From: Joe Burmeister > Sent: 09 August 2019 13:54 > > Many, though not all, AT25s have an instruction for chip erase. > If there is one in the datasheet, it can be added to device tree. > Erase can then be done in userspace via the sysfs API with a new > "erase" device attribute. This matches the eeprom_93xx46 driver's > "erase". Is it actually worth doing though? I'm guessing that device erase can easily take over a minute. When I looked at 'device erase' on an EEPROM it took just as long as erasing the sectors one at a time - but without the warm cosy feeling that progress was being made. Not only that you can't really interrupt the erase, so either the application has to sleep uninterruptibly for the duration or you have to have some kind of 'device busy' response while it is done asynchronously. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
