Configure the cpu server for plan 9 on Raspberry Pi

First add your user to the adm group. See fossil-p9.

Afterwards, set	your timezone, see timezone-p9.ms.

Next, make sure	to configure your network  information.	 See
ndb-p9.ms.

Now, we	prepare	rc scripts that	must run on system bootup:

term%  mkdir   /cfg/$sysname/	term%	dircp	/cfg/example
/cfg/$sysname/

Now, we	need to	configure networking. On  Raspberry  Pi,  we
are  using  wifi  and  dynamic networking, so we need to add
these lines:

bind  -a  '#l1'	 /net  echo  'key  proto=wpapsk	 essid=ESSID
!password='^`{cat    /lib/wpa/ESSID}   >   /mnt/factotum/ctl
aux/wpa	 -2  -s	 'ESSID'   /net/ether1	 ip/ipconfig   ether
/net/ether1

Replace	ESSID and make sure to store the  wifi	password  in
/lib/wpa/ESSID.	  For  wifi on Raspberry Pi boards, see	rpi-
wifi-p9.

Note:	You   also   want   to	 copy	these	 lines	  to
/cfg/$sysname/termrc  and  also	to run the command manually,
because	by default, plan 9 runs	as a  terminal	service.  It
will  not run as a cpu service until the cpu kernel has	been
compiled as described below.

Note: You *must* run ip/ipconfig before	running	ndb/dns	(and
possibly  other	 network services). Otherwise, you might see
errors like:

ndb/dns: can't read my ip address

term%	auth/wrkey   bad   authentication    password	 bad
authentication	id  bad	authentication domain authid: glenda
authdom: example.com auth password: secstore password:

Make sure to configure the auth	server,	see auth-p9.ms.

Build the cpu kernel:

% cd  /sys/src/9/bcm  %	 mk  'CONF=picpu'  %  dossrv;  mount
/srv/dos  /n/9fat  /dev/sdM0/dos  % cp /sys/src/9/bcm/9picpu
/n/9fat/

This guide was written for the Raspberry Pi Zero WH. You may
need to	replace	picpu with pi2cpu, or pi4cpu, depending	upon
your specific model.









			   - 2 -


Edit config.txt	to use the new kernel. For RPI Zero WH,	 the
[pi1] block should reads as follows:

[pi0] kernel=9picpu

Edit cmdline.txt to specify the	location of  nvram.  On	 RPI
Zero WH, cmdline.txt might read	as follows:

readparts=1    nobootprompt=local    console='0	    b115200'
ether1=type=4330 nvram='#S/sdM0/nvram' sysname=rpi

You will want to replace rpi with your desired sysname.

Make sure cmdline.txt is only one single line!

You may	need to	reboot so nvram	is detected correctly.

Now clear nvram	and then set a new password:

% echo garbage >/dev/sdM0/nvram

Set the	password:

term% auth/keyfs

Add the	hostowner pi to	sys and	adm groups:

term% con -Cl /srv/fscons prompt: uname	pi pi prompt:  uname
sys +pi	prompt:	uname adm +pi prompt: fsys main	main: create
/active/cron/bootes  bootes   bootes   d775   main:   create
/active/sys/log/cron bootes bootes a664

Append these lines to the bottom of /lib/ndb/auth:

hostid=pi
       uid=!sys	uid=!adm uid=*

You may	need to	reboot and login as  hostowner	(bootes)  in
order for the next step	to work.

When prompted, fill in the following values:

authid:	glenda authdom:	example.com auth password:  secstore
password:

Check that you are using the cpu kernel:

% echo $service	cpu

Change the hostowner's password:

term% auth/keyfs auth/changeuser glenda

If you are using 9front	drawterm  and  want  to	 connect  in









			   - 3 -


text-only mode (no graphics) with the -G flag, you will	need
to edit	$home/lib/profile to remove calls  to  rio.  Comment
out line 31:

#		exec rio

You can	run the	below command:

term% mv (/usr/$user/lib/)^(profile profile.bak)  term%	 sed
'31s/^/#/'	      /usr/$user/lib/profile.bak	   >
/usr/$user/lib/profile

Then afterwards, you will be able to connect  with  drawterm
-G as follow:

$ drawterm -u $USER -h $SYSNAME	-G

See also:

https://plan9.io/wiki/plan9/Configuring_a_Standalone_CPU_Server/index.html
https://9p.io/wiki/plan9/Drawterm_to_your_terminal/index.html
http://mirror.9grid.fr/mirror.9grid.fr/plan9-cpu-auth-
server-howto.html