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337 lines
6.0 KiB
337 lines
6.0 KiB
4 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<HTML
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><HEAD
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><TITLE
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>Mounting a disk image using the loop device</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
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REL="HOME"
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TITLE="Bochs User Manual"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Tips and Techniques"
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HREF="howto.html"><LINK
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REL="PREVIOUS"
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TITLE="Screen saver turns on too quickly"
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HREF="screensaver.html"><LINK
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REL="NEXT"
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TITLE="Simulating a Symmetric Multiprocessor (SMP) Machine"
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HREF="smp.html"></HEAD
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><BODY
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CLASS="SECTION"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Bochs User Manual</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="screensaver.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 8. Tips and Techniques</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="smp.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECTION"
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><H1
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CLASS="SECTION"
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><A
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NAME="LOOP-DEVICE-USAGE"
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>8.7. Mounting a disk image using the loop device</A
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></H1
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><P
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>This section describes how to access a floppy or hard disk image within Linux
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using the loop device. Why would you want to do this? Let's say you have made
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a small Linux disk image for Bochs, and you want to install some more software
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on it. You have already downloaded the software onto your real system, so now
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you want to transfer it to the Bochs disk image. A fast way to transfer
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the files is to mount the disk image using the loop device.</P
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><DIV
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CLASS="SECTION"
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><H2
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CLASS="SECTION"
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><A
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NAME="AEN2822"
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>8.7.1. ...on Linux</A
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></H2
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><P
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>This section was contributed by Volker Ruppert.
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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>Today I have made some tests with the loop device, because I want to exchange
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files with the bochs disk images. This is what I found out:
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1. Using Floppy images is easy, because there is no partition table:
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losetup /dev/loop0 /usr/local/bochs/dlxlinux/floppya.img
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Now you can use the image like a real floppy:
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- format : mkfs.minix /dev/loop0
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- filesystem check : fsck.minix /dev/loop0
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- mount : mount /dev/loop0 -o loop /mnt/floppy
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Before you want to restart bochs you must do this:
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losetup -d /dev/loop0
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Don't forget to umount before.
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2. If you want access to a hard disk image, you have to calculate the size of
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the first cylinder. This value is the offset argument for losetup.
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offset = bytes per sector * sectors per cylinder
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The command for dlxlinux image looks like this:
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losetup /dev/loop0 /usr/local/bochs/dlxlinux/hd10meg.img -o 8704
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For images created by bximage you must use the value 32256.
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3. The hard disk image access doesn't work if the image contains more than
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one partition.
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4. I have made this tests with Linux and I don't know how
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this could be done with other operating systems.</PRE
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></TD
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></TR
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></TABLE
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></P
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></DIV
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><DIV
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CLASS="SECTION"
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><H2
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CLASS="SECTION"
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><A
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NAME="AEN2826"
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>8.7.2. ...on FreeBSD</A
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></H2
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><P
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>This section was contributed by Alexander Schuch.</P
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><P
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>The following example mounts a Windows 95 hard disk image called <TT
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CLASS="FILENAME"
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>Windows 95 B (2031-16-63)</TT
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>
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into the FreeBSD file system. It is specific to FreeBSD 5.x; for
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hints on how to do the same task on FreeBSD 4.x, or for more information in
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general, check the proper section of the FreeBSD handbook:
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<A
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HREF="http://www.freebsd.org/doc/en/books/handbook/disks-virtual.html"
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TARGET="_top"
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>Network, Memory, and File-Backed File Systems</A
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>.
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You can use the same procedure for mounting floppy disk images.</P
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><P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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><SAMP
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CLASS="PROMPT"
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>#</SAMP
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> <KBD
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CLASS="USERINPUT"
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>mdconfig -a -t vnode -f "Windows 95 B (2031-16-63)"</KBD
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>
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md0</PRE
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></TD
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></TR
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></TABLE
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>
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mdconfig returns the device, your file now is accessable from.
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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><SAMP
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CLASS="PROMPT"
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>#</SAMP
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> <KBD
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CLASS="USERINPUT"
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>mount -t msdosfs /dev/md0s1 /mnt</KBD
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></PRE
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></TD
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></TR
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></TABLE
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>
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If you already have other md devices configured, you need to substitute md0s1
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with, for example, md6s1.</P
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><P
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>Once you are done working with the image, unmount the md device and detach it.
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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><SAMP
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CLASS="PROMPT"
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>#</SAMP
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> <KBD
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CLASS="USERINPUT"
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>umount /mnt</KBD
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>
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<SAMP
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CLASS="PROMPT"
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>#</SAMP
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> <KBD
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CLASS="USERINPUT"
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>mdconfig -d -u 0</KBD
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></PRE
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></TD
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></TR
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></TABLE
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>
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And again, if there are other md devices configured, use the proper device
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number. In case you forgot the number, just ask <B
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CLASS="COMMAND"
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>mdconfig</B
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>, like:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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><SAMP
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CLASS="PROMPT"
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>#</SAMP
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> <KBD
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CLASS="USERINPUT"
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>mdconfig -l</KBD
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>
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md7
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<SAMP
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CLASS="PROMPT"
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>#</SAMP
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> <KBD
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CLASS="USERINPUT"
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>mdconfig -d -u 7</KBD
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></PRE
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></TD
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></TR
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></TABLE
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></P
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="screensaver.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="smp.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Screen saver turns on too quickly</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="howto.html"
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ACCESSKEY="U"
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>Up</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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|
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>Simulating a Symmetric Multiprocessor (SMP) Machine</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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>
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