Review the SRM and the schematics. The write protect for the on-board EEPROM is a test point on the PCB.
On 5/26/2014 9:58 AM, Oscar Castiblanco wrote: > How can I take the write protection off?, is it hardware or software this > protection? > > On Tuesday, September 24, 2013 2:26:37 PM UTC+2, kiran gopalan wrote: >> >> Hi, >> >> I am trying to write to the main eeprom ( at i2c address 0x50) using the >> sysfs interface. >> >> I am able to read from this eeprom: >> >> ================= >> root@am335x-evm:/sys/bus/i2c/devices/1-0050# head -c 300 eeprom | hexdump >> -C >> 00000000 aa 55 33 ee 41 33 33 35 42 4e 4c 54 30 41 35 41 >> |.U3.A335BNLT0A5A| >> 00000010 31 38 31 33 42 42 42 4b 32 30 35 39 ff ff ff ff >> |1813BBBK2059....| >> 00000020 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >> |................| >> ================= >> >> But I am unable to write anything to this: >> >> ================= >> root@am335x-evm:/sys/bus/i2c/devices/1-0050# echo "TEST" > eeprom >> root@am335x-evm:/sys/bus/i2c/devices/1-0050# head -c 300 eeprom | hexdump >> -C >> 00000000 aa 55 33 ee 41 33 33 35 42 4e 4c 54 30 41 35 41 >> |.U3.A335BNLT0A5A| >> 00000010 31 38 31 33 42 42 42 4b 32 30 35 39 ff ff ff ff >> |1813BBBK2059....| >> 00000020 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >> |................| >> * >> 00000120 >> root@am335x-evm:/sys/bus/i2c/devices/1-0050# >> ================= >> >> I am not seeing any error messages in dmesg. >> >> AFAIK this EEPROM is write enabled and I am not required to do any extra >> configuration. >> >> Can anyone help me to make this work? >> >> >> Kiran >> >> >> >> > -- Charles Steinkuehler [email protected] -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
