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Manual Pages  — CFI


cfi, cfid – driver for Common Flash Interface (CFI) NOR flash



device cfi device cfid options CFI_SUPPORT_STRATAFLASH options CFI_ARMEDANDDANGEROUS

In /boot/device.hints: hint.cfi.0.at="nexus0" hint.cfi.0.maddr=0x74000000 hint.cfi.0.msize=0x4000000

In DTS file: flash@74000000 { compatible = Qo cfi-flash Qc ; reg = <0x74000000 0x4000000>; };


The cfi device driver provides a management interface to NOR flash devices supporting the Common Flash Interface (CFI) specification. Its companion device cfid provides a geom(4) disk interface to the device.

Special support for features of the Intel StrataFlash line are available with the CFI_SUPPORT_STRATAFLASH kernel option. Additional support for write-once bits to switch part of Intel StrataFlash devices to read-only can be enabled by the CFI_ARMEDANDDANGEROUS kernel option.




The cfi device driver first appeared in FreeBSD 8.0 .


The cfi driver was written by Juniper Networks with StrataFlash support by Sam Leffler. This manual page was written by SRI International and the University of Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) ("CTSRD "), as part of the DARPA CRASH research programme.

CFI (4) January 20, 2016

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Please direct any comments about this manual page service to Ben Bullock.

"I liken starting one's computing career with Unix, say as an undergraduate, to being born in East Africa. It is intolerably hot, your body is covered with lice and flies, you are malnourished and you suffer from numerous curable diseases. But, as far as young East Africans can tell, this is simply the natural condition and they live within it. By the time they find out differently, it is too late. They already think that the writing of shell scripts is a natural act."
— Ken Pier, Xerox PARC