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Indicating the difference between a kernel only boot disk and 2 disk compression 

in FAQ 13.
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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 1.65 2002/01/07 19:24:44 freesource Exp $</center> <center>$Id: index.html,v 1.66 2002/01/07 19:27:21 freesource Exp $</center>
<p> <p>
@ -1104,13 +1104,20 @@ filesystem.</P>
<p> <p>
If you are creating a single 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, 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.&nbsp;&nbsp; media, and then rdeved in such a way that it knows that the ramdisk and the
However, in order to boot /dev/fd0 from /dev/fd0 the kernel has to prompt
flag are on, i.e., rdev -r /dev/fd0 49152, and that the root filesystem starts
at block
0 on the other floppy.&nbsp;&nbsp;
However, the 2 disk compression method just copies over the root filesystem
to the second disk.&nbsp&nbsp;In order to boot /dev/fd0 from /dev/fd0 when
the root
filesystem is just copied over, 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 remounts that disk.&nbsp;&nbsp;In order to accomplish this, an initrd is it remounts that disk.&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
@ -1137,7 +1144,10 @@ distribution or derivative of
one.&nbsp&nbsp; one.&nbsp&nbsp;
The advantage of a two disk boot/root The advantage of a two disk boot/root
system is related to the fact that modern kernels are themselves quite system is related to the fact that modern kernels are themselves quite
large, leaving very little room for a root filesystem.&nbsp;&nbsp; large, leaving very little room for a root filesystem, but at the same
time it is convenient to have a boot loader like lilo because it allows
you to boot other root filesystems which is useful in emergency
situations.&nbsp;&nbsp;
The present ABS The present ABS
(boot section) is descended from some pretty old historic code from the (boot section) is descended from some pretty old historic code from the
original bootroot and is due original bootroot and is due

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