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Date: Tue, 18 Jun 2024 15:51:15 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Guenter Roeck <linux@...ck-us.net>
Cc: linux-hwmon@...r.kernel.org, linux-i2c@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Wolfram Sang <wsa+renesas@...g-engineering.com>,
René Rebe <rene@...ctcode.de>,
Thomas Weißschuh <linux@...ssschuh.net>,
Armin Wolf <W_Armin@....de>, Stephen Horvath <s.horvath@...look.com.au>
Subject: Re: [PATCH v4 5/6] i2c: smbus: Support DDR5 SPD EEPROMs
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.
$ sensors
[…]
Then there is no change:
```
$ 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 ................
```
Kind regards,
Paul
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