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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.
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