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 robert.sty...@gmail.com >> : >> >>> 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 >>>> <beagl...@googlegroups.com> 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/ >>>> >>> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/3b1beb76-64e6-4a79-964c-035429b5d81cn%40googlegroups.com.
