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-.\"-
-.\" Copyright (c) 2012 Robert N. M. Watson
-.\" 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
-.\" 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.
-.\"
-.Dd August 18, 2012
-.Dt ALTERA_SDCARD 4
-.Os
-.Sh NAME
-.Nm altera_sdcard
-.Nd driver for the Altera University Program Secure Data Card IP Core
-.Sh SYNOPSIS
-.Cd "device altera_sdcard"
-.Pp
-In
-.Pa /boot/device.hints :
-.Cd hint.altera_sdcardc.0.at="nexus0"
-.Cd hint.altera_sdcardc.0.maddr=0x7f008000
-.Cd hint.altera_sdcardc.0.msize=0x400
-.Sh DESCRIPTION
-The
-.Nm
-device driver provides support for the Altera University Program Secure Data
-Card (SD Card) IP Core device.
-A controller device,
-.Li altera_sdcardcX ,
-will be attached during boot.
-Inserted disks are presented as
-.Xr disk 9
-devices,
-.Li altera_sdcardX ,
-corresponding to the controller number.
-.Sh HARDWARE
-The current version of the
-.Nm
-driver supports the SD Card IP core as described in the August 2011 version of
-Altera's documentation.
-The core supports only cards up to 2G (CSD 0); larger cards, or cards using
-newer CSD versions, will not be detected.
-The IP core has two key limitations: a lack of interrupt support, requiring
-timer-driven polling to detect I/O completion, and support for only single
-512-byte block read and write operations at a time.
-The combined effect of those two limits is that the system clock rate,
-.Dv HZ ,
-must be set to at least 200 in order to accomplish the maximum 100KB/s data
-rate supported by the IP core.
-.Sh SEE ALSO
-.Xr disk 9
-.Rs
-.%T Altera University Program Secure Data Card IP Core
-.%D August 2011
-.%I Altera Corporation - University Program
-.%U ftp://ftp.altera.com/up/pub/Altera_Material/11.0/University_Program_IP_Cores/Memory/SD_Card_Interface_for_SoPC_Builder.pdf
-.Re
-.Sh HISTORY
-The
-.Nm
-device driver first appeared in
-.Fx 10.0 .
-.Sh AUTHORS
-The
-.Nm
-device driver and this manual page were
-developed 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.
-This device driver was written by
-.An Robert N. M. Watson .
-.Sh BUGS
-.Nm
-contains a number of work-arounds for IP core bugs.
-Perhaps most critically,
-.Nm
-ignores the CRC error bit returned in the RR1 register, which appears to be
-unexpectedly set by the IP core.
-.Pp
-.Nm
-uses fixed polling intervals are used for card insertion/removal and
-I/O completion detection; an adaptive strategy might improve performance by
-reducing the latency to detecting completed I/O.
-However, in our experiments, using polling rates greater than 200 times a
-second did not improve performance.
-.Pp
-.Nm
-supports only a
-.Li nexus
-bus attachment, which is appropriate for system-on-chip busses such as
-Altera's Avalon bus.
-If the IP core is configured off of another bus type, then additional bus
-attachments will be required.