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RD(4) Device Drivers Manual RD(4)

ramdisk driver

pseudo-device rd [

The rd driver enables use of system or user memory as a disk. Memory for the disk must be allocated and initialized inside the kernel image at build-time using the rdsetroot (a.out(5)) or elfrdsetroot (elf(5)) tool.

block mode ramdisk devices.
raw mode ramdisk devices.

The rdsetroot and elfrdsetroot tools are available as part of the distribution toolset.
May 31, 2007 OpenBSD-5.3