Maybe kernel must have crc enabled for 2433 writes?
Last line implies something about writes.
config W1_SLAVE_DS2433
tristate "4kb EEPROM family support (DS2433)"
help
Say Y here if you want to use a 1-wire
4kb EEPROM family device (DS2433).
config W1_SLAVE_DS2433_CRC
bool "Protect DS2433 data with a CRC16"
depends on W1_SLAVE_DS2433
select CRC16
help
Say Y here to protect DS2433 data with a CRC16.
Each block has 30 bytes of data and a two byte CRC16.
Full block writes are only allowed if the CRC is valid.
/Sven
onsdag 30 september 2020 kl. 10:56:55 UTC+2 skrev Johan Lind:
> Well, I have an i2c memory on the same board and to read and write to that
> I can use the following commands:
> write
> cat data.eeprom > /sys/bus/i2c/devices/2-0057/eeprom
> read
> cat /sys/bus/i2c/devices/2-0057/eeprom | hexdump
>
> I did try your suggestion of using dd but I could not get it to work.
> root@beaglebone:/home/debian# dd if=/dev/zero
> of=/sys/bus/w1/devices/23-000002eddd9b/eeprom bs=32
> dd: error writing '/sys/bus/w1/devices/23-000002eddd9b/eeprom': Invalid
> argument
> 1+0 records in
> 0+0 records out
> 0 bytes copied, 0.0159578 s, 0.0 kB/s
> root@beaglebone:/home/debian#
>
> As the eeprom is written to contain data on another device, so I thought
> it would be enough to use /dev/zero as input.
> Reading out data show no change of content (as expected consider the
> output from dd)
> cat /sys/bus/w1/devices/23-000002eddd9b/eeprom | hexdump
> 0000000 00ff 55aa 00ff 55aa 00ff 55aa 00ff 55aa
> onsdag 30 september 2020 kl. 07:15:53 UTC+2 skrev Sven Norinder:
>
>> The eeprom probably is a device, not a filesystem.
>> Use dd instead.
>> /Sven
>>
>> tisdag 29 september 2020 kl. 17:59:14 UTC+2 skrev Johan Lind:
>>
>>> I tried with only a short (6 bytes) string but still the same behaviour.
>>>
>>>
>>> tisdag 29 september 2020 kl. 17:45:47 UTC+2 skrev
>>> [email protected]:
>>>
>>>> I suggest trying to write less than 32 bytes (the dmesg implies
>>>> something wrong with offset or count) -- create a file of less than 32
>>>> bytes and copy to eeprom
>>>> cd ~
>>>> echo "1234567890" > file10
>>>> cp -T file10 /sys/bus/w1/devices/23-000002eddd9b/eeprom
>>>>
>>>> In the data sheet you need a much smaller R[PU] to write than read
>>>> https://datasheets.maximintegrated.com/en/ds/DS2433.pdf
>>>>
>>>> On Tuesday, 29 September 2020 at 16:03:48 UTC+1 RobertCNelson wrote:
>>>>
>>>>> On Tue, Sep 29, 2020 at 9:55 AM 'Johan Lind' via BeagleBoard
>>>>> <[email protected]> wrote:
>>>>> >
>>>>> > Yes, it does still show eeprom
>>>>> >
>>>>> > debian@beaglebone:~$ ls /sys/bus/w1/devices/23-000002eddd9b
>>>>> > driver eeprom id name power subsystem uevent
>>>>> > debian@beaglebone:~$ ls /sys/bus/w1/devices/
>>>>> > 23-000002eddd9b w1_bus_master1
>>>>> > debian@beaglebone:~$
>>>>> > debian@beaglebone:~$ ls -al /sys/bus/w1/devices/23-000002eddd9b/
>>>>> > total 0
>>>>> > drwxrwxr-x 3 root gpio 0 Sep 29 14:00 .
>>>>> > drwxrwxr-x 4 root gpio 0 Sep 29 14:00 ..
>>>>> > lrwxrwxrwx 1 root gpio 0 Sep 29 14:00 driver ->
>>>>> ../../../bus/w1/drivers/w1_slave_driver
>>>>> > -rw-rw-r-- 1 root gpio 512 Sep 29 14:07 eeprom
>>>>>
>>>>> Side note, you don't' have to be root, the "gpio" group is the default
>>>>> for debian..
>>>>>
>>>>> > -r--r--r-- 1 root gpio 4096 Sep 29 14:00 id
>>>>> > -r--r--r-- 1 root gpio 4096 Sep 29 14:00 name
>>>>> > drwxrwxr-x 2 root gpio 0 Sep 29 14:00 power
>>>>> > lrwxrwxrwx 1 root gpio 0 Sep 29 14:00 subsystem -> ../../../bus/w1
>>>>> > -rw-rw-r-- 1 root gpio 4096 Sep 29 14:00 uevent
>>>>> > debian@beaglebone:~$
>>>>>
>>>>> not sure why you can't write...
>>>>>
>>>>> Regards,
>>>>>
>>>>> --
>>>>> Robert Nelson
>>>>> https://rcn-ee.com/
>>>>>
>>>>
--
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