Re: [PATCH v4 5/6] i2c: smbus: Support DDR5 SPD EEPROMs

[Guenter Roeck]

Hi Paul,

On 6/18/24 03:25, Paul Menzel wrote:
[ ... ]
>      $ ls -l /sys/bus/i2c/drivers/spd5118/0-0050/eeprom
>      -r--r--r-- 1 root root 1024 Jun 18 12:17 /sys/bus/i2c/drivers /spd5118/0-0050/eeprom
>      $ cp /sys/bus/i2c/drivers/spd5118/0-0050/eeprom /tmp
>      cp: error reading '/sys/bus/i2c/drivers/spd5118/0-0050/eeprom': No such device or address

That suggests that the i801 driver got an error when trying some chip operation.
Unfortunately I have no idea what that error or the failed operation might be.

>      $ od -t x1 /sys/bus/i2c/drivers/spd5118/0-0050/eeprom
>      od: /sys/bus/i2c/drivers/spd5118/0-0050/eeprom: read error: No such device or address
>      0000000
>
> > sudo i2cdump -y -f 0 0x50
>
>      $ sudo LD_LIBRARY_PATH=~/src/i2c-tools/lib tools/i2cdump -y -f 0 0x50
>      No size specified (using byte-data access)
>      Error: Could not open file `/dev/i2c-0' or `/dev/i2c/0': No such file or directory
This should work after you load the "i2c-dev" module.

If you get it to work, please provide the output. Maybe it helps tracking down
the problem.

Thanks,
Guenter