| What: /sys/class/spi_master/spi<bus>/spi<bus>.<dev>/fram | |
| Date: June 2021 | |
| KernelVersion: 5.14 | |
| Contact: Jiri Prchal <jiri.prchal@aksignal.cz> | |
| Description: | |
| Contains the FRAM binary data. Same as EEPROM, just another file | |
| name to indicate that it employs ferroelectric process. | |
| It performs write operations at bus speed - no write delays. | |
| What: /sys/class/spi_master/spi<bus>/spi<bus>.<dev>/sernum | |
| Date: May 2021 | |
| KernelVersion: 5.14 | |
| Contact: Jiri Prchal <jiri.prchal@aksignal.cz> | |
| Description: | |
| Contains the serial number of the Cypress FRAM (FM25VN) if it is | |
| present. It will be displayed as a 8 byte hex string, as read | |
| from the device. | |
| This is a read-only attribute. | |
| What: /sys/class/spi_master/spi<bus>/spi<bus>.<dev>/jedec_id | |
| Date: January 2026 | |
| KernelVersion: 6.19 | |
| Contact: Patrick Wicki <patrick.wicki@siemens.com> | |
| Description: | |
| Contains the raw JEDEC ID bytes returned by the RDID (0x9f) command. The | |
| bytes are exposed as a hex string in big-endian order as read from the | |
| device. | |
| This is a read-only attribute. |