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9a1b623ekvik extra: add phil9's github 1 year, 4 months ago

#Building a kernel-only 9front ISO

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.

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

Start with a plan9.ini with parameters suitable for the target machine and network.

/tmp/plan9.ini

cdboot=yes
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:

/tmp/9boottree

uid=sys
gid=sys
386	d775
	9bootfat	664
	9boothyb	664
	9bootiso	664
	mbr		664
	pbs		664

cfg	d775
	plan9.ini	664

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:

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

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

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.