[9fans] raspberry pi root filesystem via wifi

[Richard Miller <9fans@hamnavoe.com>]

> Have you ever tried taking root from a wifi connected server on a PI?

I was asked this question by email, but I'll reply on the list
in case others would like to know.

Yes, 9pi allows for this. You need a kernel built from configuration
/sys/src/9/bcm/pi2wifi (for Pi2 and Pi3) or /sys/src/9/bcm/pi4wifi
(for Pi4). Some configuration variables need to be defined at boot time,
either in cmdline.txt (see the sample cmdline-wifiroot.txt in the DOS
partition) or by responding to prompts (if you'd rather not store your
wifi password on the SD card).

The wifi configurations use /bin/rc as the boot process instead of
the normal boot program, with /sys/src/9/bcm/bootwifi.rc as a script.
Feel free to tinker with this script to adapt to your local setup.

The pi[24]wifi configurations are for a Plan 9 terminal. Adapting these
for a Pi cpu server taking root over wifi is left as an exercise for the
reader. (Hint: diff pi2 pi2cpu)


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