1What: /sys/class/spi_master/spi<bus>/spi<bus>.<dev>/fram 2Date: June 2021 3KernelVersion: 5.14 4Contact: Jiri Prchal <jiri.prchal@aksignal.cz> 5Description: 6 Contains the FRAM binary data. Same as EEPROM, just another file 7 name to indicate that it employs ferroelectric process. 8 It performs write operations at bus speed - no write delays. 9 10What: /sys/class/spi_master/spi<bus>/spi<bus>.<dev>/sernum 11Date: May 2021 12KernelVersion: 5.14 13Contact: Jiri Prchal <jiri.prchal@aksignal.cz> 14Description: 15 Contains the serial number of the Cypress FRAM (FM25VN) if it is 16 present. It will be displayed as a 8 byte hex string, as read 17 from the device. 18 19 This is a read-only attribute. 20 21What: /sys/class/spi_master/spi<bus>/spi<bus>.<dev>/jedec_id 22Date: January 2026 23KernelVersion: 6.19 24Contact: Patrick Wicki <patrick.wicki@siemens.com> 25Description: 26 Contains the raw JEDEC ID bytes returned by the RDID (0x9f) command. The 27 bytes are exposed as a hex string in big-endian order as read from the 28 device. 29 30 This is a read-only attribute. 31