Re: [ee1004] Failed to select page 0 - G.Skill Trident Z5 NEO DDR5, ASUS X670E board - 6.2.11-arch1-1

[Wolfram Sang <wsa@kernel.org>]

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CCing Jean Delvare...

On Thu, Apr 20, 2023 at 03:51:38PM -0700, Jean-François Roy wrote:
> 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.

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