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.\" Copyright (c) 2011 Aleksandr Rybalko
.\" 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 AUTHOR 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 AUTHOR 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.
.\"
.\" $FreeBSD$
.\"
.Dd April 3, 2011
.Dt NVRAM2ENV 4
.Os
.Sh NAME
.Nm nvram2env
.Nd "copy nvram-like data into kernel environment"
.Sh SYNOPSIS
.Cd "device nvram2env"
.Sh DESCRIPTION
.Nm
implements a simple method of reading the NVRAM-like data and information
stored in flash and storing it in the kernel environment. It can then be
used by various device drivers at boot-time.
.Pp
The NVRAM-like data is an array of zero terminated strings. Each string contains
the string name, "=" delimiter and the string value.
.Pp
.Nm
copies the environment values into kernel environment using the kernel setenv call.
.Pp
Configuration of
.Nm
is done in
.Xr device.hints 5
defining the NVRAM base address, fallback base address, maxsize and flags.
.Pp
.Nm
is currently MIPS-specific.
.Ss base
base - physical address where data block is stored.
.Ss fallbackbase
fallbackbase - physical address where data block is stored, but only
if not found at base.
.Ss maxsize
maxsize - maximum size of data block.
.Ss flags
flags - control flags, used to select nvram type and enable/disable CRC check.
.Bl -tag -width indent
.It Fa 0x0001
Avoid CRC checking. Currently CRC checking is not implemented, so to be future
compatible, please set it to "1".
.It Fa 0x0002
Use format "Generic", skip uint32_t field, then zero terminating array of
strings.
.It Fa 0x0004
Use Broadcom CFE format. uint32_t signature "FLSH", uint32_t size,
three unused fields uint32_t, then data.
.It Fa 0x0008
Use U-Boot format, uint32_t crc, then zero terminating array of strings.
.El
.Sh EXAMPLES
Usage in U-Boot case:
.Bd -literal -offset indent
hint.nvram.0.base=0x1f030000
hint.nvram.0.maxsize=0x2000
hint.nvram.0.flags=3 # 1 = No check, 2 = Format Generic
hint.nvram.1.base=0x1f032000
hint.nvram.1.maxsize=0x4000
hint.nvram.1.flags=3 # 1 = No check, 2 = Format Generic
.Ed
.Pp
CFE nvram with fallback:
.Bd -literal -offset indent
hint.nvram.0.base=0x1fff8000
hint.nvram.0.fallbackbase=0x1fc00400
hint.nvram.0.flags=4 # 4 = Format Broadcom
.Ed
.Pp
but seems for CFE nvram preferred to read both blocks:
.Pp
NVRAM partition: Static, CFE internal
.Bd -literal -offset indent
hint.nvram.0.flags=0x05 # Broadcom + nocheck
hint.nvram.0.base=0x1fc00400
.Ed
.Pp
Dynamic, editable form CFE, override values from first
.Bd -literal -offset indent
hint.nvram.1.flags=0x05 # Broadcom + nocheck
hint.nvram.1.base=0x1cff8000
.Ed
.Sh SEE ALSO
.Xr kenv 1 ,
.Xr kenv 2 .
.Sh HISTORY
.Nm
first appeared in
.Fx 9.0 .
.Sh AUTHORS
.An -nosplit
.Nm
.An Aleksandr Rybalko Aq ray@ddteam.net .
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