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

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On 6/18/24 06:51, Paul Menzel wrote:
Dear Guenter,


Am 18.06.24 um 15:32 schrieb Guenter Roeck:

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.

Silly me. Thank you.

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

```
$ sudo LD_LIBRARY_PATH=~/src/i2c-tools/lib tools/i2cdump -y -f 0 0x50
No size specified (using byte-data access)
      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 51 18 0a 86 32 03 32 00 00 00 00 00 ff 01 00 00    Q???2?2......?..
10: 00 00 00 00 00 00 00 00 00 00 00 00 70 03 00 00    ............p?..
20: 50 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00    P?..............
30: 00 58 01 00 00 00 00 00 00 00 00 00 00 00 00 00    .X?.............
40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
80: 30 10 12 02 04 00 20 62 00 00 00 00 90 02 00 00    0????. b....??..
90: 00 00 00 00 a0 01 f2 03 7a 0d 00 00 00 00 80 3e    ....????z?....?>
a0: 80 3e 80 3e 00 7d 80 bb 30 75 27 01 a0 00 82 00    ?>?>.}??0u'??.?.
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
c0: 00 00 00 00 00 00 88 13 08 88 13 08 20 4e 20 10    ......?????? N ?
d0: 27 10 15 34 20 10 27 10 c4 09 04 4c 1d 0c 00 00    '??4 ?'????L??..
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
```

So (00,b) = 0x00 opposed to 0x07 in your example output.


Yes, that assumed that reading the nvram/eeprom succeeded, which it didn't.
The value might also be 7 directly after booting and before loading
the spd5118 driver.

Anyway, it almost looks like setting the page doesn't work, or maybe write
operations in general.

Can you try the following ?

dd if=/sys/bus/i2c/drivers/spd5118/0-0050/eeprom of=/tmp/eeprom count=64 bs=1

and

dd if=/sys/bus/i2c/drivers/spd5118/0-0050/eeprom of=/tmp/eeprom count=1 bs=64

That should only try to read from page 0.

Also, please try to set a temperature limit, either temp1_max
or temp1_crit. Setting temp1_max to, say, 56000, or temp1_crit
to 84000 should do.

Thanks,
Guenter





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