Loopback Device: Difference between revisions
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The linux loopback device can be used by root only, and needs to be enabled in the kernel before use.
=== Floppy Disk Images With GRUB and EXT2 ===
First, lets create a empty image.
dd if=/dev/zero of=floppy.img bs=512 count=2880
Now, lets set it up for mounting.
losetup /dev/loop0 floppy.img
Now lets make it EXT2 formatted.
mkfs -t ext2 /dev/loop0
Mount!
mount -t ext2 /dev/loop0 /mnt/myfloppy
Create GRUB directory.
cd /mnt/myfloppy
mkdir grub
Copy GRUB's second stage files.
cp /lib/grub/i386-pc/stage[12] /mnt/myfloppy/grub
Create a device mapping for the GRUB installation.
echo (fd0) /dev/loop0 > /mnt/myfloppy/grub/device.map
Start GRUB console for installation into the boot record.
grub --device-map=/mnt/myfloppy/grub/device.map /dev/loop0
In the GRUB console:
root (fd0)
setup (fd0)
NOTE: You must unmount /mnt/myfloppy before using a emulator to directly read /dev/loop0 such as.
qemu -fda /dev/loop0
NOTE: When deleting the loop device the original floppy.img file will be saved with the modified contents.
=== Floppy Disk Images With FAT16 ===
First, lets create an empty image.
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