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Even better FAQ 13 explanation.

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freesource 23 years ago
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      doc/html/index.html

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@ -3,7 +3,7 @@
<body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E" <body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E"
alink="#FF0000"> alink="#FF0000">
<center>$Id: index.html,v 1.66 2002/01/07 19:27:21 freesource Exp $</center> <center>$Id: index.html,v 1.67 2002/01/09 18:40:19 freesource Exp $</center>
<p> <p>
@ -1105,19 +1105,26 @@ filesystem.</P>
<p> <p>
If you are creating a boot disk in which the kernel knows where to If you are creating a boot disk in which the kernel knows where to
find the root filesystem, then nothing else but a kernel is required find the root filesystem and the root filesystem is uncompressed, then nothing
else but a kernel is required
assuming it is copied in a way that is starts at block 0 on the device assuming it is copied in a way that is starts at block 0 on the device
media, and then rdeved in such a way that it knows that the ramdisk and the media, and then rdeved in such a way that it knows that the ramdisk and the
prompt prompt
flag are on, i.e., rdev -r /dev/fd0 49152, and that the root filesystem starts flag are on, i.e., rdev -r /dev/fd0 49152, and that the root filesystem starts
at block at block
0 on the other floppy.&nbsp;&nbsp; 0 on the other floppy.&nbsp;&nbsp;
However, the 2 disk compression method just copies over the root filesystem However, the 2 disk compression method copies over a compressed root
filesystem
to the second disk.&nbsp&nbsp;In order to boot /dev/fd0 from /dev/fd0 when to the second disk.&nbsp&nbsp;In order to boot /dev/fd0 from /dev/fd0 when
the root the root
filesystem is just copied over, the kernel has to filesystem is compressed the kernel has to
mount the initial boot disk, and then after the new root disk is inserted, mount the initial boot disk, and then after the new root disk is inserted it
it remounts that disk.&nbsp;&nbsp;In order to accomplish this an initrd is uncompresses the root filesystem and then changes over to the real root
device,
which in this case is /dev/ram1 where the uncompressed filesystem now
resides.
&nbsp;&nbsp;
In order to accomplish this an initrd is
required.&nbsp;&nbsp; required.&nbsp;&nbsp;
Initial ram disks are essentially mini filesystems with the Initial ram disks are essentially mini filesystems with the
bare necessities to allow a special init type file called linuxrc to bare necessities to allow a special init type file called linuxrc to

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