.\"-
.\" Copyright (c) 2015-2016 SRI International
.\" All rights reserved.
.\"
.\" This software was developed 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.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\" $FreeBSD: releng/12.2/share/man/man4/cfi.4 297455 2016-03-31 15:16:22Z brueffer $
.\"
.Dd January 20, 2016
.Dt CFI 4
.Os
.Sh NAME
.Nm cfi ,
.Nm cfid
.Nd driver for Common Flash Interface (CFI) NOR flash
.Sh SYNOPSIS
.Cd "device cfi"
.Cd "device cfid"
.Cd "options CFI_SUPPORT_STRATAFLASH"
.Cd "options CFI_ARMEDANDDANGEROUS"
.Pp
In
.Pa /boot/device.hints :
.Cd hint.cfi.0.at="nexus0"
.Cd hint.cfi.0.maddr=0x74000000
.Cd hint.cfi.0.msize=0x4000000
.Pp
In DTS file:
.Cd flash@74000000 {
.Cd "  compatible =" Qo cfi-flash Qc ;
.Cd "  reg = <0x74000000 0x4000000>;"
.Cd };
.Sh DESCRIPTION
The
.Nm
device driver provides a management interface to NOR flash devices supporting
the Common Flash Interface (CFI) specification.
Its companion device
.Nm cfid
provides a
.Xr geom 4
disk interface to the device.
.Pp
Special support for features of the Intel StrataFlash line are available
with the
.Cd 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
.Cd CFI_ARMEDANDDANGEROUS
kernel option.
.Sh SEE ALSO
.Xr led 4
.Sh HISTORY
The
.Nm
device driver first appeared in
.Fx 8.0 .
.Sh AUTHORS
The
.Nm
driver was written by
.An Juniper Networks
with StrataFlash support by
.An Sam Leffler .
This manual page was written by SRI International and the University of
Cambridge Computer Laboratory under DARPA/AFRL contract
.Pq FA8750-10-C-0237
.Pq Do CTSRD Dc ,
as part of the DARPA CRASH research programme.