1.\" $OpenBSD: rd.4,v 1.6 2013/10/18 17:42:36 jmc Exp $ 2.\" 3.\" This file is in the public domain. 4.\" 5.Dd $Mdocdate: October 18 2013 $ 6.Dt RD 4 7.Os 8.Sh NAME 9.Nm rd 10.Nd ramdisk driver 11.Sh SYNOPSIS 12.Cd "pseudo-device rd" Op Ar count 13.Sh DESCRIPTION 14The 15.Nm 16driver enables use of system or user memory as a disk. 17Memory for the disk must be allocated and initialized inside the 18kernel image at build-time using the 19.Cm elfrdsetroot 20tool. 21.Pp 22The 23.Cm elfrdsetroot 24tool is available as part of the distribution toolset. 25.Sh FILES 26.Bl -tag -width /dev/rrd??XXX -compact 27.It Pa "/dev/rd??" 28Block mode ramdisk devices. 29.It Pa "/dev/rrd??" 30Raw mode ramdisk devices. 31.El 32.Sh SEE ALSO 33.Xr elf 5 34