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kernel-iso: rewrite a bit

--- a/kernel-iso.md

+++ b/kernel-iso.md

@@ -1,28 +1,31 @@

-Building a kernel only 9front ISO

-===================================

+Building a kernel-only 9front ISO

+=================================

-For times in which PXE is not avaible, it can be useful

-to have access to an ISO file that just contains a kernel

-for booting machines and then having them tls/tcp boot from

-a file server. 

+In situations where PXE booting is not possible it can be useful to have

+an ISO file containing just the 9front kernel for booting the machine and

+having it continue with TLS/TCP mount of the file server.

-This guide will be assuming you have a file and auth server somewhere on your network,

-and that you plan to boot a amd64 kernel on the target machine.

+It is assumed that file and auth servers have already been set up.

-Lets start with a plan9.ini for our target system:

+Start with a `plan9.ini` with parameters suitable for the target machine

+and network.

-	bootfile=/amd64/9pc64

+`/tmp/plan9.ini`

+

 	cdboot=yes

-	mouseport=ps2

-	monitor=vesa

-	vgasize=1024x768x16

+	bootfile=/amd64/9pc64

 	auth=192.168.1.6

 	fs=192.168.1.5

 	user=moody

 	bootargs=tls

+	#

+	mouseport=ps2

+	monitor=vesa

+	vgasize=1024x768x16

+Create a `proto(2)` file describing the resultant ISO file tree:

-Next we will need a proto file for disk/mk9660:

+`/tmp/9boottree`

 	uid=sys

 	gid=sys

@@ -39,15 +42,18 @@

 	amd64	d775

 		9pc64	664

+Populate the source file tree.  This could be done by copying only the

+needed files into a temporary directory, but it is easier to reuse the

+root filesystem, replacing any files that need replacing — `plan9.ini`

+in this case:

-For a small script to generate the ISO file itself:

+	bind /tmp/plan9.ini /root/cfg/plan9.ini

-	#!/bin/rc

-	rfork n

-	bind /root /n/src9

-	bind plan9.ini /n/src9/cfg/plan9.ini

-	disk/mk9660 -c9j -B 386/9bootiso \

-		-p 9bootproto \

-		-s /n/src9 -v 'Plan 9' kern.iso

+Finally, build the ISO file with `disk/mk9660(8)`:

-This results in a `kern.iso` file being created in the current directory.

+	disk/mk9660 -c9j \

+		-B /386/9bootiso \

+		-s /root -p /tmp/9boottree \

+		-v 'Plan 9' kern.iso

+

+Burn the resulting `kern.iso` to a suitable drive.