83 lines
2.8 KiB
Groff
83 lines
2.8 KiB
Groff
.\" $NetBSD: seeprom.4,v 1.6 2013/10/25 22:15:02 wiz Exp $
|
|
.\"
|
|
.\" Copyright (c) 2007 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
.\" POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.Dd October 25, 2013
|
|
.Dt SEEPROM 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm seeprom
|
|
.Nd 24-series I2C EEPROM driver
|
|
.Sh SYNOPSIS
|
|
.Cd "seeprom0 at iic0 addr 0x51: AT24Cxx or compatible EEPROM: size 256"
|
|
.Cd "seeprom16 at iic1 addr 0x57: power-supply: size 8192"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
driver provides support for the ATMEL 24-series of I2C EEPROMs, and
|
|
compatibles, available from a variety of vendors.
|
|
The Philips PCF8582 is also supported, as compatible with the
|
|
AT24C02.
|
|
.Pp
|
|
Access to the contents of the memory is through a character device.
|
|
.Pp
|
|
The size of the EEPROM is either read from the firmware, or can be set
|
|
using the flags keyword in the kernel configuration.
|
|
The value of the flag represents the EEPROM size in Kbit.
|
|
.Bl -column -offset indent "flags" "EEPROM size in bytes"
|
|
.It Sy flags Ta Sy EEPROM size in bytes
|
|
.It Li 1 Ta 128
|
|
.It Li 2 Ta 256
|
|
.It Li 4 Ta 512
|
|
.It Li 8 Ta 1024
|
|
.It Li 16 Ta 2048
|
|
.It Li 32 Ta 4096
|
|
.It Li 64 Ta 8192
|
|
.It Li 128 Ta 16384
|
|
.It Li 256 Ta 32768
|
|
.It Li 512 Ta 65536
|
|
.El
|
|
.Sh EXAMPLES
|
|
Indirect configuration:
|
|
.Dl seeprom* at iic? addr 0x51 flags 0x2
|
|
Direct configuration:
|
|
.Dl seeprom* at iic? addr?
|
|
.Sh SEE ALSO
|
|
.Xr iic 4
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
device appeared in
|
|
.Nx 2.0 .
|
|
.Sh BUGS
|
|
AT24C1024 EEPROM's are not supported.
|
|
.Pp
|
|
Software write protection on the AT34Cxx EEPROMs is not supported.
|
|
.Pp
|
|
The
|
|
.Nm
|
|
driver reads and writes one byte at a time to be compatible with all
|
|
controllers.
|