 1 2 3 4 5 6 7 8 9 a b c d e f
00:
10:
20:
30:
40:
50: -- 51 -- 53 -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: --
I think those are the memory eeproms. If I bind them to ee1004 as so:
echo ee1004 0x51 >/sys/bus/i2c/devices/i2c-6/new_device
echo ee1004 0x53 >/sys/bus/i2c/devices/i2c-6/new_device
The kernel prints:
[ 1642.373579] ee1004 6-0051: 512 byte EE1004-compliant SPD EEPROM, read-only
[ 1642.373588] i2c i2c-6: new_device: Instantiated device ee1004 at 0x51
[ 1645.328289] ee1004 6-0053: 512 byte EE1004-compliant SPD EEPROM, read-only
[ 1645.328299] i2c i2c-6: new_device: Instantiated device ee1004 at 0x53
But then when I use decode-dimms, the kernel is unable to select page 0:
[ 1697.112564] ee1004 6-0051: Failed to select page 0 (-6)
[ 1702.581605] ee1004 6-0051: Failed to select page 0 (-6)
I tried looking for a SPD write enable/disable option in the system
firmware but didn't see any (I am trying to confirm if that feature
exists or not).
All this on 6.2.11-arch1-1.
